Yvain-dragon - Public domain dedication image

Français : Yvain combattant un dragon avec l'aide de son lion
English: "Yvain and the dragon". The uploader could not be bothered to identifiy the source.
It is apparently from a 15th-century French manuscript, possibly from MSS BNF fr. 112, 113-116, a set of manuscripts of Arthurian romances made for Jacques d'Armagnac (1433–1477).[1]

(lit. S. Blackman, 'A Pictorial Synopsis of Arthurian Episodes for Jacques d'Armagnac, Duke of Nemours,' in Keith Busby, ed., Word and Image in Arthurian Romance New York: Garland, 1996, 3-57.)