Two entries with the name Brion.
Brion
Brions
A castle in France near the home of the Lady of the Lake. It was separated from the castle Charosque by the forest of Briosque.
Source
Vulgate Lancelot | 1215-1230
Brion
A castle belonging to Alain of Escavalon.
Alain once lodged Gawaine at the castle, and Gawaine slept with Alain’s daughter, Florée, begetting a son.
Source
Le Livre d’Artus | Early 13th century