"King of the World" is a biography of boxer Muhammad Ali written by David Remnick, published in 1998. The book traces Ali's life from his childhood in Louisville, Kentucky, to his rise to fame as the heavyweight champion of the world, to his conversion to Islam and his political activism during the Vietnam War. Remnick explores Ali's unique personality and his impact on American culture, as well as the cultural and historical context of the civil rights movement and the Vietnam War era. The book also provides detailed accounts of some of Ali's most famous fights, including his legendary bouts against Sonny Liston, Joe Frazier, and George Foreman. "King of the World" is a rich and engrossing portrait of one of the most iconic figures in 20th-century American history.