Peredur (Sir), son of Evrawc, called "sir Peredur of the Long Spear," one of the knights of the Round Table.  He was for many years called "The Dumb Youth," from a vow he made to speak to no Christian till Angharad of the Golden Hand loved him better than she loved any other man.  His great achievements were:  (1) the conquest of the Black Oppressor, "who oppressed every one and did justice to no one; (2) killing the Addanc of the Lake, a monster that devoured daily some of the sons of the king of Tortures: this exploit he was enabled to achieve by means of a stone which kept him invisible; (3) slaying the three hundred heroes privileged to sit round the countess of the Achievements: on the death of these men, the seat next the countess was freely given to him; (4) the achievement of the Mount of Mourning, where was a serpent with a stone in its tail which would give inexhaustible wealth to its possessor: sir Peredur killed the serpent, but gave the stone to his companion, earl Etlym of the east country.  These exploits over, sir Peredur lived fourteen years with the empress Cristinobyl the Great.
    Sir Peredur is the Welsh name for sir Perceval of Wales.—The Mabinogion (from the Red Book of Hergest, twelfth century.) (The Reader's Handbook of Famous Names in Fiction, &c., Brewer, v.2, 1899)