Charters date Ardengus' teaching career in Paris to the years 1227-1229. He was elected bishop of Florence in 1231 where he introduced reforms and excommunicated the Patarini[?]. He was a canon of Pavia.
- Abbrevatio summae magistri Guillelmi Autissiodorensis Unedited, for MSS see Landgraf, Introduction, p. 174
- Artur Michael Landgraf, Introduction à l'histoire de la littérature théologique de la scolastique naissante Edited by Albert-M. Landry, translated by Louis-B. Geyer. Université de Montréal, Publications de l'Institut d'Études médiévales, vol. 22. Montreal and Paris, 1973.
- U. Betti, "Il Maestro Ardengo, vescovo di Firenze," Divinitas 9 (1965): 161-70
- F. Stegmüller, "Ardingus," LThK 1 (1957): 829
- Glorieux, Répertoire, 1: 284-5, n. 120
- Johannes Baptist Schneyer, Repertorium der lateinischen Sermones des Mittelalters. 11 volumes. (Beiträge zur Geschichte der Philosophie und Theologie des Mittelalters, 43/1-11.) Aschendorff: Münster, 1969-1990
Information derived from Gary Macy A Guide to Thirteenth Century Theologians http://www.sandiego.edu/~macy