Khomeini was an Iranian Shia Muslim religious leader and politician who led the 1979 Iranian Revolution that overthrew the monarchy of Shah Mohammad Reza Pahlavi and established an Islamic Republic in Iran. Khomeini served as the Supreme Leader of Iran from 1979 until his death in 1989. He was known for his opposition to Western influence in Iran and for promoting Islamic fundamentalism.The Islamic Revolution in Iran, led by Ayatollah Khomeini, was a pivotal moment in the history of not only Iran but the entire Middle East. The revolution, which took place in 1979, overthrew the Pahlavi monarchy and established an Islamic republic in its place.