Muhammad Umar Mujahid (1959 – 23 April 2013), commonly known as Mullah Omar or Muhammad Omar, was an Afghan militant leader who served as the first supreme leader of Afghanistan from 1996 to 2001. He founded the Taliban in 1994 and served as its first supreme leader until his death in 2013. During the Third Afghan Civil War, the Taliban fought the Northern Alliance and took control of most of the country, establishing its First Islamic Emirate. Shortly after al-Qaeda carried out the September 11 attacks, the Taliban government was toppled by an American invasion of Afghanistan, prompting Omar to go into hiding; he successfully evaded capture by the American-led coalition before dying in 2013 from tuberculosis.
Born into a religious family in Kandahar, Omar was educated at local madrasas in Afghanistan. After Afghanistan was invaded by the Soviet Union in 1979, he joined the Afghan mujahideen to fight in the Soviet–Afghan War and he was trained by Amir Sultan Tarar. He served as an important rebel commander during several skirmishes, losing his right eye in an explosion. The Soviets eventually withdrew from the country in 1989 and Afghanistan's Soviet-backed Democratic Republic was toppled in 1992, triggering the Second Afghan Civil War. While initially remaining quiet and focused on continuing his studies, Omar became increasingly discontent with what he perceived as fasād in the country, ultimately prompting him to return to fighting in the Civil War.