King Horn is a Middle English chivalric romance dating back to the middle of the thirteenth century. It survives in three manuscripts: London, British Library, MS. Harley 2253; Oxford, Bodleian Library, MS. Laud. Misc 108; and Cambridge, Cambridge University Library, MS. Gg. iv. 27. 2. It is thought to be based on the Anglo-Norman Romance of Horn (1170). The story was retold in later romances and ballads, and is considered part of the Matter of England. The poem is currently believed to be the oldest extant romance in Middle English. Source: Wikipedia (en)