Portleguez
A Welsh castle where, according to the Post-Vulgate Queste del Saint Graal, Merlin’s mother died.
It was the surname of Arthur’s knight Meraugis, who apparently had no association with the castle, but instead took the name from another knight.
Sources
Meraugis de Portlesquez | Raoul de Houdenc, early 13th century
Le Livre d’Artus | Early 13th century
Post-Vulgate Queste del Saint Graal | 1230-1240