Ali, originally known as Cassius Clay, began training at 12 years old and at the age of 22 won the world heavyweight championship in 1964 from Sonny Liston in a stunning upset. Shortly after that bout, Ali joined the Nation of Islam and changed his name. He converted to Sunni Islam in 1975, and 30 years later began adhering to Sufism.
In 1967, three years after winning the heavyweight title, Ali refused to be conscripted into the
Ali remains the only three-time lineal world heavyweight champion; he won the title in 1964, 1974, and 1978. Between February 25, 1964 and September 19, 1964 Muhammad Ali reigned as the undisputed heavyweight boxing champion.
Nicknamed "The Greatest", Ali was involved in several historic boxing matches. Notable among these were the first Liston fight, three with rival Joe Frazier, and one with George Foreman, in which he regained titles he had been stripped of seven years earlier.
At a time when most fighters let their managers do the talking, Ali, inspired by professional wrestler "Gorgeous" George Wagner, thrived in—and indeed craved—the spotlight, where he was often provocative and outlandish. He controlled most press conferences and interviews, and spoke freely about issues unrelated to boxing. Ali transformed the role and image of the African American athlete in
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