Muhammad Ali, one of the greatest boxers of all time, was born in Louisville, Kentucky with the name Cassius Marcellus Clay, Jr. He was the first fighter to win the world heavyweight championship on three separate occasions, a title which he defended 19 times. Shortly after becoming heavyweight champion, he announced that he was a member of the Nation of Islam, and changed his name to Muhammad Ali. In the 1980s, shortly after his retirement from boxing, he was diagnosed with Parkinson's disease. Although he retired form boxing, he devoted his time to charity activities. In 1999, Sports Illustrated awarded him the title "Sportsman of the Century."