American heavyweight boxer born Cassius Clay in Louisville…

American heavyweight boxer born Cassius Clay in Louisville, Kentucky, in 1942. He won Olympic gold in Rome in 1960 and stunned Sonny Liston to take the world title in 1964. Famous for floating like a butterfly and stinging like a bee, he beat George Foreman in the Rumble in the Jungle, fought Joe Frazier in the Thrilla in Manila and lit the Olympic cauldron at the Atlanta Games in 1996.

The answer in 11 letters