The legendary marshal in question is Wyatt Earp, an American Old West lawman and gambler. He is most famous for his involvement in the Gunfight at the O.K. Corral, during which he and his brothers Morgan and Virgil faced off against the Clanton-McLaury gang. Earp was also a deputy U.S. Marshal and a deputy sheriff in various Western frontier towns. He was known for his strong sense of justice and his willingness to take on dangerous criminals.