5The Sentences of Peter Lombard was the standard theological text from the twelfth through the fifteenth century (and even well beyond that in some places); producing a commentary on it was the equivalent of a doctoral dissertation, since it qualified the commentator to teach at the university level. Accordingly, all of the famous medieval scholastics, from Alexander of Hales to John Duns Scotus to William of Ockham, produced their own commentaries on the Sentences. Appearing for the first time in English, this volume features a bilingual Latin-English edition of Aquinas' first major work, the Commentary on the Sentences of Peter Lombard.