Nat Langham was a mid-1800s bare-knuckle boxer.
According to the An Illustrated History of Boxing (6th Edition), pp. 43, 215, Langham, born in Leicestershire in 1820, was the middleweight champion from 1843 to 1857. Harry Orme was the only man to have defeated him--taking 117 rounds and three hours.
Langham is a 1992 inductee into the International Boxing Hall of Fame.