Answer
Floyd Patterson was the world heavyweight champion twice, from 1956 to 1959, and again from 1960 to 1962. He was the youngest man to win the title at the age of 21, and he held it for three years before being defeated by Ingemar Johansson. Patterson regained the title in a rematch with Johansson, but he lost it again in a rematch with Sonny Liston.