Madaglan

The pagan king of Oriande in Perlesvaus.

He was related somehow to Guinevere, and he challenged Arthur for possession of the Round Table after Guinevere's death. He tried to convince Arthur to marry his sister, Jundree, but Arthur refused to marry a heathen.

Madaglan invaded Scotland, but Arthur's soldiers, led by Lancelot, repelled them. Madaglan invaded a second time, and Arthur's warriors, under Brien of the Isles (Brian of the Isles), were unable to defeat him. A second campaign by Lancelot resulted in Madaglan's death, and Oriande was converted to Christianity.

Madaglan's tale, particularly his demand that Arthur relinquish the Round Table, echoes the False Guinevere ('Genievre') episode in the Vulgate Lancelot, in which Madaglan's counterpart would be Bertelay.