After Shah Mohammed Reza Pahlavi left on January 16, 1979,
control of the government fell to his Prime Minister Shahpour
Bakhtiar, who continued to rule until February 11, 1979. Iran was
then ruled by an interim government headed by Mehdi Bazargan as
Prime Minister until his resignation on November 6, 1979 in protest
of the attack on the US Embassy (which he believed were brutish
actions unbefitting of Iranians). With Bazargan's resignation, the
Islamists led by Ruhollah Khomeini swept into power and began to
rule the country.