A fortress visited by Lancelot.
Any knight who entered had to propose marriage to the castellan’s daughter and then try to pull a spear out of a pillar. All knights failed, and were beheaded by the castle’s lord. Lancelot alone succeeded, which enraged the castellan so much that he threw Lancelot into his prison. The daughter helped Lancelot escape past the fierce griffin guards.
Source
Perlesvaus | Early 13th century