Valentine and Orson is a romance which has been attached to the Carolingian cycle.
It is the story of twin brothers, abandoned in the woods in infancy. Valentine is brought up as a knight at the court of Pippin, while Orson grows up in a bear's den to be a wild man of the woods, until he is overcome and tamed by Valentine, whose servant and comrade he becomes. The two eventually rescue their mother Bellisant, sister of Pippin and wife of the emperor of Greece, by whom she had been unjustly repudiated, from the power of a giant named Ferragus.
There are versions of an older version of this tale, which appears to rest on a lost French original, in French, English, German, Icelandic, Dutch and Italian. In the older versions Orson is described as "sans nom" i.e. the "nameless" one. The kernel of the story lies in Orson's upbringing and wildness, and is evidently a folk-tale the connection of which with the Carolingian cycle is purely artificial. The story of the wife unjustly accused with which it is bound up is sufficiently common, and was told of the wives both of Pippin and Charlemagne.
The oldest French version was a 13th [?] century chanson the geste *Valentin et Sansnom that did not survive but was translated/adapted in medieval Dutch as Valentijn en(de) Nameloos (14th century fragments only). A French 'remaniement' in prose was printed at Lyon in 1489 by Jacques Maillet and often subsequently. The Historye of the two Valyannte Brethren: Valentyne and Orson by Henry Watson, printed by William Copland about 1550, is the earliest known of a long series of English versions - some of which included illustrations. One such illustrated variant of the tale was prepared by S R Littlwood and accompanied by the illustrations of Florence Anderson when published in 1919.
It is known that Richard Hathwaye and Anthony Munday produced a version of it in 1598.
Nancy Ekholm Burkert wrote and illutrated a version of the story in 1989, in which the story is told through the lens of a traveling group of players (including two brothers) who bring the story to a village in Flanders in the Middle Ages.
This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.