Forthwith there came from Ireland Sir Marhaus, brother of the Queen of Ireland.  Now Sir Marhaus was Knight of the Round Table and in his time there were few of greater renown.  He anchored his ships under the Castle of Tintagil, and sent messengers daily to King Mark, bidding him pay the tribute or find one to fight in his cause.

Then was King Mark sore perplexed, for not one of his knights dared encounter Sir Marhaus.  Criers were sent through all the land, proclaiming that, to any knight that would take the combat upon him, King Mark would give such gifts as should enrich him for life.  In time, word of all that had happened came to Liones, and immediately Tristram sought his father, desiring his permission to go to the court of his uncle, King Mark, to take the battle upon him.  Thus it came to pass that, with his father’s good leave, Tristram presented himself before King Mark, asking to be made knight that he might do battle for the liberties of Cornwall.  Then when Mark knew that it was his sister’s son, he rejoiced greatly, and having made Tristram knight, he sent word to Sir Marhaus that there was found to meet him a champion of better birth than Sir Marhaus’ self.

So it was arranged that the combat should take place on a little island hard by, where Sir Marhaus had anchored his ships.  Sir Tristram, with his horse and arms, was placed on board a ship, and when the island was gained, he leaped on shore, bidding his squire put off again and only return when he was slain or victorious.

Now, when Sir Marhaus saw that Tristram was but a youth, he cried aloud to him:  “Be advised, young Sir, and go back to your ship.  What can ye hope to do against me, a proven knight of Arthur’s Table?” Then Tristram made answer:  “Sir and most famous champion, I have been made knight to do battle with you, and I promise myself to win honour thereby, I who have never before encountered a proven knight.”  “If ye can endure three strokes of my sword, it shall be honour enough,” said Sir Marhaus.  Then they rushed upon each other, and at the first encounter each unhorsed the other, and Sir Marhaus’ spear pierced Sir Tristram’s side and made a grievous wound.  Drawing their swords, they lashed at each other, and the blows fell thick as hail till the whole island re-echoed with the din of onslaught.  So they fought half a day, and ever it seemed that Sir Tristram grew fresher and nimbler while Sir Marhaus became sore wearied.  And at the last, Sir Tristram aimed a great blow at the head of his enemy, and the sword crashed through the helmet and bit into the skull so that a great piece was broken away from the edge of Tristram’s sword.  Then Sir Marhaus flung away sword and shield, and when he might regain his feet, fled shrieking to his ships.  “Do ye flee?” cried Tristram.  “I am but newly made knight; but rather than flee, I would be hewn piecemeal.”