But Arthur, when he was come back to Camelot, sent for Sir Launcelot and other of his knights, bidding them seek for such an one as was Sir Tristram and bring him to the court. So they departed, each his own way, and searched for many days, but in vain. Then it chanced, at last, as Sir Launcelot rode on his way, he espied Sir Tristram resting beside a tomb; and, as was the custom of knights errant, he called upon him to joust. So the two ran together and each broke his spear. Then they sprang to the ground and fought with their swords, and each thought that never had he encountered so stout or so skilled a knight. So fiercely they fought that, perforce, at last they must rest. Then said Sir Launcelot: "Fair Knight, I pray you tell me your name, for never have I met so good a knight." "In truth," said Sir Tristram, "I am loth to tell my name." "I marvel at that," said Sir Launcelot; "for mine I will tell you freely. I am Launcelot du Lac." Then was Sir Tristram filled at once with joy and with sorrow; with joy that at last he had encountered the noblest knight of the Round Table, with sorrow that he had done him such hurt, and without more ado he revealed his name. Now Sir Launcelot, who ever delighted in the fame of another, had long desired to meet Sir Tristram de Liones, and rejoicing to have found him, he knelt right courteously and proffered him his sword, as if he would yield to him. But Tristram would not have it so, declaring that, rather, he should yield to Sir Launcelot. So they embraced right heartily, and when Sir Launcelot questioned him, Sir Tristram acknowledged that it was he who had come to King Arthur's aid. Together, then, they rode to Camelot, and there Sir Tristram was received with great honour by King Arthur, who made him Knight of the Round Table.
Presently, to Tristram at Camelot, there came word that King Mark had driven the Fair Isolt from court, and compelled her to have her dwelling in a hut set apart for lepers. Then Sir Tristram was wroth indeed, and mounting his horse, rode forth that same hour, and rested not till he had found the lepers' hut, whence he bore the Queen to the castle known as the Joyous Garde; and there he held her, in safety and honour, in spite of all that King Mark could do. And all men honoured Sir Tristram, and felt sorrow for the Fair Isolt; while as for King Mark, they scorned him even more than before.
But to Sir Tristram, it was grief to be at enmity with his uncle who had made him knight, and at last he craved King Arthur's aid to reconcile him to Mark. So then the King, who loved Sir Tristram, sent messengers to Cornwall to Mark, bidding him come forthwith to Camelot; and when the Cornish King was arrived, Arthur required him to set aside his enmity to Tristram, who had in all things been his loyal nephew and knight. And King Mark, his head full of hate, but fearful of offending his lord, King Arthur, made fair proffers of friendship, begging Sir Tristram to return to Cornwall with him, and promising to hold him in love and honour. So they were reconciled, and when King Mark returned to Cornwall, thither Sir Tristram escorted the Fair Isolt, and himself abode there, believing his uncle to mean truly and honourably by him.
But under a seeming fair exterior, King Mark hated Sir Tristram more than ever, and waited only to have him at an advantage. At length he contrived the opportunity he sought. For he hid him in the Queen's chamber at a time when he knew Sir Tristram would come there unarmed, to harp to the Fair Isolt the music that she loved. So as Sir Tristram, all unsuspecting, bent over his harp, Mark leaped from his lurking place and dealt him such a blow from behind that, on the instant, he fell dead at the feet of the Fair Isolt. So perished the good knight, Sir Tristram de Liones Nor did the Fair Isolt long survive him, for refusing all comfort, she pined away, and died within a few days, and was laid in a tomb beside that of her true knight. But the felon King paid the price of his treachery with his life; for Sir Launcelot himself avenged the death of his friend and the wrongs of the Fair Isolt.