The Iranian Revolution also known as the Islamic Revolution or the 1979 Revolution, was a series of events that involved the overthrow of the last monarch of Iran, Mohammad Reza Shah Pahlavi, and the replacement of his government with an Islamic republic under the Grand Ayatollah Ruhollah Khomeini, a leader of one of the factions in the revolt. The movement against the United States-backed monarchy was supported by various leftist and Islamist organizations and student movements.