1) In 1935, Iran's ruler insisted the country's name be changed from Persia to Iran.
2) In 1979, widespread demonstrations and unrest led to the overthrow of the Shah and the establishment of an Islamic republic under Ayatollah Khomeini.
3) The Iranian Revolution transformed Iran from a pro-Western monarchy to a populist theocratic republic led by clerics, with the Ayatollah serving as the Supreme Leader.