Muhammad Ali was the first person to become heavyweight champion of the world three times.
Born Cassius Clay in 1942, he won Olympic Gold in Rome aged 18 and floored Sonny Liston to shake up the world in 1964.
Then heavyweight champion, he became Muhammad Ali and would dominate the division for more than a decade - minus his three-year exile for refusing to fight in the Vietnam war - beating the likes of Joe Frazier, Ken Norton and George Foreman.
Here, Sportsmail looks back at the life of one of the most remarkable men to walk the planet...
Muhammad Ali knocks out British challenger Richard Dunn in the fifth round of their fight in Munich in May 1976





