So the Lady Lyonesse did as Sir Gareth had counselled her, and answered King Arthur that where Sir Gareth was she could not tell, but that if the King would call a tourney he might be sure that Sir Gareth would come to it. “It is well thought of,” said Arthur, and the Lady Lyonesse departed unto Castle Perilous, and summoned all her Knights around her, and told them what she had done, and how they were to make ready to fight in the tournament. She began at once to set her castle in order, and to think what she should do with the great array of Knights that would ride hither from the furthest parts—from Scotland and Wales and Cornwall—and to lodge fitly the Kings, Dukes, Earls, and Barons that should come with Arthur. Queen Guenevere also she awaited, and the Queen of Orkney, Sir Gareth’s mother. But Sir Gareth entreated the Lady Lyonesse and those Knights that were in the castle with him not to let his name be known, and this they agreed to.
“Sir Gareth,” said dame Lyonesse, “I will lend you a ring, which I beseech you for the love you bear me to give me back when the tournament is done, for without it I have but little beauty. This ring is like no other ring, it will turn green red, and blue white, and the bearer shall lose no blood, however sore he may be wounded.”
“Truly, my own lady,” answered Sir Gareth, “this ring will serve me well, and by its help I shall not fear that any man shall know me.” And Sir Gringamore, brother to the Lady Lyonesse, gave him a bay horse, and strong armour, and a sharp sword that had once belonged to his father. On the morning of the fifteenth of August, when the Feast of the Assumption was kept, the King commanded his heralds to blow loudly their trumpets, so that every Knight might know that he must enter the lists. It was a noble sight to see them flocking clad in shining armour, each man with his device upon his shield. And the heralds marked who bare them best, and who were overthrown. All marvelled as to who the Knight could be whose armour sometimes seemed green, and sometimes white, but no man knew it was Sir Gareth. And whosoever Sir Gareth tilted with was straightway overthrown. “Of a truth,” cried King Arthur, “that Knight with the many colours is a good Knight,” and he called Sir Lancelot and bade him to challenge that Knight to combat. But Sir Lancelot said that though the Knight had come off victor in every fight, yet his limbs must be weary, for he had fought as a man fights under the eyes of his lady, “and for this day,” said Sir Lancelot, “he shall have the honour. Though it lay in my power to put it from him, I would not.”