A castle where, during the Grail Quest, a rally was held against the Knights of the Round Table.
Tristan unwittingly arrived in the middle of it, killed the king’s brother, and was set upon by one hundred knights. Palamedes (Palomides) and Galahad arrived, rescued him, and humbled the king.
Source
Post-Vulgate Queste del Saint Graal | 1230-1240