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The history of Iran, commonly also known as Persia in the Western world, is intertwined with the history of a larger region, also to an extent known as Greater Iran, comprising the area from Anatolia, the Bosphorus, and Egypt in the west to the borders of Ancient India and the Syr Darya in the east, and from the Caucasus and the Eurasian Steppe in the north to the Persian Gulf and the Gulf of Oman in the south.

Iran is home to one of the world's oldest continuous major civilizations, with historical and urban settlements dating back to 7000 BC.[1] The southwestern and western part of the Iranian Plateau participated in the traditional Ancient Near East with Elam, from the Early Bronze Age, and later with various other peoples, such as the Kassites, Mannaeans, and Gutians. Georg Wilhelm Friedrich Hegel calls the Persians the "first Historical People".[2] The Medes unified Iran as a nation and empire in 625 BC.[3] The Achaemenid Empire (550–330 BC), founded by Cyrus the Great, was the first Persian empire and it ruled from the Balkans to North Africa and also Central Asia, spanning three continents, from their seat of power in Persis (Persepolis). It was the largest empire yet seen and the first world empire.[4] The First Persian Empire was the only civilization in all of history to connect over 40% of the global population, accounting for approximately 49.4 million of the world's 112.4 million people in around 480 BC.[5] They were succeeded by the Seleucid, Parthian, and Sasanian Empires, who successively governed Iran for almost 1,000 years and made Iran once again as a leading power in the world. Persia's arch-rival was the Roman Empire and its successor, the Byzantine Empire.

The Persian Empire proper begins in the Iron Age, following the influx of Iranian peoples. Iranian people gave rise to the Medes, the Achaemenid, Parthian, and Sasanian Empires of classical antiquity.

Once a major empire, Iran has endured invasions too, by the Greeks, Arabs, Turks, and the Mongols. Iran has continually reasserted its national identity throughout the centuries and has developed as a distinct political and cultural entity.

The Muslim conquest of Persia (633–654) ended the Sasanian Empire and is a turning point in Iranian history. Islamization of Iran took place during the eighth to tenth centuries, leading to the eventual decline of Zoroastrianism in Iran as well as many of its dependencies. However, the achievements of the previous Persian civilizations were not lost, but were to a great extent absorbed by the new Islamic polity and civilization.*

Iran, with its long history of early cultures and empires, had suffered particularly hard during the late Middle Ages and the early modern period. Many invasions of nomadic tribes, whose leaders became rulers in this country, affected it negatively.[6]

Iran was reunified as an independent state in 1501 by the Safavid dynasty, which set Shia Islam as the empire's official religion,[7] marking one of the most important turning points in the history of Islam.[8] Functioning again as a leading power, this time amongst the neighboring Ottoman Empire, its arch-rival for centuries, Iran had been a monarchy ruled by an emperor almost without interruption from 1501 until the 1979 Iranian Revolution, when Iran officially became an Islamic republic on April 1, 1979.[9][10]

Over the course of the first half of the 19th century, Iran lost many of its territories in the Caucasus, which had been a part of Iran for centuries,[11] comprising modern-day Eastern Georgia, Dagestan, Azerbaijan, and Armenia, to its rapidly expanding and emerged neighboring rival, the Russian Empire, following the Russo-Persian Wars between 1804–13 and 1826–8.[12]

Prehistory