Tavola opens with a tournament, held by Uther, at the castle. Guinevere holed herself up in the castle when Mordred usurped Arthurís throne. Arthur, returning from his attack on Lancelot in Benoic (Benwick), engaged Mordred at the castle.
During the battle, Yvain was slain and Arthur received his mortal wound - an event that traditionally occurs at Camlann. In response to a summons from Guinevere, Lancelot came from France and killed Mordred in front of the castle.