A fortress in the country of Listenois.
Tristan killed Lucanoro, the son of its castellan, during the Grail Quest. Tristan later happened upon the castle looking for lodging. When the castellan realized the identity of his visitor, he seized him and planned to execute him. Palamedes (Palomides) caught them in the act and saved Tristan, killing the castellan and his company. Palamedes took control of the castle.
Source
La Tavola Ritonda | 1325–1350