A fierce king.
Gawaine visited his court seeking the king’s maiden daughter, Ysabele, whom Gawaine needed as part of an elaborate series of quests designed to obtain the magical Floating Chessboard from King Wonder.
Assentin imprisoned Gawaine and told his daughter to care for the knight. Later finding the two in flagrante, Assentin threw them both in his dungeon, from which they were rescued by the ghost of a knight Gawaine had slain.
Source
Roman van Walewein | Penninc and Pieter Vostaert, mid to late 13th century