Ruhollah Musavi Khomeini was an Iranian Islamic revolutionary, politician and religious leader who served as the first Supreme Leader of Iran from 1979 until his death in 1989. He was the founder of the Islamic Republic of Iran and the main leader of the Iranian Revolution, which overthrew Mohammad Reza Pahlavi and ended the Iranian monarchy. Ideologically a Shia Islamist, Khomeini's religious and political ideas are known as Khomeinism.