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Friday, March 6, 2015

Rome


From Wikipedia, the free encyclopedia

Rome
Roma
Comune
Roma Capitale
From top left clockwise: the Colosseum, the Monument to Vittorio Emanuele II, the Castel Sant'Angelo, an aerial view of the city's historic centre, the dome of St. Peter's Basilica, the Trevi Fountain, the Piazza della Repubblica.
From top left clockwise: the Colosseum, the Monument to Vittorio Emanuele II, the Castel Sant'Angelo, an aerial view of the city's historic centre, the dome of St. Peter's Basilica, the Trevi Fountain, the Piazza della Repubblica.
Flag of Rome
Flag
Official seal of Rome
Seal
Nickname(s): The Eternal City
The territory of the comune (Roma Capitale) inside the Metropolitan City of Rome
The territory of the comune (Roma Capitale) inside the Metropolitan City of Rome
Rome is located in Italy
Rome
Rome
Location in Italy
Coordinates: 41°54′N 12°30′E / 41.900°N 12.500°E / 41.900; 12.500Coordinates: 41°54′N 12°30′E / 41.900°N 12.500°E / 41.900; 12.500
Country  Italy
Region  Lazio
Government
 • Type Special Comune ("Roma Capitale")
 • Body Rome City Council
 • Mayor Ignazio Marino (PD)
Area
 • Total 1,285 km2 (496.3 sq mi)
Elevation 21 m (69 ft)
Population (2014)
 • Rank 1st, Italy
 • Density 2,232/km2 (5,781/sq mi)
 • Comune 2,869,461[1]
 • Metropolitan City 4,321,244[2]
Demonym Roman
Time zone CET (UTC+1)
CAP code(s) 00100; 00121 to 00199
Area code(s) 06
Website Comune di Roma

Rome (/ˈrm/, Italian: Roma [ˈroːma], Latin: Rōma) is a city and special comune (named "Roma Capitale") in Italy. Rome is the capital of Italy and region of Lazio. With 2.9 million residents in 1,285 km2 (496.1 sq mi), it is also the country's largest and most populated comune and fourth-most populous city in the European Union by population within city limits. The Metropolitan City of Rome has a population of 4.3 million residents.[2] The city is located in the central-western portion of the Italian Peninsula, within Lazio (Latium), along the shores of Tiber river. Vatican City is an independent country within the city boundaries of Rome, the only existing example of a country within a city: for this reason Rome has been often defined as capital of two states.[3][4]

Rome's history spans more than two and a half thousand years. Although Roman tradition states the founding of Rome around 753 BC, the site has been inhabited much earlier, being one of the oldest continuously occupied cities in Europe.[5] The city's early population originated from a mix of Latins, Etruscans and Sabines. Eventually, the city successively became the capital of the Roman Kingdom, the Roman Republic and the Roman Empire, and is regarded as one of the birthplaces of Western civilization. It is referred to as "Roma Aeterna" (The Eternal City) [6] and "Caput Mundi" (Capital of the World), two central notions in ancient Roman culture.

After the Fall of the Empire, which marked the beginning of the Middle Ages, Rome slowly fell under the political control of the Pope, which had settled in the city since the 1st century AD, until in the 8th century it became the capital of the Papal States, which lasted until 1870.

Beginning with the Renaissance, almost all the popes since Nicholas V (1422–55) pursued coherently along four hundred years an architectonic and urbanistic program aimed to make of the city the world's artistic and cultural center.[7] Due to that, Rome became first one of the major centers of the Italian Renaissance,[8] and then the birthplace of the Baroque style. Famous artists and architects of the Renaissance and Baroque period made Rome the center of their activity, creating masterpieces throughout the city. In 1871 Rome became the capital of the Kingdom of Italy, and in 1946 that of the Italian Republic.

Rome has the status of a global city.[9][10][11] In 2011, Rome was the 18th-most-visited city in the world, 3rd most visited in the European Union, and the most popular tourist attraction in Italy.[12] Its historic centre is listed by UNESCO as a World Heritage Site.[13] Monuments and museums such as the Vatican Museums and the Colosseum are among the world's most visited tourist destinations with both locations receiving millions of tourists a year. Rome hosted the 1960 Summer Olympics and is the seat of United Nations' Food and Agriculture Organization (FAO).

Etymology

About the origin of the name Roma several hypotheses have been advanced.[14] The most important are the following:

History

Earliest history

There is archaeological evidence of human occupation of the Rome area from approximately 14,000 years ago, but the dense layer of much younger debris obscures Palaeolithic and Neolithic sites.[5] Evidence of stone tools, pottery and stone weapons attest to about 10,000 years of human presence. Several excavations support the view that Rome grew from pastoral settlements on the Palatine Hill built above the area of the future Roman Forum. While some archaeologists argue that Rome was indeed founded in the middle of the 8th century BC (the date of the tradition), the date is subject to controversy.[17] However, the power of the well known tale of Rome's legendary foundation tends to deflect attention from its actual, and much more ancient, origins.

Legend of the founding of Rome


Capitoline Wolf suckles the infant twins Romulus and Remus.

Traditional stories handed down by the ancient Romans themselves explain the earliest history of their city in terms of legend and myth. The most familiar of these myths, and perhaps the most famous of all Roman myths, is the story of Romulus and Remus, the twins who were suckled by a she-wolf.[18] They decided to build a city, but after an argument, Romulus killed his brother. According to the Roman annalists, this happened on 21 April 753 BC.[19] This legend had to be reconciled with a dual tradition, set earlier in time, that had the Trojan refugee Aeneas escape to Italy and found the line of Romans through his son Iulus, the namesake of the Julio-Claudian dynasty.[20] This was accomplished by the Roman poet Virgil in the first century BC.

Monarchy, republic, empire

After the legendary foundation by Romulus,[19] Rome was ruled for a period of 244 years by a monarchical system, initially with sovereigns of Latin and Sabine origin, later by Etruscan kings. The tradition handed down seven kings: Romulus, Numa Pompilius, Tullus Hostilius, Ancus Marcius, Tarquinius Priscus, Servius Tullius and Tarquin the Proud.[19]
In 509 BC the Romans expelled from the city the last king and established an oligarchic republic: since then, for Rome began a period characterized by internal struggles between patricians (aristocrats) and plebeians (small landowners), and by constant warfare against the populations of central Italy: Etruscans, Latins, Volsci, Aequi.[21] After becoming master of Latium, Rome led several wars (against the Gauls, Osci-Samnites and the Greek colony of Taranto, allied with Pyrrhus, king of Epirus) whose result was the conquest of the Italian peninsula, from the central area up to Magna Graecia.[22]

The third and second century BC saw the establishment of the Roman hegemony over the Mediterranean and the East, through the three Punic Wars (264-146 BC) fought against the city of Carthage and the three Macedonian Wars (212-168 BC) against Macedonia.[23] Then were established the first Roman provinces: Sicily, Sardinia and Corsica, Spain, Macedonia, Greece (Achaia), Africa.[24]

Map depicting late ancient Rome.

From the beginning of the 2nd century BC, the power was contended between two groups of aristocrats: the optimates, representing the conservative part of the Senate, and the populares, which relied on the help of the urban populace to gain the power. In the same period, the bankruptcy of the small farmers and the establishment of large slave estates provoked the migration to the city of a large number of people. The continuous warfare made necessary a professional army, which was more loyal to its chiefs than to the republic. Due to that, in the second half of the second century and during the first century BC saw fights abroad and at home: after the failed attempt of social reform of Tiberius and Gaius Gracchus,[25] and the war against Jugurtha,[25] there was a first civil war between Gaius Marius and Sulla.[25] To this followed the slave revolt under Spartacus,[26] and the establishment of a first Triumvirate with Caesar, Pompey and Crassus.[26]

The conquest of Gaul let rise the star of Caesar, who fought a second civil war against the Senate and Pompey and, after his victory, established a lifelong dictatorship.[26] His assassination led to a second Triumvirate among Octavian (Caesar's nephew and heir), Mark Antony and Lepidus, and to another civil war between the Octavian and Antony.[27] The former in 27 BC became princeps civitatis and got the title of Augustus, founding the principate, a diarchy between the princeps and the senate.[27] Established de facto the empire, which reached its greatest expansion in the second century under the Emperor Trajan, Rome was confirmed as caput Mundi, i.e. the capital of the world, an expression which had already been given in the Republican period. During its first two centuries the empire saw as rulers, after Octavian Augustus, the emperors of the Julio-Claudian,[28] Flavian (who also built eponymous amphitheater, known as the Colosseum)[28] and Antonine dynasties.[29] This time was also characterized by the spread of the Christian religion, preached by Jesus Christ in Judea in the first half of the century (under Tiberius) and popularized by his apostles through the empire.[30] The Antonine age is considered the apogee of the Empire, whose territory ranged from the Atlantic Ocean to the Euphrates, from the central-northern part of Britain to Egypt.[29]

The Roman Empire at its greatest extent controlled approximately 6.5 million square kilometres[31] of land surface.

In the third century, at the end of the Antonine dynasty, with the Severan dynasty the principatus was substituted by a military government, which was soon followed by a period of military anarchy, while the economy deteriorated, the inflation rose and the historical enemies of Rome, the Germanic tribes in the West and the Persian Empire in the East, bore a continue pressure on the frontiers.[32]

Emperor Diocletian (284) fought the economic and military problems introducing the dominate, an absolute monarchy where the emperor was deified, imposing the price control and decentralising the administration: the emperor divided the empire into twelve dioceses, ruling under the title of Augustus the eastern half (with residence in Nicomedia) and naming Maximian Augustus of the western half, whose capital was moved to Mediolanum.[32] The succession was regulated with the creation of the Tetrarchy: each Augustus, in fact, had to appoint a junior emperor, named Caesar, which would rule part of the roman territory on behalf of his Augustus and which would become, at the end, the new emperor.[32]

After the abdication of Diocletian and Maximian in 305 and many dynastic fights, this system collapsed, and the new ruler, Constantine, centralized power again and, with the Edict of Milan in 313, gave freedom of worship for Christians, pledging himself to give stability to the new religion. He built several churches, gave the civil power of Rome to Pope Sylvester I and founded in the eastern part the new capital, Constantinople.[33]

Christianity became the official religion of the empire, thanks to an edict issued in 380 by Theodosius, who was the last emperor of a unified empire: after his death, in fact, his sons, Arcadius and Honorius, divided the empire in a western and an eastern part. The capital of the western Roman Empire became Ravenna.[33]

Rome, which had lost its central role in the administration of the empire, was sacked in 410 by the Visigoths led by Alaric I,[34] but also embellished by the construction of sacred buildings by the popes (with the collaboration of the emperors). The city, impoverished and depopulated, suffered a new looting in 455, by Genseric, king of the Vandals.[35] The weak emperors of the fifth century could not stop the decay, until the deposition of Romulus Augustus on 22 August 476 marked the end of the Western Roman Empire and, for many historians, the beginning of the Middle Ages.[33]

Middle Ages


15th-century miniature depicting the Sack of Rome (410)

The Bishop of Rome, called the Pope, was important since the early days of Christianity because of the martyrdom of both the apostles Peter and Paul there. The Bishops of Rome were also seen (and still are seen by the Catholics) as the successors of Peter, he being the first Bishop of Rome. The city thus became of increasing importance in the Catholic Church. After the fall of the Western Roman Empire in 476 AD, Rome was first under the control of Odoacer and then became part of the Ostrogothic Kingdom before returning to East Roman control after the Gothic War, which devastated the city. Its population declined from more than a million in 210 AD to 500,000 in 273[36] to 35,000 after the Gothic War,[37] reducing the sprawling city to groups of inhabited buildings interspersed among large areas of ruins, vegetation, vineyards and market gardens.[38]

After the Lombard invasion of Italy, the city remained nominally Byzantine, but in reality the popes pursued a policy of equilibrium between the Byzantines, the Franks and the Lombards.[39] In 729, the Lombard king Liutprand donated to the church the north Latium town of Sutri, starting the temporal power of the church.[39] In 756, Pepin the Short, after having defeated the Lombards, gave to the Pope temporal jurisdiction over the Roman Duchy and the Exarchate of Ravenna, thus creating the Papal States.[39] Since this period three powers tried to rule the city: the pope, the nobility, together with the chefs of militias, the judges, the Senate and the populace; and the Frankish king, as king of the Lombards, patricius and Emperor.[39] These three parties (theocratic, republican and imperial) were a characteristic of the roman life during the whole Middle Ages.[39] On the Christmas night of 800, Charlemagne was crowned in Rome first emperor of the Holy Roman Empire by Pope Leo III: in that occasion the city hosted for the first time the two powers whose struggle for the universal power had to be a constant of the Middle Ages.[39]

