The answer is D: Bertilak of hautdesert. He is a good-natured lord of the castle where Sir Gawain spends the Christmas. Bertilak represents the courtly behavior of an aristocratic host. He is powerful, brave and generous. Its not until the end we find out that Bertilak and the Green Knight are the same person. Sir Gawain and the Green Knight is a late 14th century Middle English chivalric romance. It is the one of the best known stories from the Arthurian era. Its plot combines two types of folklore motifs, the beheading game and the exchange of winnings. The story speaks about King Arthur's Round Table Knight Sir Gawain, who accepts the challenges from a mysterious "Green Knight".