Lansansissa
Brother of Escorducarla, a sorceress whose daughter was slain by Arthur.
To revenge herself on the king, Escorducarla gave Lasancis enchanted weapons and armor, and told him to go to Arthur’s court. Lasancis planned to defeat each knight, including Arthur, place them in a prison, and burn the prison. Tristan, the last knight to face Lasancis, managed to steal his magic lance and to overcome his magic armor with a heavy mace. Lasancis surrendered and was imprisoned for the rest of his life.
See also
Hidden Island | The Legend of King Arthur
Sources
La Tavola Ritonda | 1325–1350
Cantare dei Cantari | Anonymous, possibly Antonio Pucci, c. 1380