Sir Lancelot du Lac (meaning Lancelot of the Lake), alternatively also written as Launcelot and other spellings, is one of the Knights of the Round Table in the Arthurian legend. He typically features as King Arthur’s greatest companion, the lord of Joyous Gard and the greatest swordsman and jouster of the age – until his adulterous affair with Queen Guinevere is discovered, causing a civil war exploited by Mordred which brings about the end of Arthur’s kingdom.
His first appearance as a main character is in Chrétien de Troyes’ Lancelot, the Knight of the Cart, written in the 12th century. Later, his exploits were expanded upon in the Prose Lancelot, which was further expanded upon for the Lancelot-Grail cycle. His and Lady Elaine’s son, Galahad, also becomes a famed knight.