Crowning of Charlemagne in Old Saint Peter's Basilica, on 25 December 800

In 846, Muslim Arabs unsuccessfully stormed the city's walls, but managed to loot St. Peter's and St. Paul's basilica, both outside the city wall.[40] After the decay of Carolingian power, Rome fell prey of the feudal anarchy: several noble families keep fighting against the pope, the emperor and each other. These were the fishy times of Theodora and her daughter Marozia, concubines and mothers of several popes, and of Crescentius, a powerful feudal lord, who fought against the emperors Otto II and III.[41] The scandals of this period pushed the papacy to reform itself: the election of the pope was reserved to the cardinals, and a reform of the clergy was attempted: but the driving force behind this renewal, monk Ildebrando da Soana, once elected pope under the name of Gregory VII, got involved into the Investiture Controversy against Emperor Henry IV.[41] In that occasion Rome was sacked and burned by the Normans of Robert Guiscard, rushed to the Pope`s aid, who was besieged in Castel S. Angelo.[41]

During this period, the city was autonomously ruled by a senatore or patrizio: in the 12th century, this administration, as often in the Italian cities, evolved into the commune, a new form of social organisation, expression of the new wealthy classes.[41] Pope Lucius II had already to fight against the roman commune, and the struggle was continued by his successor pope Eugenius III: then the commune, allied with the nobility, was supported by Arnaldo da Brescia, a monk who was a religious and social reformer.[42] After the pope's death, Arnaldo was taken prisoned by Adrianus IV, and this marked the end of the comune's autonomy.[42] Under pope Innocent III, whose reign marked the apogee of the papacy, the commune liquidated the senate, and replaced it with a Senatore, who was subject to the pope.[42]

In this period the papacy played a role of secular importance in Western Europe, often acting as arbitrators between Christian monarchs and exercising additional political powers.[43][44][45]
In 1266, Senator was appointed Charles of Anjou, who was heading south to fight the Hohenstaufen on behalf of the pope. Charles founded the Sapienza, the university of Rome.[42] In that period the pope died, and the cardinals, summoned in Viterbo, could not agree about his successor: the people of the city, got angry about that, unroofed the building where they had met, imprisoning them until they had nominated the new pope: this happening marked the birth of the conclave.[42] In this period the city was also shattered by continuous fights among the noble families: Annibaldi, Caetani, Colonna, Orsini, Conti, nested in their fortresses built above ancient Roman edifices, fought each other trying to hold hands on the papacy.[42]

Pope Boniface VIII, born Caetani, was the last pope to fight for the church's universal domain: he proclaimed a crusade against the Colonna, and in 1300 he called for the first Jubilee of Christianity, which brought to Rome millions of pilgrims.[42] However his hopes were crushed against the French king Philip the Fair, who let him taken prisoner and slashed in Anagni, causing his death.[42] Afterwards, a new pope faithful to the French was elected, and the papacy was briefly relocated to Avignon (1309–1377).[46] During this period the city was neglected, until the power fell in the hand of a plebeian man, Cola di Rienzo.[46] An idealist and a lover of ancient Rome, Cola dreamed about a ribirth of the Roman Empire: after assuming the power with the title of Tribuno, his reforms were rejected by the populace.[46] Forced to flee, Cola could come back among the suite of cardinal Albornoz, in charge of restoring the church power in Italy.[46] Back in power for a short time, he was lynched by the populace, and Albornoz could take possession of the city, that in 1377 under Gregory XI became again the seat of the papacy.[46] The return of the pope to Rome in that year unleashed the western Schism (1377-1418), and during the next forty years, the city was prey of the fights which shattered the church.[46]

Early modern

The Tempietto (San Pietro in Montorio), which is an excellent example of Italian Renaissance architecture

In 1418, the Council of Constance settled the western schism, and a Roman pope, Martin V, was elected.[46] This brought to Rome a century of internal peace, which marked the beginning of the Renaissance.[46] The ruling popes until the first half of the 16th century, from Nicholas V, founder of the Vatican Library, to Pius II, humanist and literate, from Sixtus IV, a warrior pope, to Alexander VI, immoral and nepotist, from Julius II, soldier and patron, to Leo X, who gave his name to this period ("the century of Leo X"), all devoted their energy to the greatness and the beauty of the eternal city, to the power of their stock, and to the patronage of the arts.[46] During those years the center of the Italian Renaissance moved to Rome from Florence. Majestic works, as the new Saint Peter's Basilica, the Sistine Chapel and Ponte Sisto (the first bridge to be built across the Tiber since antiquity, although on Roman foundation) were created. To accomplish that the Popes engaged the best artists of the time, including Michelangelo, Perugino, Raphael, Ghirlandaio, Luca Signorelli, Botticelli, and Cosimo Rosselli. The period was also infamous for papal corruption, with many Popes fathering children, and engaging in nepotism and simony. The corruption of the Popes and the huge expenses for their building projects led, in part, to the Reformation and, in turn, the Counter-Reformation. Popes, such as Alexander VI, were well known for their decadence, wild parties, extravagance and immoral lives.[47] However, under these extravagant and rich popes, Rome was transformed into a centre of art, poetry, music, literature, education and culture. Rome became able to compete with other major European cities of the time in terms of wealth, grandeur, the arts, learning and architecture. The Renaissance period changed Rome's face dramatically, with works like the Pietà by Michelangelo and the frescoes of the Borgia Apartment, all made during Innocent's reign. Rome reached the highest point of splendour under Pope Julius II (1503–1513) and his successors Leo X and Clement VII, both members of the Medici family.

In this twenty-year period, Rome became one of the greatest centres of art in the world. The old St. Peter's Basilica built by Emperor Constantine the Great[48] (which by then was in a dilapidated state) was demolished and a new one begun. The city hosted artists like Ghirlandaio, Perugino, Botticelli and Bramante, who built the temple of San Pietro in Montorio and planned a great project to renovate the Vatican. Raphael, who in Rome became one of the most famous painters of Italy, created frescoes in the Villa Farnesina, the Raphael's Rooms, plus many other famous paintings. Michelangelo started the decoration of the ceiling of the Sistine Chapel and executed the famous statue of the Moses for the tomb of Julius II. Rome lost in part its religious character, becoming increasingly a true Renaissance city, with a great number of popular feasts, horse races, parties, intrigues and licentious episodes.

Michelangelo's ceiling in the Sistine Chapel.

Its economy was rich, with the presence of several Tuscan bankers, including Agostino Chigi, who was a friend of Raphael and a patron of arts. Before his early death, Raphael also promoted for the first time the preservation of the ancient ruins. The fight between France and Spain in Europe caused the first plunder of the city in more than one thousand years. In 1527, the Landsknechts of Emperor Charles V sacked the city, putting to an abrupt end the golden age of the Renaissance in Rome.[46]

Beginning with the Council of Trent in 1545, the Church began the Counter-Reformation as an answer to the Reformation, a large-scale questioning of the Church's authority on spiritual matters and governmental affairs. (This loss of confidence then led to major shifts of power away from the Church.)[46] Under the popes from Pius IV to Sixtus V, Rome became the centre of the reformed Catholicism and saw the installment of new monuments which celebrated the papacy's restored greatness.[49] The popes and cardinals of the 17th and early 18th centuries continued the movement by having city's landscape enriched with baroque buildings.[49]

Rome in 1642

This was another nepotistic age: the new noble families (Barberini, Pamphili, Chigi, Rospigliosi, Altieri, Odescalchi) were protected by their respective popes, who built for their relatives huge baroque buildings.[49] During the Age of Enlightenment, new ideas reached also the Eternal City, where the papacy supported archaeological studies and improved the people's welfare.[46] But not everything went well for the Church during the Counter-Reformation. There were setbacks in the attempts to restrain the anti-Church policies of European powers of the time, the most notable setback perhaps being in 1773 when Pope Clement XIV was forced by secular powers to have the Jesuit order suppressed.[46]

Late modern and contemporary

The rule of the Popes was interrupted by the short-lived Roman Republic (1798–1800), which was built under the influence of the French Revolution. The Papal States were restored in June 1800, but during Napoleon's reign Rome was annexed as a Département of the French Empire: first as Département du Tibre (1808–10) and then as Département Rome (1810–14). After the fall of Napoleon, the Church State under the pope was reinstated through the Congress of Vienna of 1814.

In 1849 another Roman Republic arose within the framework of the revolutions of 1848. Two of the most influential figures of the Italian unification, Giuseppe Mazzini and Giuseppe Garibaldi, fought for the short-lived republic.

Italian soldiers enter Rome on 20 September 1870.

Rome then became the focus of hopes of Italian reunification, as the rest of Italy was reunited as the Kingdom of Italy, with a temporary capital at Florence. In 1861 Rome was declared capital of Italy even though it was still under the control of the Pope. During the 1860s, the last vestiges of the Papal States were under French protection, thanks to the foreign policy of Napoleon III. And it was only when this was lifted in 1870, owing to the outbreak of the Franco-Prussian War, that Italian troops were able to capture Rome entering the city through a breach near Porta Pia. Afterwards, Pope Pius IX declared himself as prisoner in the Vatican, and in 1871 the capital of Italy was finally moved from Florence to Rome.[50]

Soon after World War I, Rome witnessed the rise to power of Italian Fascism, led by Benito Mussolini, who marched on the city in 1922, eventually declaring a new Italian Empire and allying Italy with Nazi Germany. Mussolini let pull down large parts of the city center in order to build wide avenues and squares which were supposed to celebrate the fascist regime and the resurgence of classical Rome.[51] The interwar period saw a rapid growth in the city's population, which surpassed one million inhabitants. In World War II, due to its art treasuries and the presence of Vatican, Rome largely escaped the tragic destiny of other European cities. However, on 19 July 1943 the San Lorenzo district was bombed by Anglo-American forces, resulting in about 3,000 deaths and 11,000 wounded. After the fall of Mussolini and the Italian Armistice on 8 September 1943, the city was occupied by the Germans and declared an open city until its liberation on 4 June 1944.

Rome developed momentously after the war, as one of the driving forces behind the "Italian economic miracle" of post-war reconstruction and modernisation in the 1950s and early 1960s. During this period, the years of la dolce vita ("the sweet life"), Rome became a fashionable city, with popular classic films such as Ben Hur, Quo Vadis, Roman Holiday and La Dolce Vita filmed in the city's iconic Cinecittà film studios. The rising trend in population growth continued until the mid-1980s, when the comune had more than 2.8 million residents; after that, population started to decline slowly as inhabitants began to move to nearby suburbs of Rome.

Government

Local government


Palazzo Senatorio, Rome City Hall

Rome constitutes a comune speciale, named "Roma Capitale",[52] and is the largest both in terms of land area and population among the 8,101 comuni of Italy. It is governed by a mayor, currently Ignazio Marino, and a city council. The seat of the comune is the Palazzo Senatorio on the Capitoline Hill, the historic seat of the city government. The local administration in Rome is commonly referred to as "Campidoglio", the Italian name of the hill.

Administrative and historical subdivisions


The municipi of Rome.

Since 1972 the city has been divided into administrative areas, called municipi (sing. municipio) (until 2001 named circoscrizioni).[53] They were created for administrative reasons to increase decentralisation in the city. Each municipio is governed by a president and a council of four members who are elected by its residents every five years. The municipi frequently cross the boundaries of the traditional, non-administrative divisions of the city.

The municipi where originally 20, then 19.[54] In 2013 their number has been reduced to 15.[55]
Rome is also divided into differing types of non-administrative units. The historic centre is divided into 22 rioni, all of which are located within the Aurelian Walls except Prati and Borgo.

These originate from the Regiones of ancient Rome, which evolved in the Middle Ages into the medieval rioni.[56] In the Renaissance, under Pope Sixtus V, they reached again the number of fourteen, and their boundaries were finally defined under Pope Benedict XIV in 1743.

