A castle ruled by the mighty warrior Laamorz. The castle had the power to render any knight who entered helpless to Laamorz’s will.
Gawain was led there through the deception of a malevolent goddess named Giramphiel, but advice given by Lady Fortune allowed Gawain to avoid the enchantment and to defeat Laamorz in single combat.
Source
Diu Crône | Heinrich von dem Türlin, c. 1230