(1978-1979) a revolution against the shah of Iran led by the Ayatollah Ruhollah Khomeini, which resulted in Iran becoming an Islamic Republic with Khomeini as its leader, the revolution that transformed Iran from a monarchy under Shah Mohammad Reza Pahlavi to an Islamic republic under Ayatollah Ruhollah Khomeini, Mullahs (religious leaders) overthrow the US backed Shah and establish a theocracy (religious government) that hated the US, Many Iranians opposed Reza Shah Pahlavi, there was also a hatred of Westernization. There was a revival in Islam, and Ayatollah Khomeini soon emerged as the religious opposition to the Shah. He organized demonstrations and riots, and the Shah eventually left. Khomeini then seized power in Iran.