The 444 days, from November 1979-January 1981, in which American embassy workers were held captive by Iranian revolutionaries. The Iranian Revolution began in January 1979 when young Muslim Fundamentalists overthrew the oppressive regime of the American-backed shah, forcing him into exile. Deeming the United States "the Great Satan," these revolutionaries triggered an energy crisis by cutting off Iranian oil. The hostage crisis began when revolutionaries stormed the American embassy, demanding that the United States return the shah to Iran for trial. The episode was marked by botched diplomacy and a failed rescue attempt by the Carter administration. After permanently damaging relations between the two countries, the crisis ended with the hostages' release the day Ronald Reagan became president, January 20, 1981.