{gah'-win} In the Arthurian legends Sir Gawain was King Arthur's nephew, the son of King Lot of Orkney and Morgawse. Sir Gawain and the Green Knight, a 14th-century romance, is the most famous legend about him. His name and some of his attributes suggest that he was identified with or related to the Celtic sun deity. (c) 1997 Grolier, Inc.