Galahad (/ˈɡæləhæd/), sometimes referred to as Galeas (/ɡəˈliːəs/) or Galath (/ˈɡæləθ/), 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 the 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 prose cycle. There and in subsequent works, such as the Post-Vulgate Cycle and Le Morte d'Arthur, he has replaced Perceval, introduced in the late 12th century, as the main Grail hero.