"Be of good cheer," said Sir Lancelot; "it shall not lie within his power to harm thee."
"Sir," said the knight, "I will be ruled as ye will have me."
So Sir Lancelot rode between the knight and the lady. And when they had ridden awhile, the knight cried out suddenly to Sir Lancelot to turn and see what men they were who came riding after them; and while Sir Lancelot, thinking not of treason, turned to look, the knight, with one great stroke, smote off the lady's head.
Then was Sir Lancelot passing wroth, and cried, "Thou traitor! Thou hast shamed me forever!" and, alighting from his horse, he drew his sword to have slain him instantly; but the knight fell on the ground and clasped Sir Lancelot's knees, and cried out for mercy. "Thou shameful knight," answered Lancelot, "thou mayest have no mercy, for thou showedst none, therefore arise and fight with me."
"Nay," said the knight, "I will not rise till thou dost grant me mercy."
"Now will I deal fairly by thee," said Sir Lancelot; "I will unarm me to my shirt, and have my sword only in my hand, and if thou canst slay me thou shalt be quit forever."
"That will I never do," said the knight.
"Then," answered Sir Lancelot, "take this lady and the head, and bear it with thee, and swear to me upon thy sword never to rest until thou comest to Queen Guinevere."
"That will I do," said he.
"Now," said Sir Lancelot, "tell me thy name."