The Green Knight 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 alternate 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". In Sir Gawain and the Green Knight, Bercilak is transformed into the Green Knight by Morgan le Fay, a traditional adversary of King Arthur, in order to test his court. In The Green Knight he is transformed by a different woman for the same purpose. In both stories he sends his wife to seduce Gawain as a further test. "King Arthur and King Cornwall" portrays him as an exorcist and one of the most powerful knights of Arthur's court.