Aelius Donatus
Among his sources are ancient authors Horace ("Ars Poetica"), Cicero ("De Inventione"), Aelius Donatus ("Barbarismus") and Juvenal, as well as Bernard Silvestris's "Cosmographia", Alain of Lille's "Anticlaudianus", John of Hauville's "Architrenius", and Geoffrey of Vinsauf's "Poetria nova". He also quotes the Book of Psalms and some of his own short poems.