Libeaus Desconus is a 14th-century Middle English version of the popular "Fair Unknown" story. Its author is thought to be Thomas Chestre. The story matter displays strong parallels to that of Renaut de Beaujeu's Le Bel Inconnu; both versions describe the adventures of Gingalain, the son of King Arthur's knight Gawain and a fay who raises him ignorant of his parentage and his name. As a young man, he visits Arthur's court to be knighted, and receives his nickname; in this case Sir Libeaus Desconus, before setting forth on a series of adventures which consolidate his new position in society. He eventually discovers who is his father, and marries a powerful lady.
Other versions of the story include the Middle High German romance Wigalois (1204–1209) by Wirnt von Gravenberc. The "Fair Unknown" story has parallels in the tale of La Cote Male Taile, Chrétien de Troyes' Conte du Graal, Sir Thomas Malory's Tale of Sir Gareth from Le Morte d'Arthur, and the 14th century Italian epic Carduino.
Versions of Libeaus Desconus can be found in the following manuscripts:
Judged by the number of surviving manuscripts, the Libeaus Desconus was the most popular of the Arthurian romances in Middle English.
(This summary is based on the Lambeth Palace text.)
Gyngelayne is raised in the forest by his mother, who tries to keep him away from arms since she fears that her 'wild' son might otherwise come to harm. Gyngelayne is never told his real name by his mother. Instead, she calls him ‘Bewfiȝ’, since he is 'gentle of body' and has an attractive face. One day, Gyngelayne finds a dead knight in the forest. He dons the man’s armour and goes to Glastonbury, where King Arthur is holding court. There he asks Arthur to dub him a knight although his upbringing is uncourtly. Arthur is so pleased by young Gyngelayne's sight that he gives him a name – Libeaus Desconus, ‘The Fair Unknown’ – and knights him that same day. Libeaus at once asks King Arthur if he might be offered the first challenge for which the king is required to provide a champion.