So King Mark came into England, where he soon became known as the most horrible coward that ever bestrode horse; and there was much laughing and jesting at the knight of Cornwall, and much he was despised. Sir Dagonet, King Arthur's fool, at one time chased him through thick and thin over the forests; and when on a day Sir Launcelot overtook him and bade him turn and fight, he made no defence, but tumbled down out off the saddle to the earth as a sack, and there he lay still, and cried Sir Launcelot mercy. So King Mark was soon brought as recreant before King Arthur, who already knew wherefore he was come into his country, and that he had not done the service and homage he owed as King Arthur's under-lord. But King Mark promised to make large amends for the wrongs he had done, for he was a fair speaker, and false thereunder. So on a day King Arthur prayed of him one gift, and King Mark promised to give him whatsoever he desired, if it were in his power. Then King Arthur asked him to be good lord unto Sir Tristram, and to take him back into Cornwall, and to cherish him for Arthur's sake. King Mark promised this, and swore upon a book afore Arthur and all his knights. Therewith King Arthur forgave him all the evil will that ever he owed him, and King Mark and Sir Tristram took either other by the hands hard knit together. But for all this King Mark thought falsely, as it proved afterward. Then soon afterward King Mark took his leave to ride into Cornwall, and Sir Tristram rode with him; wherefore the most part of the Round Table were passing heavy, and some were wroth, knowing that King Mark was the most coward and the villainest knight living. After a while letters came out of Cornwall that spake ill of Sir Tristram and showed plainly that King Mark took Sir Tristram for his mortal enemy. Sir Launcelot in especial made great sorrow for anger, wherefore Dinadan, a gentle, wise, and courteous knight, said to him: "King Mark is so villainous that by fair speech shall never man get of him. But ye shall see what I shall do. I will make a lay for him, and when it is made I shall make a harper sing it afore him." So anon Dinadan went and made the lay, hoping thereby to humble the crafty king; and he taught it an harper named Eliot, and when he knew it, he taught it to many harpers. And so, by the will of Sir Launcelot and of Arthur, the harpers went straight into Wales and into Cornwall, to sing the lay that Sir Dinadan made of King Mark, which was the worst lay that ever harper sang with harp or with any other instrument.