Galahad, Sir, in British medieval legends, one of King Arthur's knights. He was the son of Sir Lancelot, one of the bravest of Arthur's knights, and of Elaine of Astolat, daughter of King Pelses. Noble and pure, he led other knights in a search for the Holy Grail. Galahad's story is told in Le Morte d'Arthur (1470), by Sir Thomas Malory, and in a poem by Alfred Lord Tennyson.
See also: Arthur, King.