The malevolent lord of Fors Graviers, an Irish castle.
Gawain happened to visit Gaudionés castle on his way to conquer the castle Rigomer. Gaudionés, knowing of Gawain’s prowess, sent a group of maidens to disarm him, knowing that Gawain would not attack them. He threw Gawain in a prison, instructing his sister to torture and starve the knight. Gaudionés’s sister, however, helped Gawain to escape.
Gawain later encountered Gaudionés, defeated him, and took him prisoner.
See also
Lorie | The Legend of King Arthur
Source
Les Merveilles de Rigomer | Jehan, mid to late 13th century