A new subdivision of the city under Napoleon was ephemeral, and there were no sensible changes in the organisation of the city until 1870, when Rome became the third capital of Italy. The needs of the new capital led to an explosion both in the urbanisation and in the population within and outside the Aurelian walls. In 1874 a fifteenth rione, Esquilino, was created on the newly urbanised zone of Monti. At the beginning of the 20th century other rioni where created (the last one was Prati – the only one outside the Walls of Pope Urban VIII – in 1921). Afterward, for the new administrative subdivisions of the city the name "quartiere" was used. Today all the rioni are part of the first Municipio, which therefore coincides completely with the historical city (Centro Storico).

Metropolitan and regional government

Rome is the principal town of the Metropolitan City of Rome, operative since 1 January 2015. The Metropolitan City replaced the old province, which included the city's metropolitan area and extends further north until Civitavecchia. The Metropolitan City of Rome is the largest by area in Italy. At 5,352 square kilometres (2,066 sq mi), its dimensions are comparable to the region of Liguria. Moreover, the city is also the capital of the Lazio region.

National government

Rome is the national capital of Italy and is the seat of the Italian Government. The official residences of the President of the Italian Republic and the Italian Prime Minister, the seats of both houses of the Italian Parliament and that of the Italian Constitutional Court are located in the historic centre. The state ministries are spread out around the city; these include the Ministry of Foreign Affairs, which is located in Palazzo della Farnesina near the Olympic stadium.

Geography


Astronaut view of Rome, 2002

Location

Rome is in the Lazio region of central Italy on the Tiber river (Italian: Tevere). The original settlement developed on hills that faced onto a ford beside the Tiber Island, the only natural ford of the river in this area. The Rome of the Kings was built on seven hills: the Aventine Hill, the Caelian Hill, the Capitoline Hill, the Esquiline Hill, the Palatine Hill, the Quirinal Hill, and the Viminal Hill. Modern Rome is also crossed by another river, the Aniene, which flows into the Tiber north of the historic centre.

Although the city centre is about 24 kilometres (15 mi) inland from the Tyrrhenian Sea, the city territory extends to the shore, where the south-western district of Ostia is located. The altitude of the central part of Rome ranges from 13 metres (43 ft) above sea level (at the base of the Pantheon) to 139 metres (456 ft) above sea level (the peak of Monte Mario).[57] The Comune of Rome covers an overall area of about 1,285 square kilometres (496 sq mi), including many green areas.

Topography


Rome seen from satellite.

Throughout the history of Rome, the urban limits of the city were considered to be the area within the city walls. Originally, these consisted of the Servian Wall, which was built twelve years after the Gaulish sack of the city in 390 BC. This contained most of the Esquiline and Caelian hills, as well as the whole of the other five. Rome outgrew the Servian Wall, but no more walls were constructed until almost 700 years later, when, in 270 AD, Emperor Aurelian began building the Aurelian Walls. These were almost 19 kilometres (12 mi) long, and were still the walls the troops of the Kingdom of Italy had to breach to enter the city in 1870. The city's urban area is cut in two by its ring-road, the Grande Raccordo Anulare ("GRA"), finished in 1962, which circles the city centre at a distance of about 10 km (6 mi). Although when the ring was completed most part of the inhabited area lay inside it (one of the few exceptions was the former village of Ostia, which lies along the tyrrhenian coast), in the meantime quarters have been built which extend up to 20 km (12 mi) beyond it.

The comune covers an area roughly three times the total area within the Raccordo and is comparable in area to the entire metropolitan cities of Milan and Naples, and to an area six times the size of the territory of these cities. It also includes considerable areas of abandoned marsh land which is suitable neither for agriculture nor for urban development.

As a consequence, the density of the comune is not that high, its territory being divided between highly urbanised areas and areas designated as parks, nature reserves, and for agricultural use.

Climate

Rome enjoys a Mediterranean climate (Köppen climate classification: Csa),[58] with cool, humid winters and hot, dry summers.
Its average annual temperature is above 20 °C (68 °F) during the day and 10 °C (50 °F) at night. In the coldest month – January, the average temperature is 12 °C (54 °F) during the day and 3 °C (37 °F) at night. In the warmest months – July and August, the average temperature is 30 °C (86 °F) during the day and 18 °C (64 °F) at night.

December, January and February are the coldest months, with average temperatures around 12.5 °C (54.5 °F) during the day and 3.6 °C (38.5 °F) at night. Temperatures generally vary between 10 and 15 °C (50 and 59 °F) during the day and between 3 and 5 °C (37 and 41 °F) at night, with colder or warmer spells occurring frequently. Snowfall is rare but not unheard of, with light snow or flurries occurring almost every winter, generally without accumulation, and major snowfalls once every 20 or 25 years (the last one in 2012).[59]

The average relative humidity is 75%, varying from 72% in July to 77% in November. Sea temperatures vary from a low of 13 °C (55 °F) in February and March to a high of 24 °C (75 °F) in August.[60]

Climate data for Rome Ciampino Airport (altitude: 105 m sl, 13 km south-east from Colosseum satellite view)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °C (°F) 11.9
(53.4)
13.0
(55.4)
15.2
(59.4)
17.7
(63.9)
22.8
(73)
26.9
(80.4)
30.3
(86.5)
30.6
(87.1)
26.5
(79.7)
21.4
(70.5)
15.9
(60.6)
12.6
(54.7)
20.4
(68.7)
Daily mean °C (°F) 7.5
(45.5)
8.2
(46.8)
10.2
(50.4)
12.6
(54.7)
17.2
(63)
21.1
(70)
24.1
(75.4)
24.5
(76.1)
20.8
(69.4)
16.4
(61.5)
11.4
(52.5)
8.4
(47.1)
15.2
(59.4)
Average low °C (°F) 3.1
(37.6)
3.5
(38.3)
5.2
(41.4)
7.5
(45.5)
11.6
(52.9)
15.3
(59.5)
18.0
(64.4)
18.3
(64.9)
15.2
(59.4)
11.3
(52.3)
6.9
(44.4)
4.2
(39.6)
10.0
(50)
Precipitation mm (inches) 66.9
(2.634)
73.3
(2.886)
57.8
(2.276)
80.5
(3.169)
52.8
(2.079)
34.0
(1.339)
19.2
(0.756)
36.8
(1.449)
73.3
(2.886)
113.3
(4.461)
115.4
(4.543)
81.0
(3.189)
804.3
(31.665)
Avg. precipitation days (≥ 1 mm) 7.0 7.6 7.6 9.2 6.2 4.3 2.1 3.3 6.2 8.2 9.7 8.0 79.4
Mean monthly sunshine hours 120.9 132.8 167.4 201.0 263.5 285.0 331.7 297.6 237.0 195.3 129.0 111.6 2,472.8
Source: Servizio Meteorologico,[61] data of sunshine hours[62]

Demographics

In 550 BC Rome was the second largest city in Italy, with Tarentum being the largest. It had an area of about 285 hectares (1.1 sq mile) and an estimated population of 35,000. Other sources suggest the population was just under 100,000 from 600–500 BC.[65][66]
When the Republic was founded in 509 BC the census recorded a population of 130,000. The republic included the city itself and the immediate surroundings. Other sources suggest a population of 150,000 in 500 BC. It surpassed 300,000 in 150 BC.[67][68][69][70][71]

At the time of the Emperor Augustus, Rome was the largest city in the world: with a population of about one million people (about the size of London in the early 19th century, when London was the largest city in the world).[72][73][74][75]

After the fall of the Western Roman Empire, the city's population declined to less than 50,000 people. It continued to stagnate or shrink until the Renaissance.[76] When the Kingdom of Italy annexed Rome in 1870, the city had a population of about 200,000. This increased to 600,000 by the eve of World War I. The Fascist regime of Mussolini tried to block an excessive demographic rise of the city, but failed to prevent it from reaching one million people by the early 1930s.[citation needed][clarification needed] After the Second World War, growth continued, helped by a post-war economic boom. A construction boom also created a large number of suburbs during the 1950s and 1960s.

In mid-2010, there were 2,754,440 residents in the city proper, while some 4.2 million people lived in the greater Rome area (which can be approximately identified with its administrative metropolitan city, with a population density of about 800inhab./km2 stretching over more than 5,000 km²). Minors (children ages 18 and younger) totalled 17.00 percent of the population compared to pensioners who number 20.76 percent. This compares with the Italian average of 18.06 percent (minors) and 19.94 percent (pensioners). The average age of a Roman resident is 43 compared to the Italian average of 42. In the five years between 2002 and 2007, the population of Rome grew by 6.54 percent, while Italy as a whole grew by 3.56 percent.[77] The current birth rate of Rome is 9.10 births per 1,000 inhabitants compared to the Italian average of 9.45 births.

The urban area of Rome extends beyond the administrative city limits with a population of around 3.9 million.[78] Between 3.2 and 4.2 million people live in the Rome metropolitan area.[79][80][81][82][83]

Ethnic groups

According to the latest statistics conducted by ISTAT,[84] approximately 9.5% of the population consists of non-Italians. About half of the immigrant population consists of those of various other European origins (chiefly Romanian, Polish, Ukrainian, and Albanian) numbering a combined total of 131,118 or 4.7 percent of the population. The remaining 4.8 percent are those with non-European origins, chiefly Filipinos (26,933), Bangladeshis (12,154), and Chinese (10,283).

The Esquilino rione, off Termini Railway Station, has evolved into a largely immigrant neighbourhood. It is perceived as Rome's Chinatown. Immigrants from more than a hundred different countries reside there. A commercial district, Esquilino contains restaurants featuring many kinds of international cuisine. There are wholesale clothes shops. Of the 1,300 or so commercial premises operating in the district 800 are Chinese-owned; around 300 are run by immigrants from other countries around the world; 200 are owned by Italians.[85]

Religion


Much like the rest of Italy, Rome is predominantly Roman Catholic, and the city has been an important centre of religion and pilgrimage for centuries, the base of the ancient Roman Religion with the pontifex maximus and later the seat of the Vatican and the pope. Before the arrival of the Christians in Rome, the Religio Romana (literally, the "Roman Religion") was the major religion of the city in classical antiquity. The first gods held sacred by the Romans were Jupiter, the most high, and Mars, god of war, and father of Rome's twin founders, Romulus and Remus, according to tradition. Other gods and goddesses such as Vesta and Minerva were honoured. Rome was also the base of several mystery cults, such as Mithraism. Later, after St Peter and St Paul were martyred in the city, and the first Christians began to arrive, Rome became Christian, and the Old St. Peter's Basilica was constructed in 313 AD. Despite some interruptions (such as the Avignon papacy), Rome has for centuries been the home of the Roman Catholic Church and the Bishop of Rome, otherwise known as the Pope.

Despite the fact that Rome is home to the Vatican City and St. Peter's Basilica, Rome's cathedral is the Basilica of St. John Lateran, located to the south-east of the city-centre. There are around 900 churches in Rome in total, aside from the cathedral itself, some others of note include: the Basilica di Santa Maria Maggiore, the Basilica of Saint Paul Outside the Walls, the Basilica di San Clemente, San Carlo alle Quattro Fontane and the Church of the Gesu. There are also the ancient Catacombs of Rome underneath the city. Numerous highly important religious educational institutions are also in Rome, such as the Pontifical Lateran University, Pontifical Biblical Institute, Pontifical Gregorian University, and Pontifical Oriental Institute.

Mosque of Rome, the largest mosque in Europe.

In recent years, there has been a significant growth in Rome's Muslim community, mainly due to immigration from North African and Middle Eastern countries into the city. As a result of this increase of the local practitioners of the Islamic faith, the comune promoted the building of the Mosque of Rome, which is the largest mosque in Europe, that was designed by architect Paolo Portoghesi and inaugurated on 21 June 1995. Since the end of the Roman Republic, Rome is also the center of an important Jewish community,[86] which was once based in Trastevere, and later in the Roman Ghetto. There lies also the major synagogue in Rome, the Tempio Maggiore.

Vatican City

Panorama of St. Peter's Square
St. Peter's Square in Vatican City.

The territory of Vatican City is part of the Mons Vaticanus (Vatican Hill), and of the adjacent former Vatican Fields, where St. Peter's Basilica, the Apostolic Palace, the Sistine Chapel, and museums were built, along with various other buildings. The area was part of the Roman rione of Borgo until 1929. Being separated from the city on the west bank of the Tiber river, the area was an suburb that was protected by being included within the walls of Leo IV, later expanded by the current fortification walls of Paul III/Pius IV/Urban VIII.

When the Lateran Treaty of 1929 that created the Vatican state was being prepared, the boundaries of the proposed territory were influenced by the fact that much of it was all but enclosed by this loop. For some tracts of the frontier, there was no wall, but the line of certain buildings supplied part of the boundary, and for a small part of the frontier a modern wall was constructed.

