Muhammad Ali was an American professional boxer and activist
He was born on January 17, 1942 in Louisville, Kentucky
His real name was Cassius Marcellus Clay Jr.
He was Nicknamed as "The Greatest"
He began training as an amateur boxer at age 12
He is regarded as one of the most significant sports figure
He was ranked as the greatest heavyweight boxer of all time
He was named Sportsman of the Century by Sports Illustrated
He was named Sports Personality of the Century by the BBC