The term 'Ring King' refers to three legendary boxers: Muhammad Ali (3 letters), Joe Louis (5 letters), and Jack DEMPSEY (7 letters). Muhammad Ali was a three-time world heavyweight champion, widely considered one of the greatest boxers of all time. Joe Louis was a world heavyweight champion from 1937 to 1949, and is considered one of the greatest heavyweights of all time. Jack DEMPSEY was a world heavyweight champion from 1919 to 1926, and is considered one of the most iconic figures in boxing history. Together, these three boxers are known as the Ring Kings.