So month after month Sir Tristram lingered on in Ireland, and did many a noble deed during that time, and there he might have gone on living to the end of the chapter, if it had not been for a sore mischance which befell thus.

One day, while Sir Tristram was absent, the queen and the lady Iseult were wandering up and down his room, when the queen suddenly espied Sir Tristram's sword lying on a couch, and seeing it to be of fine workmanship and delicately wrought, she lifted it the better to examine it, and she and Iseult stood admiring it together. Then presently the queen drew the sword slowly from out its scabbard, and there, within an inch and a half of the point, she espied the broken edge of the blade.

Thrusting the weapon into Iseult's hands she ran to her chamber, where she had, safely locked away, the piece of steel which had been taken from her brother's skull; and bringing it back fitted it to the broken blade exactly.

At that her anger knew no bounds, nor her mortification that they should have treated so well, and grown to love, the slayer of her brother. Sir Tristram happening to return at that moment, her anger so overmastered her that, seizing the sword, she rushed on him and would have slain him there and then, had not Gouvernail caught her and wrested the weapon from her.

Being frustrated she ran in a frenzy of hate to her husband. "My lord," she cried, "we have here, in our very home, the destroyer and slayer of my brother, your most noble and trusty knight."

"Who is he?" cried King Anguish, springing to his feet, "and where?"

"Sir, it is this same knight whom your daughter has healed, and whom we have loved and treated well. I beseech you have no mercy on him, for he deserves none."

"Alas, alas," cried the king, "I am right sorry, for he is as noble a knight as ever I saw. Do him no violence. Leave him to me, and I will deal with him according to my best judgment."

So the king, who loved Sir Tristram, and could not bring himself to have him slain, went to Tristram's chamber, and there he saw him dressed, and ready to mount his horse. Then and there the king told him all that he had learnt, and said, "I love you too well to do you harm, therefore I give you leave to quit this court on one condition, that you tell me your real name, and if you really slew my brother-in-law, Sir Marhaus."

So Tristram told him all his story, and then took leave of the king and all the court; and great was the grief at his departure, but by far the saddest leave-taking was that between him and La Belle Iseult, for they loved each other very dearly. And when they parted Sir Tristram swore to be ever her true and faithful knight, and she, that for seven years she would marry no one else, unless by his consent or desire. Then each gave the other a ring, and with a last long kiss they parted.