He slept with Guinivere.(Arthur thinks they do!)
Sir lancelot and Guinevere betrayed King Arthur because of the extreme romance they have they had an affair and ran away together
She betrayed the king by having an affair with Sir Lancelot.
Guinevere betrayed her husband Arthur by having an affair with Lancelot, a knight of the Round Table and Arthur's close friend.She had an adulterous affair with Sir Lancelot.
Sir Lancelot and Guinevere betrayed Arthur by having an affair and running away from him.
Lancelot is in love with king Arthur's wife gwenivere. He doesnt want to betray the King because he trusts him and makes him a knight of the round table but he wants to be with gwenivere. Later the two are found kissing and Arthur punishes them both.
Arthur did not kill Lancelot, for Arthur died before Lancelot died.
King Arthur's best knight was Lancelot
Sir Lancelot
Lancelot
king arther was married to Guinevere and she was cheating on him with Lancelot.
Sir Lancelot and King Arthur.
He hung him