Answer
The impeachment of Abolhassan Banisadr, Iran's first president, occurred in 1981. It was the culmination of a power struggle between Banisadr and the country's religious leadership, led by Ayatollah Ruhollah Khomeini. The parliament voted to impeach Banisadr on charges of incompetence and treason, effectively removing him from office and paving the way for the eventual consolidation of power by Khomeini and the clerical establishment.