The territory includes Saint Peter's Square, separated from the territory of Italy only by a white line along the limit of the square, where it borders Piazza Pio XII. St. Peter's Square is reached through the Via della Conciliazione, which runs from the Tiber River to St. Peter's. This grand approach was designed by architects Piacentini and Spaccarelli, for want of Benito Mussolini and in accordance with the church, after the conclusion of the Lateran Treaty. According to the Lateran Treaty, certain properties of the Holy See located in Italian territory, most notably the Papal Palace of Castel Gandolfo and the major basilicas, enjoy extraterritorial status similar to that of foreign embassies.

Pilgrimage

Rome has been a major Christian pilgrimage site since the Middle Ages. People from all over the Christian world visit Vatican City, within the city of Rome, the seat of the papacy. The Pope was the most influential figure during the Middle Ages. The city became a major pilgrimage site during the Middle Ages and the focus of struggles between the Papacy and the Holy Roman Empire starting with Charlemagne, who was crowned its first emperor in Rome in 800 by Pope Leo III. Apart from brief periods as an independent city during the Middle Ages, Rome kept its status as Papal capital and "holy city" for centuries, even when the Papacy briefly relocated to Avignon (1309–1377). Catholics believe that the Vatican is the last resting place of St. Peter.

Pilgrimages to Rome can involve visits to a large number of sites, both within the Vatican City and in Italian territory. A popular stopping point is the Pilate's stairs: these are, according to the Christian tradition, the steps that led up to the praetorium of Pontius Pilate in Jerusalem, which Jesus Christ stood on during his Passion on his way to trial.[87] The stairs were, reputedly, brought to Rome by St. Helena in the 4th Century. For centuries, the Scala Santa has attracted Christian pilgrims who wished to honor the Passion of Jesus. Object of pilgrimage are also several catacombs built in the Roman age, in which Christians prayed, buried their dead and performed worship during periods of persecution, and various national churches (among them San Luigi dei francesi and Santa Maria dell'Anima), or churches associated with individual religious orders, such as the Jesuit Churches of Jesus and Sant`Ignazio.

Traditionally, pilgrims in Rome and Roman citizens thanking God for a grace should visit by foot the seven pilgrim churches (Italian: Le sette chiese) in 24 hours. This custom, mandatory for each pilgrim in the Middle Ages, was codified in the 16th century by Saint Philip Neri. The seven churches are the four major Basilicas (St Peter in Vatican, St Paul outside the Walls, St John in Lateran and Santa Maria Maggiore), while the other three are San Lorenzo fuori le mura (a paleochristian Basilica), Santa Croce in Gerusalemme (a church founded by Helena, the mother of Constantine, which hosts fragments of wood attributed to the holy cross) and San Sebastiano fuori le mura (which lies on the Appian Way and is built above Roman catacombs).

Cityscape


Architecture

The Pantheon.

Rome's architecture over the centuries has greatly developed, especially from the Classical and Imperial Roman styles to modern Fascist architecture. Rome was for a period one of the world's main epicentres of classical architecture, developing new forms such as the arch, the dome and the vault.[88] The Romanesque style in the 11th, 12th and 13th centuries was also widely used in Roman architecture, and later the city became one of the main centres of Renaissance and Baroque architecture.[88]

Ancient Rome


One of the symbols of Rome is the Colosseum (70–80 AD), the largest amphitheatre ever built in the Roman Empire. Originally capable of seating 60,000 spectators, it was used for gladiatorial combat. A list of important monuments and sites of ancient Rome includes the Roman Forum, the Domus Aurea, the Pantheon, Trajan's Column, Trajan's Market, the Catacombs, the Circus Maximus, the Baths of Caracalla, Castel Sant'Angelo, the Mausoleum of Augustus, the Ara Pacis, the Arch of Constantine, the Pyramid of Cestius, and the Bocca della Verità.

Medieval

Often overlooked, Rome's medieval heritage is one of the largest in Italian cities. Basilicas dating from the Paleochristian age include Santa Maria Maggiore and San Paolo Fuori le Mura (the latter largely rebuilt in the 19th century), both housing precious 4th century AD mosaics. Later notable medieval mosaic and fresco art can be also found in the churches of Santa Maria in Trastevere, Santi Quattro Coronati, and Santa Prassede. Lay buildings include a number of towers, the largest being the Torre delle Milizie and the Torre dei Conti, both next the Roman Forum, and the huge staircase leading to the basilica of Santa Maria in Ara Coeli.

Renaissance and Baroque

Rome was a major world centre of the Renaissance, second only to Florence, and was profoundly affected by the movement. Among others, a masterpiece of Renaissance architecture in Rome is the Piazza del Campidoglio by Michelangelo. During this period, the great aristocratic families of Rome used to build opulent dwellings as the Palazzo del Quirinale (now seat of the President of the Italian Republic), the Palazzo Venezia, the Palazzo Farnese, the Palazzo Barberini, the Palazzo Chigi (now seat of the Italian Prime Minister), the Palazzo Spada, the Palazzo della Cancelleria, and the Villa Farnesina.
Panoramic view of Piazza del Campidoglio, with the copy of the Equestrian Statue of Marcus Aurelius.

Many of the famous city's squares – some huge, majestic and often adorned with obelisks, some small and picturesque – got their present shape during the Renaissance and Baroque. The principal ones are Piazza Navona, Piazza di Spagna, Campo de' Fiori, Piazza Venezia, Piazza Farnese, Piazza della Rotonda and Piazza della Minerva. One of the most emblematic examples of Baroque art is the Fontana di Trevi by Nicola Salvi. Other notable 17th-century baroque palaces are the Palazzo Madama, now the seat of the Italian Senate and the Palazzo Montecitorio, now the seat of the Chamber of Deputies of Italy.

Neoclassicism


In 1870, Rome became the capital city of the new Kingdom of Italy. During this time, neoclassicism, a building style influenced by the architecture of antiquity, became a predominant influence in Roman architecture. During this period, many great palaces in neoclassical styles were built to host ministries, embassies, and other governing agencies. One of the best-known symbols of Roman neoclassicism is the Monument of Vittorio Emanuele II or "Altar of the Fatherland", where the Grave of the Unknown Soldier, that represents the 650,000 Italians that fell in World War I, is located.

Fascist architecture

The Fascist regime that ruled in Italy between 1922 and 1943 developed an architectural style that was characterised by its links with ancient Roman architecture. The most important Fascist site in Rome is the E.U.R district, designed in 1938 by Marcello Piacentini. It was originally conceived for the 1942 world exhibition, and was called "E.42" ("Esposizione 42"). The world exhibition, however, never took place because Italy entered the Second World War in 1940. The most representative building of the Fascist style at E.U.R. is the Palazzo della Civiltà Italiana (1938–1943), the iconic design of which has been labelled the cubic of Square Colosseum. After World War II, the Roman authorities found that they already had the seed of an off-centre business district of the type that other capitals were still planning (London Docklands and La Défense in Paris). Also the Palazzo della Farnesina, the current seat of the Italian Ministry of Foreign Affairs, was designed in 1935 in pure Fascist style.

Parks and gardens


The gardens of Villa Borghese.

Public parks and nature reserves cover a large area in Rome, and the city has one of the largest areas of green space among European capitals.[89] The most notable part of this green space is represented by the large number of villas and landscaped gardens created by the Italian aristocracy. While most of the parks surrounding the villas were destroyed during the building boom of the late 19th century, some of them remain. The most notable of these are Villa Borghese, Villa Ada, and Villa Doria Pamphili. Villa Doria Pamphili is west of the Gianicolo hill comprising some 1.8 square kilometres (0.7 sq mi). Also on the Gianicolo hill there is Villa Sciarra, with playgrounds for children and shaded walking areas. In the nearby area of Trastevere the Orto Botanico (Botanical Garden) is a cool and shady green space. The old Roman hippodrome (Circus Maximus) is another large green space: it has few trees, but is overlooked by the Palatine and the Rose Garden ('roseto comunale'). Nearby is the lush Villa Celimontana, close to the gardens surrounding the Baths of Caracalla. The Villa Borghese garden is the best known large green space in Rome, with famous art galleries among its shaded walks. Overlooking Piazza del Popolo and the Spanish Steps are the gardens of Pincio and Villa Medici. Noteworthy is also the Pine wood of Castelfusano, near Ostia. Rome also has a number of regional parks of much more recent origin including the Pineto Regional Park and the Appian Way Regional Park. There are also nature reserves at Marcigliana and at Tenuta di Castelporziano.

Fountains and aqueducts


The Trevi Fountain, one of the most famous in the world.
 
Rome is a city famous for its numerous fountains, built in all different styles, from Classical and Medieval, to Baroque and Neoclassical. The city has had fountains for more than two thousand years, and they have provided drinking water and decorated the piazzas of Rome. During the Roman Empire, in 98 AD, according to Sextus Julius Frontinus, the Roman consul who was named curator aquarum or guardian of the water of the city, Rome had nine aqueducts which fed 39 monumental fountains and 591 public basins, not counting the water supplied to the Imperial household, baths and owners of private villas. Each of the major fountains was connected to two different aqueducts, in case one was shut down for service.[90]

During the 17th and 18th century the Roman popes reconstructed other ruined Roman acqueducts and built new display fountains to mark their termini, launching the golden age of the Roman fountain. The fountains of Rome, like the paintings of Rubens, were expressions of the new style of Baroque art. They were crowded with allegorical figures, and filled with emotion and movement. In these fountains, sculpture became the principal element, and the water was used simply to animate and decorate the sculptures. They, like baroque gardens, were "a visual representation of confidence and power".[91]

Statues


Rome is well known for its statues but, in particular, the talking statues of Rome. These are usually ancient statues which have become popular soapboxes for political and social discussion, and places for people to (often satirically) voice their opinions. There are two main talking statues: the Pasquino and the Marforio, yet there are four other noted ones: il Babuino, Madama Lucrezia, il Facchino and Abbot Luigi. Most of these statues are ancient Roman or classical, and most of them also depict mythical gods, ancient people or legendary figures; il Pasquino represents Menelaus, Abbot Luigi is an unknown Roman magistrate, il Babuino is supposed to be Silenus, Marforio represents Oceanus, Madama Lucrezia is a bust of Isis, and il Facchino is the only non-Roman statue, created in 1580, and not representing anyone in particular. They are often, due to their status, covered with placards or graffiti expressing political ideas and points of view. Other statues in the city, which are not related to the talking statues, include those of the Ponte Sant'Angelo, or several monuments scattered across the city, such as that to Giordano Bruno in the Campo de'Fiori.

Obelisks and columns

The city hosts eight ancient Egyptian and five ancient Roman obelisks, together with a number of more modern obelisks; there was also formerly (until 2005) an ancient Ethiopian obelisk in Rome.[93] The city contains some of obelisks in piazzas, such as in Piazza Navona, St Peter's Square, Piazza Montecitorio, and Piazza del Popolo, and others in villas, thermae parks and gardens, such as in Villa Celimontana, the Baths of Diocletian, and the Pincian Hill. Moreover, the centre of Rome hosts also Trajan's and Antonine Column, two ancient Roman columns with spiral relief.

Bridges

Bridge of Angels which leads to Castel Sant'Angelo.

The city of Rome contains numerous famous bridges which cross the Tiber. The only bridge to remain unaltered until today from the classical age is Ponte dei Quattro Capi, which connect the Isola Tiberina with the left bank. The other surviving ancient Roman bridges crossing the Tiber are Ponte Cestio, Ponte Sant'Angelo and Ponte Milvio. Considering Ponte Nomentano, also built during ancient Rome, which crosses the Aniene, currently there are five ancient Roman bridges still remaining in the city.[94] Other noteworthy bridges are Ponte Sisto, the first bridge built in the Renaissance above Roman foundations; Ponte Rotto, actually the only remaining arch of the ancient Pons Aemilius, collapsed during the flood of 1598 and demolished at the end of the 19th century; and Ponte Vittorio Emanuele II, a modern bridge connecting Corso Vittorio Emanuele and Borgo. Most of the city's public bridges were built in Classical or Renaissance style, but also in Baroque, Neoclassical and Modern styles. According to the Encyclopædia Britannica, the finest ancient bridge remaining in Rome is the Ponte Sant'Angelo, which was completed in 135 AD, and was decorated with ten statues of the angels, designed by Bernini in 1688.[95]

Catacombs

Rome has extensive amount of ancient catacombs, or underground burial places under or near the city, of which there are at least forty, some discovered only in recent decades. Though most famous for Christian burials, they include pagan and Jewish burials, either in separate catacombs or mixed together. The first large-scale catacombs were excavated from the 2nd century onwards. Originally they were carved through tuff, a soft volcanic rock, outside the boundaries of the city, because Roman law forbade burial places within city limits. Currently maintenance of the catacombs is in the hands of the Papacy which has invested in the Salesians of Don Bosco the supervision of the Catacombs of St. Callixtus on the outskirts of Rome.

