The king went to Sir Tristram and found him fully armed, as if ready to fight for his life, for he knew that now the truth had been discovered.
'Nay, Sir Tramor,' said the king gravely, 'it will not avail thee to fight me. But this will I do for the love and honour I bear thee. Inasmuch as ye are within my court it would be no worship for me to have thee taken and slain, and therefore will I let thee freely depart if thou wilt tell me this: Who is thy father and what is thy name? And didst thou truly and rightly slay Sir Marhaus?'
'Tristram is my name,' replied the young knight, 'and I am son of King Talloch of Lyones. For the truage of Cornwall I fought for the sake of my uncle King Mark, and the battle with Sir Marhaus was the first I had, for I was made knight for that alone. Sir Marhaus went from me alive into his ship, though he left his sword and shield behind him.'
'I may not say that ye have done aught but what a good knight should do,' replied the king, 'but I may not maintain you in this country unless I would displease my wife and her kin.'
'Sir,' said Sir Tristram, 'I thank you for your goodness and for the kind cheer which I have had here of yourself and your queen and La Belle Isoude. I will depart straightway when I have bidden your daughter farewell, for I owe my life to her gentle hands; and I promise this, that I will be your daughter's servant and knight in right or wrong, to shield her and fight for her, and do all that a knight may do in her behalf, as long as I live.'
Then took he his leave of La Belle Isoude, and he told her all how he had come to that land. He thanked her heartily for all her gentleness to him and for her healing of his wound. At first she stood silent, changing red and white of face, and with downcast eyes, her fingers straining about each other. When he swore that he would be her knight, to fight for her whenever she should send for him, and bade her good-bye, she took the hand which he held forth, but would not look at him.
Tristram wondered why her fair hand was so cold. 'Good-bye and God be with ye always,' La Belle Isoude replied in a faint voice, and then turned and went from him. Tristram thought she was angered with him for the slaying of her uncle.
So in a little while he rode forth with Governale down to the seashore and looked back not once. There he entered by a ship, and with good wind he arrived at Tintagel in Cornwall, and King Mark and all his barons were glad that Tristram was whole again.
Then Sir Tristram went to his father King Talloch, and there was made great cheer for him, and wide lands were given him. Nevertheless, he could not rest long in one place, but went into Logres and Alban and Wales, seeking adventures, and his fame for prowess was almost as great as the fame of Sir Lancelot. Whereever he went he took his harp, and in hall and bower his favourite songs were those that praised the beauty of La Belle Isoude, her gentle ways and her soft white hands.
After a year and a day he returned to the court of King Mark and lived there, and all the knights and ladies admired him, and the praise of his courtesy was in the mouths of all, noble and simple, high and low. Then King Mark his uncle began to hate him for the love that all bore him, and since he had never married and had no son to whom his kingdom should go after his death, he saw that Sir Tristram would have it, for he was his next kin, and then, with Lyones and Tintagel, the fame and power of Tristram would increase abundantly.