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 dynasty (1502-1736), the most prominent figure of which was Shah Abbas. The conqueror Nadir Shah and his successors were followed by the Zand dynasty, founded by Karim Khan, and later the Qajar (1795-1925) and the Pahlavi dynasties (1925-1979).