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Muhammad Ali (born Cassius Marcellus Clay, Jr.; January 17, 1942) is a former American boxer and three-time World Heavyweight Champion, who is widely considered one of the greatest heavyweight championship boxers. As an amateur, he won a gold medal in the light heavyweight division at the 1960 Summer Olympics in Rome. After turning professional, he went on to become the first boxer to win the lineal heavyweight championship three times.

Originally known as Cassius Clay, Ali changed his name after joining the Nation of Islam in 1964, subsequently converting to Islam in 1975 and more recently to Sufism. In 1967, Ali refused to be conscripted into the U.S. military, based on his religious beliefs and opposition to the Vietnam War. He was arrested and found guilty on draft evasion charges, stripped of his boxing title, and his boxing license was suspended. He was not imprisoned, but did not fight again for nearly four years while his appeal worked its way up to the U.S. Supreme Court, where it was successful.

Nicknamed "The Greatest", Ali was involved in several historic boxing matches. Notable among these are three with rival Joe Frazier and one with George Foreman, whom he beat by...