The Green Knight (Welsh: Marchog Gwyrdd, Cornish: Marghek Gwyrdh, Breton: Marc'heg Gwer) is a character from the 14th-century Arthurian poem Sir Gawain and the Green Knight and the related medieval work The Greene Knight. His true name is revealed to be Bertilak de Hautdesert (an alternative spelling in some translations is "Bercilak" or "Bernlak") in Sir Gawain, while The Greene Knight names him "Bredbeddle". The Green Knight later features as one of Arthur's greatest champions in the fragmentary ballad "King Arthur and King Cornwall", again with the name "Bredbeddle".