Lancelot

One of the greatest knights in Arthurian legend, the lover of Guinevere and the father of Galahad. He first appeared in a 12th-century romance by Chrétien de Troyes, and he is a major character in Sir Thomas Malory's Morte Darthur. His full name, Sir Lancelot du Lac, refers to his upbringing by the Lady of the Lake, the enchantress who carried him off in infancy and trained him to be a model of chivalry before sending him to Arthur's court. There he became the favorite of King Arthur and the lover of Queen Guinevere. His adultery with Guinevere caused him to fail in the quest for the grail and set in motion the events that led to the destruction of Camelot. He was displaced as the model knight by Galahad, his son by the grailkeeper's daughter Elaine.