Kenneth Howard Norton Sr. (born August 9, 1943, Jacksonville, Illinois

Jacksonville, Illinois

Jacksonville is a city in Morgan County, Illinois, United States. The population was 18,940 at the 2000 census. It is the county seat of Morgan County....

) is a former heavyweight boxer. He is best known for his 12-round victory over a peak Muhammad Ali

Muhammad Ali

Muhammad Ali is an American former professional boxer, philanthropist and social activist...

 where he famously broke Ali's jaw, on March 31, 1973, becoming only the second man to defeat Ali as a professional (after Joe Frazier, who won a 15-round unanimous decision against Ali on March 8, 1971).

He and Ali would fight twice more in their trilogy

Trilogy

A trilogy is a set of three works of art that are connected, and that can be seen either as a single work or as three individual works. They are commonly found in literature, film, or video games...

, with Ali officially winning narrowly both returns, although many felt Norton truly deserved their 3rd fight.