[3] English chronicler Matthew Paris mentions him as an astrologer and an authority for the life of Stephen Langton, Archbishop of Canterbury.
[4] Paris also describes him as the author of the epitaph on William Marshal, 1st Earl of Pembroke, who died in 1219.
[6] He wrote Ars versificaria (The Art of Versifying) c. 1208–1216 (possibly, in 1215–1216), using both classical and medieval sources.
[9] 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.
[12][13] As well as in Ars versificaria, his poems also survive in an early thirteenth-century collection of poetry known as Hunterian Anthology.