Percival (Sir), the third son of sir Pellinore king of Wales.  His brothers were sir Aglavale and sir Lamorake Dornar, usually called sir Lamorake de Galis (Wales).  Sir Tor was his half-brother.  Sir Percival caught a sight of the holy graal after his combat with sir Ector de Maris (brother of sir Launcelot), and both were miraculously healed by it.  Crétien de Troyes wrote the Roman de Perceval (before 1200), and Menessier produced the same story in a metrical form.  (See Parzival)
    Sir Percivale had a glimmering of the Sancgreall and of the maiden that bare it, for he was perfect and clean.  And forthwith they were both as whole of limb and hide as ever they were in their life days.  "Oh mercy!" said sir Percival, "what may this mean?"... "I wot well," said sir Ector... "it is the holy vessel, wherein is a part of the holy blood of our blessed Saviour; but it may not be seen but by a perfect man."—Pt. iii. 14.
    Sir Percival was with sir Bors and sir Galahad when the visible Saviour went into the consecrated wafer which was given to them by the bishop.  This is called the achievement of the quest of the holy graal (pt. iii. 101, 102).—Sir T. Malory, History of Prince Arthur (1470). (The Reader's Handbook of Famous Names in Fiction, &c., Brewer, v.2, 1899)