In boxing, a triple champion is a boxer who has won world titles in three weight classes. For most of the 20th century it was a remarkable and rare achievement accomplished by only a handful of fighters. Beginning in the 1970s, triple champions have become increasingly more common due to the proliferation of weight classes and sanctioning bodies in the sport. Bob Fitzsimmons was boxing's first triple champion, successively winning the middleweight, heavyweight and light-heavyweight titles between 1894 and 1903.