Economy

Panoramic view of EUR business district.
 
Being the capital city of Italy, Rome hosts all the principal institutions of the nation, like the Presidency of the Republic, the government (and its single Ministeri), the Parliament, the main judicial Courts, and the diplomatic representatives of all the countries for the states of Italy and the Vatican City (curiously, Rome also hosts, in the Italian part of its territory, the Embassy of Italy for the Vatican City, a unique case of an Embassy within the boundaries of its own country). Many international institutions are located in Rome, notably cultural and scientific ones – such as the American Institute, the British School, the French Academy, the Scandinavian Institutes, the German Archaeological Institute – for the honour of scholarship in the Eternal City, and Specialized Agencies of the United Nations, such as the FAO. Rome, also hosts major international and worldwide political and cultural organisations, such as the International Fund for Agricultural Development (IFAD), World Food Programme (WFP), the NATO Defence College and ICCROM, the International Center for the Study of the Preservation and Restoration of Cultural Property. Rome is currently an beta+ world city, falling down from its alpha- status in 2008, along with Berlin, Bucharest, Athens, Lisbon, Montreal and Budapest.[9]

Rome was also ranked in 2014 as 32nd in the Global Cities Index, being the highest-ranking city in Italy.[11] With a 2005 GDP of €94.376 billion (US$121.5 billion),[96] the city produces 6.7% of the national GDP (more than any other single city in Italy), and its unemployment rate, lowered from 11.1% to 6.5% between 2001 and 2005, is now one of the lowest rates of all the European Union capital cities.[96] Rome grows +4.4% annually and continues to grow at a higher rate in comparison to any other city in the rest of the country.[96] This means that were Rome a country, it would be the world's 52nd richest country by GDP, near to the size to that of Egypt. Rome also had a 2003 GDP per capita of €29,153 (US$37,412), which was second in Italy, (after Milan), and is more than 134.1% of the EU average GDP per capita.[97] Rome, on the whole, has the highest total earnings in Italy, reaching €47,076,890,463 in 2008,[98] yet, in terms of average workers' incomes, the city places itself 9th in Italy, with €24,509.[98] On a global level, Rome's workers receive the 30th highest wages in 2009, coming three places higher than in 2008, in which the city ranked 33rd.[99] The Rome area had a GDP amounting to $167.8 billion, and $38,765 per capita.[100]

Although the economy of Rome is characterised by the absence of heavy industry and it is largely dominated by services, high-technology companies (IT, aerospace, defence, telecommunications), research, construction and commercial activities (especially banking), and the huge development of tourism are very dynamic and extremely important to its economy. Rome's international airport, Fiumicino, is the largest in Italy, and the city hosts the head offices of the vast majority of the major Italian companies, as well as the headquarters of three of the world's 100 largest companies: Enel, Eni, and Telecom Italia.[101]

Universities, national radio and television and the movie industry in Rome are also important parts of the economy: Rome is also the hub of the Italian film industry, thanks to the Cinecittà studios, working since the 1930s. The city is also a centre for banking and insurance as well as electronics, energy, transport, and aerospace industries. Numerous international companies and agencies headquarters, government ministries, conference centres, sports venues, and museums are located in Rome's principal business districts: the Esposizione Universale Roma (EUR); the Torrino (further south from the EUR); the Magliana; the Parco de' Medici-Laurentina and the so-called Tiburtina-valley along the ancient Via Tiburtina.

Education


The new campus of Rome University, built in 1935 by Marcello Piacentini, in a 1938 picture.

Rome is a nationwide and major international centre for higher education, containing numerous academies, colleges and universities. According to the City Brands Index, Rome is considered the world's second most historically, educationally and culturally interesting and beautiful city.[102] It boasts a large variety of academies and colleges, and has always been a major worldwide intellectual and educational centre, especially during Ancient Rome and the Renaissance, along with Florence.[103]

Rome has a large number of universities and colleges. Its first university, La Sapienza (founded in 1303), is the largest in Europe and the second-largest in the world, with more than 140,000 students attending; in 2005 it ranked as Europe's 33rd best university[104] and currently ranks among Europe's 50 and the world's 150 best colleges.[105] In order to decrease the overcrowding of La Sapienza, two new public universities were founded during the last decades: Tor Vergata in 1982, and Roma Tre in 1992. Rome hosts also the LUISS School of Government, Italy's most important graduate university in the areas of international affairs and European studies. Rome ISIA was founded in 1973 by Giulio Carlo Argan and is Italy's oldest institution in the field of industrial design.

Rome contains also a large number of pontifical universities and other institutes, including the British School at Rome, the French School in Rome, the Pontifical Gregorian University (The oldest Jesuit university in the world, founded in 1551), Istituto Europeo di Design, the, the Scuola Lorenzo de' Medici, the Link Campus of Malta, and the Università Campus Bio-Medico. Rome is also the location of two American Universities; The American University of Rome[106] and John Cabot University as well as St. John's University branch campus, John Felice Rome Center, a campus of Loyola University Chicago and Temple University Rome, a campus of Temple University.[107] The Roman Colleges are several seminaries for students from foreign countries studying for the priesthood at the Pontifical Universities.[108] Examples include the Venerable English College, the Pontifical North American College, the Scots College, and the Pontifical Croatian College of St. Jerome.

Rome's major libraries include: the Biblioteca Angelica, opened in 1604, making it Italy's first public library; the Biblioteca Casanatense, opened in 1701; the Biblioteca Vallicelliana; Bibliotheca Hertziana – Max Planck Institute of Art History, a German library located in Rome, often noted for excellence in the arts and sciences;[109] the National Central Library, one of the two national libraries in Italy, which contains 4,126,002 volumes; The Biblioteca del Ministero degli Affari Esteri, specialised in diplomacy, foreign affairs and modern history; the Biblioteca dell'Istituto dell'Enciclopedia Italiana; the Biblioteca Don Bosco, one of the largest and most modern of all Salesian libraries; the Biblioteca e Museo teatrale del Burcardo, a museum-library specialised in history of drama and theatre; the Biblioteca della Società Geografica Italiana, which is based in the Villa Celimontana and is the most important geographical library in Italy, and one of Europe's most important;[110] and the Vatican Library, one of the oldest and most important libraries in the world, which was formally established in 1475, though in fact much older and has 75,000 codices from throughout history.[111]

Culture

Entertainment and performing arts

Rome is an important centre for music, and it has an intense musical scene, including several prestigious music conservatories and theatres. It hosts the Accademia Nazionale di Santa Cecilia (founded in 1585), for which new concert halls have been built in the new Parco della Musica, one of the largest musical venues in the world. Rome also has an opera house, the Teatro dell'Opera di Roma, as well as several minor musical institutions. The city also played host to the Eurovision Song Contest in 1991 and the MTV Europe Music Awards in 2004.
Rome has also had a major impact in music history. The Roman School was a group of composers of predominantly church music, which were active in the city during the 16th and 17th centuries, therefore spanning the late Renaissance and early Baroque eras. The term also refers to the music they produced. Many of the composers had a direct connection to the Vatican and the papal chapel, though they worked at several churches; stylistically they are often contrasted with the Venetian School of composers, a concurrent movement which was much more progressive. By far the most famous composer of the Roman School is Giovanni Pierluigi da Palestrina, whose name has been associated for four hundred years with smooth, clear, polyphonic perfection. However, there were other composers working in Rome, and in a variety of styles and forms.

Tourism

UNESCO World Heritage Site
Historic Centre of Rome, the Properties of the Holy See in that City Enjoying Extraterritorial Rights and San Paolo Fuori le Mura
Name as inscribed on the World Heritage List
Forum Romanum Rom.jpg
Type Cultural
Criteria i, ii, iii, iv, vi
Reference 91
UNESCO region Europe and North America
Inscription history
Inscription 1980 (4th Session)
Extensions 1990

Rome today is one of the most important tourist destinations of the world, due to the incalculable immensity of its archaeological and artistic treasures, as well as for the charm of its unique traditions, the beauty of its panoramic views, and the majesty of its magnificent "villas" (parks). Among the most significant resources are the many museums – Musei Capitolini, the Vatican Museums and the Galleria Borghese and others dedicated to modern and contemporary art – aqueducts, fountains, churches, palaces, historical buildings, the monuments and ruins of the Roman Forum, and the Catacombs. Rome is the third most visited city in the EU, after London and Paris, and receives an average of 7–10 million tourists a year, which sometimes doubles on holy years. The Colosseum (4 million tourists) and the Vatican Museums (4.2 million tourists) are the 39th and 37th (respectively) most visited places in the world, according to a recent study.[112]

Rome is a major archaeological hub, and one of the world's main centres of archaeological research. There are numerous cultural and research institutes located in the city, such as the American Academy in Rome,[113] and The Swedish Institute at Rome.[114] Rome contains numerous ancient sites, including the Forum Romanum, Trajan's Market, Trajan's Forum,[115] the Colosseum, and the Pantheon, to name but a few. The Colosseum, arguably one of Rome's most iconic archaeological sites, is regarded as a wonder of the world.[116][117]

Rome contains a vast and impressive collection of art, sculpture, fountains, mosaics, frescos, and paintings, from all different periods. Rome first became a major artistic centre during ancient Rome, with forms of important Roman art such as architecture, painting, sculpture and mosaic work. Metal-work, coin die and gem engraving, ivory carvings, figurine glass, pottery, and book illustrations are considered to be 'minor' forms of Roman artwork.[118] Rome later became a major centre of Renaissance art, since the popes spent vast sums of money for the constructions of grandiose basilicas, palaces, piazzas and public buildings in general. Rome became one of Europe's major centres of Renaissance artwork, second only to Florence, and able to compare to other major cities and cultural centres, such as Paris and Venice. The city was affected greatly by the baroque, and Rome became the home of numerous artists and architects, such as Bernini, Caravaggio, Carracci, Borromini and Cortona.[119] In the late 18th century and early 19th century, the city was one of the centres of the Grand Tour,[120] when wealthy, young English and other European aristocrats visited the city to learn about ancient Roman culture, art, philosophy and architecture. Rome hosted a great number of neoclassical and rococo artists, such as Pannini and Bernardo Bellotto. Today, the city is a major artistic centre, with numerous art institutes[121] and museums.
Internal view of the Colosseum

Original relief from the Arch of Titus showing spoils from the siege of Jerusalem and the destruction of its famous Second Temple

Rome has a growing stock of contemporary and modern art and architecture. The National Gallery of Modern Art has works by Balla, Morandi, Pirandello, Carrà, De Chirico, De Pisis, Guttuso, Fontana, Burri, Mastroianni, Turcato, Kandisky and Cézanne on permanent exhibition. 2010 saw the opening of Rome's newest arts foundation, a contemporary art and architecture gallery designed by acclaimed Iraqi architect Zaha Hadid. Known as MAXXI – National Museum of the 21st Century Arts it restores a dilapidated area with striking modern architecture. Maxxi[122] features a campus dedicated to culture, experimental research laboratories, international exchange and study and research. It is one of Rome's most ambitious modern architecture projects alongside Renzo Piano's Auditorium Parco della Musica[123] and Massimiliano Fuksas' Rome Convention Center, Centro Congressi Italia EUR, in the EUR district, due to open in 2011.[124] The Convention Center features a huge translucent container inside which is suspended a steel and teflon structure resembling a cloud and which contains meeting rooms and an auditorium with two piazzas open to the neighbourhood on either side.

Rome is also widely recognised as a world fashion capital. Although not as important as Milan, Rome is the world's fourth most important center for fashion in the world, according to the 2009 Global Language Monitor after Milan, New York and Paris, and beating London.[125] Major luxury fashion houses and jewellery chains, such as Bulgari, Fendi,[126] Laura Biagiotti and Brioni (fashion), are headquartered or were founded in the city. Also, other major labels, such as Chanel, Prada, Dolce & Gabbana, Armani and Versace have luxury boutiques in Rome, primarily along its prestigious and upscale Via dei Condotti.

