His kingdom is situated in the Berry and is named "Terre Deserte", or "Land Laid Waste", so called because of the destruction Uther Pendragon had wrought there.
[1] Claudas appears as the Round Table's adversary in Perlesvaus, the Vulgate and Post-Vulgate Cycles, and Malory's Le Morte d'Arthur.
He wages war on Kings Ban and Bors in the early period of Arthur's reign, and succeeds in conquering many of their lands.
When they are older, Lionel and Bors kill Claudas' son Dorin, but escape to join their cousin with the Lady of the Lake.
Years later, after Claudas has imprisoned a cousin of Guinevere's, Arthur, Bors and Lionel decide to settle the score for good.