In Arthurian legend , the pure knight who achieved a vision of God through the Holy Grail.
The illegitimate son of Lancelot and the princess Elaine, he alone was worthy to sit in the Siege Perilous at the Round Table, reserved for the one destined to succeed in the quest for the Sir Thomas Malory 's Morte Darthur . See also {{link=Perceval">Perceval .