Sir Galahad (/ˈɡæləhæd/; sometime referred to as Galeas /ɡəˈliːəs/ or Galath /ˈɡæləθ/), in Arthurian legend, is a knight of King Arthur's Round Table and one of the three achievers of the Holy Grail. He is the illegitimate son of Sir Lancelot and Elaine of Corbenic, and is renowned for his gallantry and purity. Emerging quite late in the medieval Arthurian tradition, Sir Galahad first appears in the 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.