Imam Ayatollah Seyed Ruhollah Musavi Khomeini (May 17, 1900 – June 3, 1989) was a Muslim cleric and Marja, and the political leader of the 1979 Islamic Revolution of Iran which overthrew Mohammad Reza Pahlavi, the last Shah of Iran. Following the Revolution, Imam Khomeini became Grand Leader of Iran — the paramount figure in the political system of the new Islamic Republic — until his demise.
Imam Khomeini was considered a Marja-e taqlid to many Muslims, and in Iran was officially addressed as Imam and his supporters adhere to this convention. Imam Khomeini was also a highly-influential and innovative Islamic political theorist, most noted for his development of the theory of velayat-e faqih, the "guardianship of the jurisconsult."
Only two weeks after the Shah fled Iran on January 16, 1979, Imam Khomeini returned to Iran triumphantly, on Thursday, February 1, 1979, invited by the anti-Shah revolution which was already in progress.
Conservative estimates put the welcoming crowd of Iranians at least three million. When Imam Khomeini was on plane on his way to Iran after many years in exile, a reporter, Peter Jennings asked him: "What do you feel?" and surprisingly Imam Khomeini answered "Nothing!"
In a speech given to a huge crowd on the first day of returning to Iran, Imam Khomeini attacked the regime of Shapoor Bakhtiar promising "I shall punch their teeth in." He also made a variety of promises to Iranians for his coming Islamic government: A popularly elected government that would represent the people of Iran.
Imam Khomeini established an Islamic Republic system in Iran which changed the balance of power in the interest of oppressed people of the world and brought about progress for Iran from all perspectives.