Castel de la Roce
In the Third Continuation of Chrétien’s Perceval, a castle ruled by Silimac of the Rock, a knight killed while traveling with Gawain.
In the Prose Tristan, a castle by this name is on the border between Lyonesse and Cornwall.
Sources
Prose Tristan | 1230-1240
Third Continuation of Chrétien’s Perceval | Manessier, c. 1230