Cuisine


Spaghetti alla Carbonara, a typical Roman dish

Carciofi alla giudia, example of Roman-Jewish cuisine

Rome's cuisine has evolved through centuries and periods of social, cultural, and political changes. Rome became a major gastronomical centre during the ancient Age. Ancient Roman cuisine was highly influenced by Ancient Greek culture, and after, the empire's enormous expansion exposed Romans to many new, provincial culinary habits and cooking techniques. Later, during the Renaissance, Rome became well known as a centre of high-cuisine, since some of the best chefs of the time, worked for the popes. An example of this could be Bartolomeo Scappi, who was a chef, working for Pius IV in the Vatican kitchen, and he acquired fame in 1570 when his cookbook Opera dell'arte del cucinare was published. In the book he lists approximately 1000 recipes of the Renaissance cuisine and describes cooking techniques and tools, giving the first known picture of a fork.[127]

In the modern age, the city developed its own peculiar cuisine, based on products of the nearby Campagna, as lamb and vegetables (globe artichokes are common).[128] In parallel, Roman Jews -present in the city since the 1st century BC- developed their own cuisine, the cucina giudaico-romanesca. Examples of Roman dishes include "Saltimbocca alla Romana" – a veal cutlet, Roman-style; topped with raw ham and sage and simmered with white wine and butter; "Carciofi alla romana" – artichokes Roman-style; outer leaves removed, stuffed with mint, garlic, breadcrumbs and braised; "Carciofi alla giudia" – artichokes fried in olive oil, typical of Roman Jewish cooking; outer leaves removed, stuffed with mint, garlic, breadcrumbs and braised; "Spaghetti alla carbonara" – spaghetti with bacon, eggs and pecorino, and "Gnocchi di semolino alla romana" – semolina dumpling, Roman-style, to name but a few.[129]

Cinema


Set of Gangs of New York in Cinecittà studios, Rome

Rome hosts the Cinecittà Studios,[130] the largest film and television production facility in continental Europe and the centre of the Italian cinema, where a large number of today's biggest box office hits are filmed. The 99-acre (40 ha) studio complex is 5.6 miles (9.0 km) from the centre of Rome and is part of one of the biggest production communities in the world, second only to Hollywood, with well over 5,000 professionals – from period costume makers to visual effects specialists. More than 3,000 productions have been made on its lot, from recent features like The Passion of the Christ, Gangs of New York, HBO's Rome, The Life Aquatic and Dino De Laurentiis' Decameron, to such cinema classics as Ben-Hur, Cleopatra, and the films of Federico Fellini.

Founded in 1937 by Benito Mussolini, the studios were bombed by the Western Allies during the Second World War. In the 1950s, Cinecittà was the filming location for several large American film productions, and subsequently became the studio most closely associated with Federico Fellini. Today Cinecittà is the only studio in the world with pre-production, production, and full post-production facilities on one lot, allowing directors and producers to walk in with their script and "walk out" with a completed film.

Language

Although associated today only with Latin, ancient Rome was in fact multilingual. In highest antiquity Sabine tribes shared the area of what is today Rome with Latin tribes. The Sabine language was one of the Italic group of ancient Italian languages, along with Etruscan, which would have been the main language of the last three kings who ruled the city till the founding of the Republic in 509 BC. Urganilla, or Plautia Urgulanilla, wife of Emperor Claudius, is thought to have been a speaker of Etruscan many centuries after this date, according to Suetonius' entry on Claudius. However Latin, in various evolving forms, was the main language of classical Rome, but as the city had immigrants, slaves, residents, ambassadors from many parts of the world it was also multilingual. Many educated Romans also spoke Greek, and there was a large Greek, Syriac and Jewish population in parts of Rome from well before the Empire.
Latin evolved during the Middle Ages into a new language, the volgare. The latter emerged as the confluence of various regional dialects, among which the Tuscan dialect predominated, but the population of Rome also developed its own dialect, the Romanesco. The Romanesco spoken during the Middle Ages was a southern Italian dialect, very close to the Neapolitan. The influence of the Florentine culture during the renaissance, and, above all, the immigration to Rome of many Florentines following the two Medici Popes (Leo X and Clement VII), caused a major shift in the dialect, which began to resemble more the Tuscan varieties. This remained largely confined to Rome until the 19th century, but then expanded to other zones of Lazio (Civitavecchia, Latina), from the beginning of the 20th century, thanks to the rising population of Rome and to better transportation systems. As a consequence of education and media like radio and television, Romanesco became more and more similar to standard Italian. Dialectal literature in the traditional form Romanesco includes the works of such authors as Giuseppe Gioachino Belli (one of the most important Italian poets altogether), Trilussa, and Cesare Pascarella. Contemporary Romanesco is mainly represented by popular actors such as Aldo Fabrizi, Alberto Sordi, Nino Manfredi, Anna Magnani, Gigi Proietti, Enrico Montesano, and Carlo Verdone.

Rome's historic contribution to language in a worldwide sense is much more extensive however. Through the process of Romanisation, the peoples of Gallia, the Iberian Peninsula, Italy and Dacia developed languages which derive directly from Latin and were adopted in large areas of the world both through colonization and cultural influence. Moreover, also modern English, because of the Norman Conquest, borrowed a large percentage of its vocabulary from the Latin language. The Roman or Latin alphabet is the most widely used writing system in the world used by the greatest number of languages.[131]

Rome has long hosted artistic communities, foreign resident communities and a large number of foreign religious students or pilgrims and so has always been a multilingual city. Today because of mass tourism many languages are used in servicing tourism, especially English which is widely known in tourist areas, and the city hosts large numbers of immigrants and so has many multilingual immigrant areas.

Sports


Stadio Olimpico, one of the largest in Europe, with a capacity of over 70,000.[132]

The Olympic Stadium is mostly used as a shared home stadium for Serie A football clubs S.S. Lazio and A.S. Roma, who contest the Derby della Capitale.[133]

Association football is the most popular sport in Rome, as in the rest of the country. The city hosted the final games of the 1934 and 1990 FIFA World Cup. The latter took place in the Olympic Stadium, which is also the home stadium for local Serie A clubs S.S. Lazio, founded in 1900, and A.S. Roma was founded in 1927, whose rivalry has become a staple of Roman sports culture. Footballers who play for these teams and are also born in the city tend to become especially popular, as has been the case with players such as Francesco Totti and Daniele De Rossi (both for A.S. Roma). Atletico Roma is a minor team that played in First Division until 2012; its home stadium was Stadio Flaminio.

Rome hosted the 1960 Summer Olympics, with great success, using many ancient sites such as the Villa Borghese and the Thermae of Caracalla as venues. For the Olympic Games many new structures were created, notably the new large Olympic Stadium (which was also enlarged and renewed to host qualification and the final match of the 1990 FIFA World Cup), the Villaggio Olimpico (Olympic Village, created to host the athletes and redeveloped after the games as a residential district), ecc. Rome made a bid to host the 2020 Summer Olympics but it was withdrawn before the deadline for applicant files.[134][135]

Rugby union is gaining wider acceptance. Until 2011 the Stadio Flaminio was the home stadium for the Italy national rugby union team, which has been playing in the Six Nations Championship since 2000. The team now plays home games at the Stadio Olimpico because the Stadio Flaminio needs works of renovation in order to improve both its capacity and safety. Rome is home to local rugby union teams such as Rugby Roma (founded in 1930 and winner of five Italian championships, the latter in 1999–2000), Unione Rugby Capitolina and S.S. Lazio 1927 (rugby union branch of the multisport club S.S. Lazio).

Every May, Rome hosts the ATP Masters Series tennis tournament on the clay courts of the Foro Italico. Cycling was popular in the post-World War II period, although its popularity has faded. Rome has hosted the final portion of the Giro d'Italia twice, in 1989 and 2000. Rome is also home to other sports teams, including basketball (Virtus Roma), volleyball (M. Roma Volley), handball or waterpolo.

Transport


Rome is at the centre of the radial network of roads that roughly follow the lines of the ancient Roman roads which began at the Capitoline Hill and connected Rome with its empire. Today Rome is circled, at a distance of about 10 km (6 mi) from the Capitol, by the ring-road (the Grande Raccordo Anulare or GRA).

Due to its location in the centre of the Italian peninsula, Rome is the principal railway node for central Italy. Rome's main railway station, Termini, is one of the largest railway stations in Europe and the most heavily used in Italy, with around 400 thousand travellers passing through every day. The second-largest station in the city, Roma Tiburtina, has been redeveloped as a high-speed rail terminus.[136]

Rome is served by three airports. The intercontinental Leonardo da Vinci International Airport is Italy's chief airport, is located within the nearby Fiumicino, south-west of Rome. The older Rome Ciampino Airport is a joint civilian and military airport. It is commonly referred to as "Ciampino Airport", as it is located beside Ciampino, south-east of Rome. A third airport, the Roma-Urbe Airport, is a small, low-traffic airport located about 6 km (4 mi) north of the city centre, which handles most helicopter and private flights.

Altough the city has its own quarter on the Mediterranean Sea (Lido di Ostia), this has only a marina and a small channel-harbour for fisher boats. The main harbour which serves Rome is Port of Civitavecchia, located about 62 km northwest of the city.[137]

The city suffers from traffic problems largely due to this radial street pattern, making it difficult for Romans to move easily from the vicinity of one of the radial roads to another without going into the historic centre or using the ring-road. These problems are not helped by the limited size of Rome's metro system when compared to other cities of similar size. In addition, Rome has only 21 taxis for every 10,000 inhabitants, far below other major European cities.[138] Chronic congestion caused by cars during the 1970s and 1980s led to restrictions being placed on vehicle access to the inner city-centre during the hours of daylight. Areas where these restriction apply are known as Limited Traffic Zones (Zona a Traffico Limitato (ZTL) in Italian). More recently, heavy night-time traffic in Trastevere, Testaccio and San Lorenzo has led to the creation of night-time ZTLs in those districts.

Overview map of Rome's underground and rail system in 2014

A 3-line metro system called the Metropolitana operates in Rome. Construction on the first branch started in the 1930s. The line had been planned to quickly connect the main railway station with the newly planned E42 area in the southern suburbs, where the 1942 World Fair was supposed to be held. The event never took place because of war, but the area was later partly redesigned and renamed EUR (Esposizione Universale di Roma: Rome Universal Exhibition) in the 1950s to serve as a modern business district. The line was finally opened in 1955, and it is now the south part of the B Line.

The A line opened in 1980 from Ottaviano to Anagnina stations, later extended in stages (1999–2000) to Battistini. In the 1990s, an extension of the B line was opened from Termini to Rebibbia. This underground network is generally reliable (although it may become very congested at peak times and during events, especially the A line) as it is relatively short.

The A and B lines intersect at Roma Termini station. A new branch of the B line (B1) opened on 13 June 2012 after an estimated building cost of €500 million. B1 connects to line B at Piazza Bologna and has four stations over a distance of 3.9 km (2 mi).

A third line, the C line, is under construction with an estimated cost of €3 billion and will have 30 stations over a distance of 25.5 km (16 mi). It will partly replace the existing Termini-Pantano rail line. It will feature full automated, driverless trains.[139] The first section with 15 stations connecting Pantano with the quarter of Centocelle in the eastern part of the city, opened on 9 November 2014.[140] The end of the work was scheduled in 2015, but archaeological findings often delay underground construction work.

A fourth line, D line, is also planned. It will have 22 stations over a distance of 20 km (12 mi). The first section was projected to open in 2015 and the final sections before 2035, but due to the city's financial crisis the project has been put on hold.

Above-ground public transport in Rome is made up of a bus, tram and urban train network (FR lines). The bus, tram, metro and urban railways network is run by Atac S.p.A. (which originally stood for the Municipal Bus and Tramways Company, Azienda Tramvie e Autobus del Comune in Italian). The bus network has in excess of 350 bus lines and over eight thousand bus stops, whereas the more-limited tram system has 39 km (24 mi) of track and 192 stops.[141][142] There is also one trolleybus line, opened in 2005, and additional trolleybus lines are planned.[143]

International entities, organisations and involvement


FAO headquarters in Rome, Circo Massimo

Among the global cities, Rome is unique in having a sovereign state located entirely within its city limits, the Vatican City. The Vatican is an enclave of the Italian capital city and a sovereign possession of the Holy See which is the Diocese of Rome and the supreme government of the Roman Catholic Church. Rome hosts foreign embassies to both Italy and the Holy See, although frequently the same ambassador is accredited to both. Several international Roman Colleges and Pontifical Universities are located in Rome.

