Among the works which he translated into Syriac and of which his versions survive are treatises of Aristotle, Porphyry and Galen, 3 the Ars grammatica of Dionysius Thrax, the works of Dionysius the Areopagite, and possibly two or three treatises of Plutarch.4 His own original works are less important, but include a " treatise on logic, addressed to Theodore (of Merv), which is unfortunately imperfect, a tract on negation and affirmation; a treatise, likewise addressed to Theodore, On the Causes of the Universe, according to the Views of Aristotle, showing how it is a Circle; a tract On Genus, Species and Individuality; and a third tract addressed to Theodore, On the Action and Influence of the Moon, explanatory and illustrative of Galen's IIEpi rcptaiµwv r t µepwv, bk.
The last book (xvii.) treats of theology or (as we should now say) mythology, and winds up with an account of the Holy Scriptures and of the Fathers, from Ignatius and Dionysius the Areopagite to Jerome and Gregory the Great, and even of later writers from 'Isidore and Bede, through Alcuin, Lanfranc and Anselm, down to Bernard of Clairvaux and the brethren of St Victor.
Darboy was the author of a number of works, of which the most important are a Vie de St Thomas Becket (1859), a translation of the works of St Denis the Areopagite, and a translation of the Imitation of Christ.
Religious thought about the angels during the middle ages was much influenced by the theory of the angelic hierarchy set forth in the De Hierarchia Celesti, written in the 5th century in the name of Dionysius the Areopagite and passing for his.
A beginning had been made, in the 5th century, by the neoplatonic Christian who addressed his contemporaries under the mask of Dionysius the Areopagite.