Lynet is furious when she sees a kitchen boy assigned to her, but she has no choice. Beaumains' dwarf produces a splendidly dressed horse and fine armor, to all the court's amazement, and Beaumains rides off without spear or shield. Kay follows to mock him and Beaumains takes Kay's spear and shield. Beamains tells Launcelot, who has seen all this, that he is Gawain's brother Gareth.
He is knighted and, bearing Kay's shield, begins a series of adventures each more difficult than the last, throughout which Lynet belittles and scorns him. He beats six thieves, two knights at a bridge, the Black Knight, the Green Knight, Sir Persaunt of Inde, and at last the Red Knight of the Red Lands. Lynet finally comes to approve him.
Now Lyonesse requires that he serve her faithfully for a year in order to win her love. He does so, and in further encounters proves his might, pluck, and chastity. He and Lyonesse plan a tournament at which Gareth is to win her as his lady. After the tournament, but before Gareth rejoins Lyonesse, he fights the Brown Knight without Pity (Bereuse Saunz PitŽ) and — unknowingly — his own brother Gawain. Lyonesse stops the final battle by making the two brothers known to each other; then Gareth and Lyonesse are married at Arthur's court.
