How Sir Percivale departed secretly from his brother, and how he loosed a knight bound with a chain; and of other things. Chap. xii. How Sir Percivale met with Sir Ector, and how they fought long, and each had almost slain other. Chap. xiii. How by miracle they were both made whole by the coming of the holy vessel of Sangreal. Chap. xiv. Here follow the Chapters of the Twelfth Book. How Sir Launcelot in his madness took a sword and fought with a knight, and after lept into a bed. Chap. i. How Sir Launcelot was carried in an horse-litter, and how Sir Launcelot rescued Sir Bliaunt his host. Chap. ii. How Sir Launcelot fought against a boar and slew him, and how he was hurt and brought to an hermitage. Chap. iii. How Sir Launcelot was known by dame Elaine, and was borne into a chamber, and after healed by the Sangreal. Chap. iv. How Sir Launcelot, after that he was whole and had his mind, he was ashamed, and how that Elaine desired a castle for him. Chap. v. How Sir Launcelot came into the Joyous Isle, and there he named himself le Chevalier Mal Fet. Chap. vi. Of a great tourneying in the Joyous Isle, and how Sir Percivale and Sir Ector came thither and Sir Percivale fought with him. Chap. vii. How each of them knew other, and of their courtesy; and how his brother Ector came unto him, and of their joy. Chap. viii. How Sir Bors and Sir Lionel came to king Brandegore, and how Sir Bors took his son Heline le Blank, and of Sir Launcelot. Chap. ix. How Sir Launcelot, with Sir Percivale and Sir Ector, came to the court, and of the great joy of him. Chap. x. How La Beale Isoud counselled Sir Tristram to go unto the court to the great feast of Pentecost. Chap. xi. How Sir Tristram departed unarmed and met with Sir Palamides, and how they smote each other, and how Palamides forbare him. Chap. xii. How Sir Tristram gat him harness of a knight which was hurt, and how he overthrew Sir Palamides. Chap. xiii. How Sir Tristram and Sir Palamides fought long together, and after accorded; and how Sir Tristram made him to be christened. Chap. xiv. Here follow the Chapters of the Thirteenth Book. How at the Vigil of the feast of Pentecost entered into the hall before king Arthur a damsel, and desired Sir Launcelot for to come and dub a knight, and how he went with her. Chap. i. How the letters were found written in the Siege Perilous, and of the marvellous adventure of the sword in a stone. Chap. ii. How Sir Gawaine assayed to draw out the sword, and how an old man brought in Galahad. Chap. iii. How the old man brought Galahad to the Siege Perilous, and set him therein, and how all the knights marvelled. Chap. iv. How king Arthur shewed the stone hoving on the water to Galahad, and how he drew out the sword. Chap. v. How king Arthur had all the knights together for to just in the meadow beside Winchester or they departed. Chap. vi.