Guinas de Blakestan
A cruel and arrogant knight. His cousin Ladomas accidentally slipped into bed with Guinas’s lady, and Guinas attacked him for this mistake, nearly killing him. Guinas then rejected his own paramour.
Arthur’s Sir Hector came along in the middle of this, and Guinas – in a foul temper – pressed him into combat. Hector defeated Guinas twice and refrained from killing him so that Guinas could be reconciled with his lady and cousin.
Sources
Lancelot do Lac | 1215-1220
Vulgate Lancelot | 1215-1230