The Pope is the Bishop of Rome and its official seat is the Archbasilica of St. John Lateran (of which the President of the French Republic is ex officio the "first and only honorary canon", a title held by the heads of the French state since King Henry IV of France). Another body, the Sovereign Military Order of Malta (SMOM), took refuge in Rome in 1834, due to the conquest of Malta by Napoleon in 1798. It is sometimes classified as having sovereignty but does not claim any territory in Rome or anywhere else, hence leading to dispute over its actual sovereign status.

Rome is the seat of the so-called Roman Pole[144] made up by three main international agencies of the United Nations : the Food and Agriculture Organization (FAO), the World Food Programme (WFP) and the International Fund for Agricultural Development (IFAD).

Rome has traditionally been involved in the process of European political integration. The Treaties of the EU are located in Palazzo della Farnesina, seat of the Ministry of Foreign Affairs, due the fact that the Italian government is the depositary of the treaties. In 1957 the city hosted the signing of the Treaty of Rome, which established the European Economic Community (predecessor to the European Union), and also played host to the official signing of the proposed European Constitution in July 2004.

Rome is the seat of the NATO Defense College and is the place where the Statute of the International Criminal Court and the European Convention on Human Rights were formulated.

The city hosts also other important international entities such as the ICCROM (International Centre for the Study of the Preservation and Restoration of Cultural Property) and the UNIDROIT (International Institute for the Unification of Private Law).

Twin towns, sister cities and partner cities

Column dedicated to Paris in 1956 near the Baths of Diocletian

Rome is since April 9, 1956 exclusively and reciprocally twinned only with:
(French) Seule Paris est digne de Rome; seule Rome est digne de Paris.
(Italian) Solo Parigi è degna di Roma; solo Roma è degna di Parigi.
"Only Paris is worthy of Rome; only Rome is worthy of Paris."[145][146][147]
Rome's sister and partner cities are:

Dark energy


From Wikipedia, the free encyclopedia


The expansion of the universe accelerating. Time flows from bottom to top[1]

In physical cosmology and astronomy, dark energy is an unknown form of energy which permeates all of space and tends to accelerate the expansion of the universe.[2] Dark energy is the most accepted hypothesis to explain the observations since the 1990s indicating that the Universe is expanding at an accelerating rate. According to the Planck mission team, and based on the standard model of cosmology, on a mass–energy equivalence basis, the observable universe contains 26.8% dark matter, 68.3% dark energy (for a total of 95.1%) and 4.9% ordinary matter.[3][4][5][6] Again on a mass–energy equivalence basis, the density of dark energy (6.91 × 10−27 kg/m3) is very low, much less than the density of ordinary matter or dark matter within galaxies. However, it comes to dominate the mass–energy of the Universe because it is uniform across space.[7] Dark Energy dominates the mass of the Universe by nearly 3:1.[8] Two proposed forms for dark energy are the cosmological constant, a constant energy density filling space homogeneously,[9] and scalar fields such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space.
Contributions from scalar fields that are constant in space are usually also included in the cosmological constant. The cosmological constant can be formulated to be equivalent to vacuum energy. Scalar fields that do change in space can be difficult to distinguish from a cosmological constant because the change may be extremely slow.

High-precision measurements of the expansion of the universe are required to understand how the expansion rate changes over time and space. In general relativity, the evolution of the expansion rate is parameterized by the cosmological equation of state (the relationship between temperature, pressure, and combined matter, energy, and vacuum energy density for any region of space). Measuring the equation of state for dark energy is one of the biggest efforts in observational cosmology today.

Adding the cosmological constant to cosmology's standard FLRW metric leads to the Lambda-CDM model, which has been referred to as the "standard model" of cosmology because of its precise agreement with observations. Dark energy has been used as a crucial ingredient in a recent attempt to formulate a cyclic model for the Universe.[10]

Nature of dark energy

Many things about the nature of dark energy remain matters of speculation. The evidence for dark energy is indirect but comes from three independent sources:
  • Distance measurements and their relation to redshift, which suggest the Universe has expanded more in the last half of its life.[11]
  • The theoretical need for a type of additional energy that is not matter or dark matter to form the observationally flat universe (absence of any detectable global curvature).
  • It can be inferred from measures of large scale wave-patterns of mass density in the Universe.
Dark energy is thought to be very homogeneous, not very dense and is not known to interact through any of the fundamental forces other than gravity. Since it is quite rarefied—roughly 10−30 g/cm3—it is unlikely to be detectable in laboratory experiments. Dark energy can have such a profound effect on the Universe, making up 68% of universal density, only because it uniformly fills otherwise empty space. The two leading models are a cosmological constant and quintessence. Both models include the common characteristic that dark energy must have negative pressure.

Effect of dark energy: a small constant negative pressure of vacuum

Independently of its actual nature, dark energy would need to have a strong negative pressure (acting repulsively) in order to explain the observed acceleration of the expansion of the universe.

According to General Relativity, the pressure within a substance contributes to its gravitational attraction for other things just as its mass density does. This happens because the physical quantity that causes matter to generate gravitational effects is the stress–energy tensor, which contains both the energy (or matter) density of a substance and its pressure and viscosity.

In the Friedmann–Lemaître–Robertson–Walker metric, it can be shown that a strong constant negative pressure in all the Universe causes an acceleration in universe expansion if the Universe is already expanding, or a deceleration in universe contraction if the Universe is already contracting.

More exactly, the second derivative of the Universe scale factor, a¨, is positive if the equation of state of the Universe is such that  w<1/3 (see Friedmann equations).

This accelerating expansion effect is sometimes labeled "gravitational repulsion", which is a colorful but possibly confusing expression. In fact a negative pressure does not influence the gravitational interaction between masses—which remains attractive—but rather alters the overall evolution of the Universe at the cosmological scale, typically resulting in the accelerating expansion of the Universe despite the attraction among the masses present in the Universe.

The acceleration is simply a function of dark energy density. Dark energy is persistent: its density remains constant (experimentally, within a factor of 1:10), i.e. it does not get diluted when space expands.

Accelerated expansion of spacetime

Evidence of existence

Supernovae


A Type Ia supernova (bright spot on the bottom-left) near a galaxy

In 1998, published observations of Type Ia supernovae ("one-A") by the High-Z Supernova Search Team[12] followed in 1999 by the Supernova Cosmology Project[13] suggested that the expansion of the Universe is accelerating.[14] The 2011 Nobel Prize in Physics was awarded to Saul Perlmutter, Brian P. Schmidt and Adam G. Riess for their leadership in the discovery.[15][16]

Since then, these observations have been corroborated by several independent sources. Measurements of the cosmic microwave background, gravitational lensing, and the large-scale structure of the cosmos as well as improved measurements of supernovae have been consistent with the Lambda-CDM model.[17] Some people argue that the only indication for the existence of dark energy is observations of distance measurements and associated redshifts. Cosmic microwave background anisotropies and baryon acoustic oscillations are only observations that redshifts are larger than expected from a "dusty" Friedmann–Lemaître universe and the local measured Hubble constant.[18]

Supernovae are useful for cosmology because they are excellent standard candles across cosmological distances. They allow the expansion history of the Universe to be measured by looking at the relationship between the distance to an object and its redshift, which gives how fast it is receding from us. The relationship is roughly linear, according to Hubble's law. It is relatively easy to measure redshift, but finding the distance to an object is more difficult. Usually, astronomers use standard candles: objects for which the intrinsic brightness, the absolute magnitude, is known. This allows the object's distance to be measured from its actual observed brightness, or apparent magnitude. Type Ia supernovae are the best-known standard candles across cosmological distances because of their extreme and consistent luminosity.

Recent observations of supernovae are consistent with a universe made up 71.3% of dark energy and 27.4% of a combination of dark matter and baryonic matter.[19]

Cosmic microwave background


Estimated distribution of matter and energy in the universe

The existence of dark energy, in whatever form, is needed to reconcile the measured geometry of space with the total amount of matter in the Universe. Measurements of cosmic microwave background (CMB) anisotropies indicate that the Universe is close to flat. For the shape of the universe to be flat, the mass/energy density of the Universe must be equal to the critical density. The total amount of matter in the Universe (including baryons and dark matter), as measured from the CMB spectrum, accounts for only about 30% of the critical density. This implies the existence of an additional form of energy to account for the remaining 70%.[17] The Wilkinson Microwave Anisotropy Probe (WMAP) spacecraft seven-year analysis estimated a universe made up of 72.8% dark energy, 22.7% dark matter and 4.5% ordinary matter.[5] Work done in 2013 based on the Planck spacecraft observations of the CMB gave a more accurate estimate of 68.3% of dark energy, 26.8% of dark matter and 4.9% of ordinary matter.[20]

Large-scale structure

The theory of large-scale structure, which governs the formation of structures in the Universe (stars, quasars, galaxies and galaxy groups and clusters), also suggests that the density of matter in the Universe is only 30% of the critical density.

A 2011 survey, the WiggleZ galaxy survey of more than 200,000 galaxies, provided further evidence towards the existence of dark energy, although the exact physics behind it remains unknown.[21][22] The WiggleZ survey from Australian Astronomical Observatory scanned the galaxies to determine their redshift. Then, by exploiting the fact that baryon acoustic oscillations have left voids regularly of ~150 Mpc diameter, surrounded by the galaxies, the voids were used as standard rulers to determine distances to galaxies as far as 2,000 Mpc (redshift 0.6), which allowed astronomers to determine more accurately the speeds of the galaxies from their redshift and distance. The data confirmed cosmic acceleration up to half of the age of the Universe (7 billion years) and constrain its inhomogeneity to 1 part in 10.[22] This provides a confirmation to cosmic acceleration independent of supernovae.

Late-time integrated Sachs-Wolfe effect

Accelerated cosmic expansion causes gravitational potential wells and hills to flatten as photons pass through them, producing cold spots and hot spots on the CMB aligned with vast supervoids and superclusters. This so-called late-time Integrated Sachs–Wolfe effect (ISW) is a direct signal of dark energy in a flat universe.[23] It was reported at high significance in 2008 by Ho et al.[24] and Giannantonio et al.[25]

Observational Hubble constant data

A new approach to test evidence of dark energy through observational Hubble constant (H(z)) data (OHD) has gained significant attention in recent years.[26][27][28][29] The Hubble constant is measured as a function of cosmological redshift. OHD directly tracks the expansion history of the Universe by taking passively evolving early-type galaxies as “cosmic chronometers”.[30] From this point, this approach provides standard clocks in the Universe. The core of this idea is the measurement of the differential age evolution as a function of redshift of these cosmic chronometers.
Thus, it provides a direct estimate of the Hubble parameter H(z)=-1/(1+z)dz/dt≈-1/(1+z)Δz/Δt. The merit of this approach is clear: the reliance on a differential quantity, Δz/Δt, can minimize many common issues and systematic effects; and as a direct measurement of the Hubble parameter instead of its integral, like supernovae and baryon acoustic oscillations (BAO), it brings more information and is appealing in computation. For these reasons, it has been widely used to examine the accelerated cosmic expansion and study properties of dark energy.

Theories of explanation

Cosmological constant

Lambda, the letter that represents the cosmological constant

The simplest explanation for dark energy is that it is simply the "cost of having space": that is, a volume of space has some intrinsic, fundamental energy. This is the cosmological constant, sometimes called Lambda (hence Lambda-CDM model) after the Greek letter Λ, the symbol used to represent this quantity mathematically. Since energy and mass are related by E = mc2, Einstein's theory of general relativity predicts that this energy will have a gravitational effect. It is sometimes called a vacuum energy because it is the energy density of empty vacuum. In fact, most theories of particle physics predict vacuum fluctuations that would give the vacuum this sort of energy. This is related to the Casimir effect, in which there is a small suction into regions where virtual particles are geometrically inhibited from forming (e.g. between plates with tiny separation). The cosmological constant is estimated by cosmologists to be on the order of 10−29 g/cm3, or about 10−120 in reduced Planck units[citation needed]. Particle physics predicts a natural value of 1 in reduced Planck units, leading to a large discrepancy.

