Sir Lancelot goes to the rescue of Urgan the Strong, whose castle is besieged by Sir Melius the Mighty and his two sons. Sir Lancelot drives off the invaders, and Urgan offers his daughter Igrane in marriage to the knight as a reward for his bravery.

Sir Lancelot se porte au secours d'Urgan le Fort, dont le château est assiégé par Sir Melius le Puissant et ses deux fils. Sir Lancelot chasse les envahisseurs et Urgan offre sa fille Igrane en mariage au chevalier en récompense de sa bravoure.