<human>:  Who was Muhammad Ali?
<bot>: Muhammad Ali was a famous boxer who won the heavyweight boxing championship three times. Ali was born Cassius Clay in Louisville, Kentucky, and became the first African American heavyweight champion of the world in 1964. He is widely considered one of the greatest boxers of all time, and he was also a civil rights activist. Ali was diagnosed with Parkinson's disease in 1984 and died in 2016.