Mir-Hossein Mousavi is an Iranian politician and architect, best known for serving as the last Prime Minister of Iran from 1981 to 1989. He was a key figure during the Iranian Revolution and played a significant role in shaping the country's early post-revolutionary policies. In 2009, Mousavi became a prominent leader of the opposition during the Iranian presidential election, which was marred by allegations of fraud. His supporters rallied under the banner of the Green Movement, advocating for political reform and greater civil liberties in Iran.