A young boy named Cassius Clay A teenager who learned to float like a butterfly and sting like a bee The “greatest” heavyweight boxing champion of all time Cassius Marcellus Clay, Jr. won the world heavyweight championship at the age of 22, the same year he joined the Nation of Islam and changed his name to Muhammad Ali. He would go on to become the first and only three-time (in succession) World Heavyweight Champion. Nicknamed “The Greatest,” Ali was as well known for his unique boxing style, c ...