Prophetia Merlini (John of Cornwall)
Latin poem (139 hexametric lines) on Merlin and his prophecies, written by John of Cornwall in the middle of the 12th century, or somewhat later, in response to Geoffrey of Monmouth’s account of the same subject. In the introduction, John dedicates his work to his patron, Robert Warelwast (d. 1155), bishop of Exeter, or his succcessor Robert of Chichester (d. 1160?), and puts forward the claim that he is drawing on an independent Cornish source for his text. The text is accompanied by a prose commentary, notably including glosses in a variety of Brittonic, possibly Cornish, the origin and nature of which has been subject to some debate.