The cosmological constant has negative pressure equal to its energy density and so causes the expansion of the Universe to accelerate. The reason why a cosmological constant has negative pressure can be seen from classical thermodynamics; Energy must be lost from inside a container to do work on the container. A change in volume dV requires work done equal to a change of energy −P dV, where P is the pressure. But the amount of energy in a container full of vacuum actually increases when the volume increases (dV is positive), because the energy is equal to ρV, where ρ (rho) is the energy density of the cosmological constant. Therefore, P is negative and, in fact, P = −ρ.

A major outstanding problem is that most quantum field theories predict a huge cosmological constant from the energy of the quantum vacuum, more than 100 orders of magnitude too large.[9] This would need to be cancelled almost, but not exactly, by an equally large term of the opposite sign. Some supersymmetric theories require a cosmological constant that is exactly zero,[citation needed] which does not help because supersymmetry must be broken. The present scientific consensus amounts to extrapolating the empirical evidence where it is relevant to predictions, and fine-tuning theories until a more elegant solution is found. Technically, this amounts to checking theories against macroscopic observations. Unfortunately, as the known error-margin in the constant predicts the fate of the universe more than its present state, many such "deeper" questions remain unknown.

In spite of its problems, the cosmological constant is in many respects the most economical solution to the problem of cosmic acceleration. One number successfully explains a multitude of observations. Thus, the current standard model of cosmology, the Lambda-CDM model, includes the cosmological constant as an essential feature.

Quintessence

In quintessence models of dark energy, the observed acceleration of the scale factor is caused by the potential energy of a dynamical field, referred to as quintessence field. Quintessence differs from the cosmological constant in that it can vary in space and time. In order for it not to clump and form structure like matter, the field must be very light so that it has a large Compton wavelength.

No evidence of quintessence is yet available, but it has not been ruled out either. It generally predicts a slightly slower acceleration of the expansion of the Universe than the cosmological constant. Some scientists think that the best evidence for quintessence would come from violations of Einstein's equivalence principle and variation of the fundamental constants in space or time.[citation needed] Scalar fields are predicted by the standard model and string theory, but an analogous problem to the cosmological constant problem (or the problem of constructing models of cosmic inflation) occurs: renormalization theory predicts that scalar fields should acquire large masses.

The cosmic coincidence problem asks why the cosmic acceleration began when it did. If cosmic acceleration began earlier in the Universe, structures such as galaxies would never have had time to form and life, at least as we know it, would never have had a chance to exist. Proponents of the anthropic principle view this as support for their arguments. However, many models of quintessence have a so-called tracker behavior, which solves this problem. In these models, the quintessence field has a density which closely tracks (but is less than) the radiation density until matter-radiation equality, which triggers quintessence to start behaving as dark energy, eventually dominating the Universe. This naturally sets the low energy scale of the dark energy.[citation needed]

In 2004, when scientists fit the evolution of dark energy with the cosmological data, they found that the equation of state had possibly crossed the cosmological constant boundary (w=−1) from above to below. A No-Go theorem has been proved that gives this scenario at least two degrees of freedom as required for dark energy models. This scenario is so-called Quintom scenario.

Some special cases of quintessence are phantom energy, in which the energy density of quintessence actually increases with time, and k-essence (short for kinetic quintessence) which has a non-standard form of kinetic energy. They can have unusual properties: phantom energy, for example, can cause a Big Rip.

Alternative ideas

Some alternatives to dark energy aim to explain the observational data by a more refined use of established theories, focusing, for example, on the gravitational effects of density inhomogeneities, or on consequences of electroweak symmetry breaking in the early universe. If we are located in an emptier-than-average region of space, the observed cosmic expansion rate could be mistaken for a variation in time, or acceleration.[31][32][33][34] A different approach uses a cosmological extension of the equivalence principle to show how space might appear to be expanding more rapidly in the voids surrounding our local cluster. While weak, such effects considered cumulatively over billions of years could become significant, creating the illusion of cosmic acceleration, and making it appear as if we live in a Hubble bubble.[35][36][37]

Another class of theories attempts to come up with an all-encompassing theory of both dark matter and dark energy as a single phenomenon that modifies the laws of gravity at various scales. An example of this type of theory is the theory of dark fluid. Another class of theories that unifies dark matter and dark energy are suggested to be covariant theories of modified gravities. These theories alter the dynamics of the space-time such that the modified dynamic stems what have been assigned to the presence of dark energy and dark matter.[38]

A 2011 paper in the journal Physical Review D by Christos Tsagas, a cosmologist at Aristotle University of Thessaloniki in Greece, argued that it is likely that the accelerated expansion of the Universe is an illusion caused by the relative motion of us to the rest of the Universe. The paper cites data showing that the 2.5 billion ly wide region of space we are inside of is moving very quickly relative to everything around it. If the theory is confirmed, then dark energy would not exist (but the "dark flow" still might).[39][40]

Some theorists think that dark energy and cosmic acceleration are a failure of general relativity on very large scales, larger than superclusters.[citation needed] However most attempts at modifying general relativity have turned out to be either equivalent to theories of quintessence, or inconsistent with observations.[citation needed] Other ideas for dark energy have come from string theory, brane cosmology and the holographic principle, but have not yet proved[citation needed] as compelling as quintessence and the cosmological constant.

On string theory, an article in the journal Nature described:
String theories, popular with many particle physicists, make it possible, even desirable, to think that the observable universe is just one of 10500 universes in a grander multiverse, says Leonard Susskind, a cosmologist at Stanford University in California. The vacuum energy will have different values in different universes, and in many or most it might indeed be vast. But it must be small in ours because it is only in such a universe that observers such as ourselves can evolve.
[41]
Paul Steinhardt in the same article criticizes string theory's explanation of dark energy stating "...Anthropics and randomness don't explain anything... I am disappointed with what most theorists are willing to accept".[41]

Another set of proposals is based on the possibility of a double metric tensor for space-time.[42][43] It has been argued that time reversed solutions in general relativity require such double metric for consistency, and that both dark matter and dark energy can be understood in terms of time reversed solutions of general relativity.[44]

It has been shown that if inertia is assumed to be due to the effect of horizons on Unruh radiation then this predicts galaxy rotation and a cosmic acceleration similar to that observed [45]

Implications for the fate of the universe

Cosmologists estimate that the acceleration began roughly 5 billion years ago. Before that, it is thought that the expansion was decelerating, due to the attractive influence of dark matter and baryons. The density of dark matter in an expanding universe decreases more quickly than dark energy, and eventually the dark energy dominates. Specifically, when the volume of the Universe doubles, the density of dark matter is halved, but the density of dark energy is nearly unchanged (it is exactly constant in the case of a cosmological constant).

If the acceleration continues indefinitely, the ultimate result will be that galaxies outside the local supercluster will have a line-of-sight velocity that continually increases with time, eventually far exceeding the speed of light.[46] This is not a violation of special relativity because the notion of "velocity" used here is different from that of velocity in a local inertial frame of reference, which is still constrained to be less than the speed of light for any massive object (see Uses of the proper distance for a discussion of the subtleties of defining any notion of relative velocity in cosmology). Because the Hubble parameter is decreasing with time, there can actually be cases where a galaxy that is receding from us faster than light does manage to emit a signal which reaches us eventually.[47][48] However, because of the accelerating expansion, it is projected that most galaxies will eventually cross a type of cosmological event horizon where any light they emit past that point will never be able to reach us at any time in the infinite future[49] because the light never reaches a point where its "peculiar velocity" toward us exceeds the expansion velocity away from us (these two notions of velocity are also discussed in Uses of the proper distance). Assuming the dark energy is constant (a cosmological constant), the current distance to this cosmological event horizon is about 16 billion light years, meaning that a signal from an event happening at present would eventually be able to reach us in the future if the event were less than 16 billion light years away, but the signal would never reach us if the event were more than 16 billion light years away.[48]

As galaxies approach the point of crossing this cosmological event horizon, the light from them will become more and more redshifted, to the point where the wavelength becomes too large to detect in practice and the galaxies appear to vanish completely[50][51] (see Future of an expanding universe). The Earth, the Milky Way, and the Virgo Supercluster[contradictory], however, would remain virtually undisturbed while the rest of the Universe recedes and disappears from view. In this scenario, the local supercluster would ultimately suffer heat death, just as was thought for the flat, matter-dominated universe before measurements of cosmic acceleration.

There are some very speculative ideas about the future of the Universe. One suggests that phantom energy causes divergent expansion, which would imply that the effective force of dark energy continues growing until it dominates all other forces in the Universe. Under this scenario, dark energy would ultimately tear apart all gravitationally bound structures, including galaxies and solar systems, and eventually overcome the electrical and nuclear forces to tear apart atoms themselves, ending the Universe in a "Big Rip". On the other hand, dark energy might dissipate with time or even become attractive. Such uncertainties leave open the possibility that gravity might yet rule the day and lead to a universe that contracts in on itself in a "Big Crunch".[8] Some scenarios, such as the cyclic model, suggest this could be the case. It is also possible the Universe may never have an end and continue in its present state forever (see The Second Law as a law of disorder). While these ideas are not supported by observations, they are not ruled out.

History of discovery and previous speculation

The cosmological constant was first proposed by Einstein as a mechanism to obtain a solution of the gravitational field equation that would lead to a static universe, effectively using dark energy to balance gravity.[52] Not only was the mechanism an inelegant example of fine-tuning but it was also later realized that Einstein's static universe would actually be unstable because local inhomogeneities would ultimately lead to either the runaway expansion or contraction of the Universe. The equilibrium is unstable: If the Universe expands slightly, then the expansion releases vacuum energy, which causes yet more expansion. Likewise, a universe which contracts slightly will continue contracting. These sorts of disturbances are inevitable, due to the uneven distribution of matter throughout the Universe. More importantly, observations made by Edwin Hubble in 1929 showed that the Universe appears to be expanding and not static at all. Einstein reportedly referred to his failure to predict the idea of a dynamic universe, in contrast to a static universe, as his greatest blunder.[53]

Alan Guth and Alexei Starobinsky proposed in 1980 that a negative pressure field, similar in concept to dark energy, could drive cosmic inflation in the very early universe. Inflation postulates that some repulsive force, qualitatively similar to dark energy, resulted in an enormous and exponential expansion of the Universe slightly after the Big Bang. Such expansion is an essential feature of most current models of the Big Bang. However, inflation must have occurred at a much higher energy density than the dark energy we observe today and is thought to have completely ended when the Universe was just a fraction of a second old. It is unclear what relation, if any, exists between dark energy and inflation. Even after inflationary models became accepted, the cosmological constant was thought to be irrelevant to the current universe.

Nearly all inflation models predict that the total (matter+energy) density of the Universe should be very close to the critical density. During the 1980s, most cosmological research focused on models with critical density in matter only, usually 95% cold dark matter and 5% ordinary matter (baryons). These models were found to be successful at forming realistic galaxies and clusters, but some problems appeared in the late 1980s: notably, the model required a value for the Hubble constant lower than preferred by observations, and the model under-predicted observations of large-scale galaxy clustering. These difficulties became stronger after the discovery of anisotropy in the cosmic microwave background by the COBE spacecraft in 1992, and several modified CDM models came under active study through the mid-1990s: these included the Lambda-CDM model and a mixed cold/hot dark matter model. The first direct evidence for dark energy came from supernova observations in 1998 of accelerated expansion in Riess et al.[12] and in Perlmutter et al.,[13] and the Lambda-CDM model then became the leading model. Soon after, dark energy was supported by independent observations: in 2000, the BOOMERanG and Maxima cosmic microwave background experiments observed the first acoustic peak in the CMB, showing that the total (matter+energy) density is close to 100% of critical density. Then in 2001, the 2dF Galaxy Redshift Survey gave strong evidence that the matter density is around 30% of critical. The large difference between these two supports a smooth component of dark energy making up the difference. Much more precise measurements from WMAP in 2003-2010 have continued to support the standard model and give more accurate measurements of the key parameters.

The term "dark energy", echoing Fritz Zwicky's "dark matter" from the 1930s, was coined by Michael Turner in 1998.[54]

As of 2013, the Lambda-CDM model is consistent with a series of increasingly rigorous cosmological observations, including the Planck spacecraft and the Supernova Legacy Survey. First results from the SNLS reveal that the average behavior (i.e., equation of state) of dark energy behaves like Einstein's cosmological constant to a precision of 10%.[55] Recent results from the Hubble Space Telescope Higher-Z Team indicate that dark energy has been present for at least 9 billion years and during the period preceding cosmic acceleration.

History of the telephone

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