Galahad, sometimes referred to as Galeas or Galath, among other versions of his name (originally Galaad, Galaaz, or Galaaus), is a knight of King Arthur’s Round Table and one of the three achievers of the Holy Grail in Arthurian legend. He is the illegitimate son of Sir Lancelot du Lac and Lady Elaine of Corbenic and is renowned for his gallantry and purity as the most perfect of all knights. Emerging quite late in the medieval Arthurian tradition, Sir Galahad first appears in the early 13th century Lancelot–Grail cycle, and his story is taken up in later works, such as the Post-Vulgate Cycle, and Sir Thomas Malory’s Le Morte d’Arthur. In Arthurian literature, he replaced Percival, introduced in the late 12th century, as the hero in the quest for the Holy Grail.