Mohammad Reza Pahlavi was the last Shah of Iran from 1941 to 1979. He succeeded his father Reza Shah and ruled the Imperial State of Iran until he was overthrown in the Islamic Revolution led by Ruhollah Khomeini, which abolished the Iranian monarchy to establish the Islamic Republic of Iran. In 1967, he took the title Shahanshah, and held several others, including Aryamehr and Bozorg Arteshtaran. He was the second and last ruling monarch of the Pahlavi dynasty.