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Archeological findings have placed knowledge of Iranian prehistory at middle paleolithic times (100,000 years ago). The earliest sedentary cultures date from 18,000-14,000 years ago. The sixth millennium BC saw a fairly sophisticated agricultural society and proto-urban population centers. Many dynasties have ruled Iran, the first of which was under the Achaemenids (559 - 330 BC), a dynasty founded by Cyrus the Great. After the Hellenistic period (300 - 250 BC) came the Parthian (250 BC - AD 226 ) and the Sassanid (226 - 651) dynasties.
The seventh century Arab-Muslim conquest of Iran was followed by conquests by the Seljuk Turks, the Mongols, and Tamerlane. Iran underwent a revival under the Safavid dynastyThe Safavids are regarded as the greatest Persian dynasty since the Arab conquest of Iran some eight hundred years earlier. The Safavid kingdom was established in northern Iran in 1501 and grew to an Empire during the following hundred years. At its Zenit (1502-1736), the most prominent figure of which was Shah Abbas IShah Abbas I ( January 27, 1571 January 19, 1629?) was the most eminent ruler of the Safavid Dynasty. He was also known as Shah Abbas the Great . In early October, 1588 he became shah, by revolting against his father, Mohammad of Safavid, and imprisoning. The conqueror Nadir ShahNadir Shah Nadir Qoli Beg ( October 22, 1688 June, 1747) was a Shah of Persia who ruled 1736- 1747 and who was the founder of the Afsharid dynasty. He has sometimes been described as the Persian Napoleon . He was born in the Dastgerd region of Khorasan (n and his successors were followed by the Zand dynastyThe Zand dynasty ruled southern and central Iran in the eighteenth century. The dynasty was formed by Karim Khan Zand, chief of the Zand tribe of Lurs who had previously been moved by Nader Shah to eastern Iran, but had returned after the death of the lat, founded by Karim KhanKarim Khan Zand ( Persian: ) was a king of Persia who reigned from 1760 until 1779. After Nadir Shah's death in 1747, Persia was entered into a civil war. At that time Karim Khan, Abdolfath Khan and Ali Mardan Khan reached an agreement to divide the count, and later the QajarThe Qajar dynasty was the ruling family of Persia from 1796 to 1925. The dynasty was founded in 1796 by Agha Muhammad Khan, a eunuch who defeated the last ruler of the Zand dynasty but was himself assassinated only a year later. During the Qajar period Pe (1795-1925) and the PahlaviThe Pahlavi dynasty was the ruling dynasty of Iran from 1925 to 1979, from which two Shahs were drawn. Reza Pahlavi and the start of the dynasty In 1921 Reza Khan (later Reza Shah Pahlavi), an officer in Iran's only military force (Cossack Brigade) used h dynasties (1925-1979).
Modern Iranian history began with a nationalist uprising against the Shah (who remained in power) in 1905, the granting of a limited constitution in 1906 (making the country a constitutional monarchy), and the discovery of oil in 1908. The key to the region was the British discovery of oil, see William Knox D'Arcy and British Petroleum. Control of the region was disputed between the United Kingdom and Russia, codified in an agreement of 1907 dividing the region into spheres of influence.