[W, victor, son of scorcher].
Eternal combatant with Gwynn ap Nudd. Gwythyr was the intended of the beautiful Creiddylad, daughter of Lludd Llaw Erient when Gwyn abducted her before the lovers could sleep together. Gwynn defeated Gwythyr's rescuing force and treated some of Gwythyr's retainers most savagely. So bitter was the enmity between the two men that Arthur condemned them to do battle with one another each Calan Mai [May Day] until doomsday.