Castle of Treachery, Felon Castle
A pagan stronghold ruled by Arpian.
The castle imprisoned maidens and slew any knight of Arthur, whom Arpian hated. The Lady of the Treacherous Castle suffered from a disease and could only be cured by the blood of a virgin princess. Lancelot visited the castle but could not end the custom. When Arpian imprisoned Galahad, Hector, and Meraugis during the Grail Quest, the castle was destroyed by a holy cataclysm.
Arthur kept trying to rebuild it but could not. Much later, Charlemagne successfully reconstructed it and erected a statue of Galahad out front.
Lomblanda | The Legend of King Arthur