A castle on the island of Perfida, visited by Tristan (Tristram) and a maiden named Tessina during Tristanís adventures in Logres.

Tristan was imprisoned and forced to fight the castleís champion, Lamorat. Lamorat had assumed the position after slaying the previous champion. By custom of the castle, one of the two knights would have to die in the combat, but Tristan feigned death and they were both able to escape later.

Tessina was beheaded because her beauty did not match that of Medeas, the castleís pagan queen.