Ile sans Nom
An enchanted island whose resident, a sorceress, bewitched unsuspecting knights to defend the island against all visitors. Gawain, who came to the island seeking the Sword with the Strange Hangings, was one of her victims. Trapped on the island, he was forced to fight his friend, Sir Meraugis. He was finally able to escape by feigning death.
Source
Meraugis de Portlesquez | Raoul de Houdenc, early 13th century