By the mid-1970s, relying on increased oil revenues, Mohammad Reza began a series of even more ambitious and bolder plans for the progress of his country and the march toward the “White Revolution”. But his socioeconomic advances increasingly irritated the clergy. Islamic leaders, particularly the exiled cleric Ayatollah Ruhollah Khomeini, were able to focus this discontent with an ideology tied to Islamic principles that called for the overthrow of the Shah and the return to Islamic traditions, called the Islamic revolution.