A hero of many battles, quests and tournaments, and famed as a nearly unrivalled swordsman and jouster, Lancelot soon becomes the lord of the castle Joyous Gard and personal champion of Queen Guinevere, to whom he is devoted absolutely.

After Lady Elaine seduces him using magic, their son Galahad, devoid of his father's flaws of character, becomes the perfect knight that succeeds in completing the greatest of all quests, achieving the Holy Grail when Lancelot himself fails due to his sins.

Eventually, when Lancelot's adulterous affair with Guinevere is publicly discovered, it develops into a bloody civil war that, once exploited by Mordred, brings an end to Arthur's kingdom.

However, another early Lancelot poem, Lanzelet, a German translation of an unknown French book, did not feature such a motif and the connections between the both texts and their possible common source are uncertain.

Later, his character and story was expanded upon Chrétien's tale in the other works of Arthurian romance, especially through the vast Lancelot-Grail prose cycle that presented the now-familiar version of his legend following its abridged retelling in Le Morte d'Arthur.

[4] Proponents of the Scythian origins of Arthurian legend have speculated that an early form might have been Alanus-à-Lot, that is "Alan of the river Lot",[5] and those looking for clues in classical antiquity see elements of Lancelot in the Ancient Greek mythical figures of Askalos and Mopsus (Moxus).

The theft of an infant by a water fairy, the appearance of the hero at a tournament on three consecutive days in three different disguises, and the rescue of a queen or princess from an Otherworld prison are all features of a well-known and widespread tale, variants of which are found in numerous examples collected by Theodore Hersart de la Villemarqué in his Barzaz Breiz, by Emmanuel Cosquin in his Contes Lorrains, and by John Francis Campbell in his Tales of the West Highlands.

[14] It is also possibly derived from the Old French word L'Ancelot, meaning "Servant" (the hypothesis first put forward by de la Villemarqué in 1842); Lancelot's name is actually written this way in several manuscripts.

Margaret was the half-sister of Chrétien's patroness, Marie de Champagne, and the creation of Lancelot would thus meant to honor the Hungarian king around the time of his marriage to a member of the French royal house.

[16] Lancelot's name appears third on a list of knights at King Arthur's court in the earliest known work featuring him as a character: Chrétien de Troyes' Old French poem Erec and Enide (1170).

In the words of Matilda Bruckner, "what existed before Chrétien remains uncertain, but there is no doubt that his version became the starting point for all subsequent tales of Lancelot as the knight whose extraordinary prowess is inextricably linked to his love for Arthur's Queen.

"[19] Lancelot's passion for Arthur's wife Guinevere is entirely absent from another early work, Lanzelet, a Middle High German epic poem by Ulrich von Zatzikhoven dating from the very end of the 12th century (no earlier than 1194).

[26] His adventure among the tombs is described in terms that suggest Christ's harrowing of Hell and resurrection; he effortlessly lifts the lid off the sarcophagus, which bears an inscription foretelling his freeing of the captives.

[28] German romance Diu Crône gives Lancelot aspects of solar deity type hero, making his strength peak during high noon, a characteristic usually associated with Gawain.

[31] Near the end of the 15th century, Malory's Le Morte d'Arthur followed the Lancelot-Grail in presenting Lancelot as the best knight, a departure from the preceding English tradition in which Gawain had been the most prominent.

In an alternate version as retold in the Italian La Tavola Ritonda, Lancelot is born when the late Ban's wife Gostanza delivers him two months early and soon after also dies.

Diverging on Lancelot's personality, the narration then adds the first mention of his mental instability (which was not explicitly stated in Chrétien's version, although Chrétien's Lancelot is notably relentless on his quest to rescue Guinevere, leaping into danger without thinking and ignoring wounds and pain), in particular proneness to berserk-like combat frenzy: His eyes were bright and smiling and full of delight as long as he was in a good mood, but when he was angry, they looked just like glowing coals and it seemed that drops of red blood stood out from his cheekbones.

The Lady equips him a powerful magic ring able to dispel any enchantment (as his anonymous fairy foster mother also does in Chrétien's version; later parts of the Vulgate Lancelot instead retcon this as given to him by Guinevere[38]).

Almost immediately upon his arrival, Lancelot and the young Queen Guinevere fall in love through a strange magical connection between them, and one of his adventures in the prose cycles involves saving her from abduction by Arthur's enemy Maleagant.

Lancelot's initial knight-errant style adventures from the Vulgate Cycle did make their way into Malory's compilation range from proving victorious in a tournament fighting on behalf of King Bagdemagus, through slaying the mighty villain Turquine who had been holding several of Arthur's knights prisoner, to overcoming a damsel's betrayal and defending himself unarmed against her husband Phelot.

The motif of his recurring fits of madness (especially "in presence of sexually charged women"[46]) and suicidal tendencies (usually relating to the false or real news of the death of either Gawain or Galehaut) return often throughout the Vulgate and sometimes in other versions as well.

Galehaut is poised to become the victor and conquer Arthur's kingdom, but he is taken by Lancelot's amazing battlefield performance and offers him a boon in return for the privilege of one night's company in the bivouac.

Similarly, Elaine of Astolat (Vulgate's Demoiselle d'Escalot, in modern times better known as "the Lady of Shalott"), also dies of heartbreak due to her unrequited love of Lancelot.

Lancelot, shown the Holy Grail through a veil, is cured of his madness, and then chooses to live with her on a remote isle, where he is known incognito as the Wicked Knight (Chevalier Malfait, the form also used by Malory).

The quest is initiated by Lancelot's estranged son, the young teenage Galahad, having prevailed over his father in a duel during his own dramatic arrival at Camelot, among other acts that proved him as the most perfect knight.

Following further adventures, during which he experiences defeat and humiliation, Lancelot himself is again allowed only a glimpse of the Grail because he is an adulterer and was distracted from faith in God by earthly honours that came through his knightly prowess.

Lancelot also saves the Queen from an accusation of murder by poison when he fights as her champion against Mador de la Porte upon his timely return in another episode included in Malory's version.

Upon receiving a desperate letter from the dying Gawain offering him forgiveness and asking for his help in the fight against Mordred, Lancelot hurries to return to Britain with his army, only to hear the news of Arthur's death at Salisbury Plain (romance version of the Battle of Camlann).

In the original from the variants of Mort Artu, after mourning his king, Lancelot abandons society, with exception of his later participation in a victorious war against the young sons of Mordred and their Briton supporters and Saxon allies that provides him with partial atonement for his earlier role in the story.

The distraught Lancelot's health then begins to fail (Le Morte d'Arthur states that even before this time, he had lost a cubit of height due to his fastings and prayers) and he dies six weeks after the death of the queen.