When Did Transubstatiation become the Only Correct View in Roman Catholicism?

McCue, James F. “The Doctrine of Transubstantiation from Berengar through Trent: The Point at Issue.” Harvard Theological Review 61 (July 1960): 395-430.

This article demonstrates that for more than two centuries leading up to the Reformation, a large number of medieval theologians “thought that transubstantiation was not a necessary consequence of the doctrine of the physical presence.” Indeed, it was nearly a century after the Fourth Lateran Council that its proceedings were commonly understood as having made transubstantiation “a sine qua non of orthodoxy” (385). Before then, transubstantiation was simply the common favorite of three distinct possibilities, including the view that would come to be known as consubstantiation. Once we reach Thomas Aquinas, however, we encounter for the first time a vast difference. Not only does Thomas deem consubstantiation inappropriate and impossible, he also labels the view heretical. In this clear, well-written article, the author quotes the original Latin in the text of his paper and provides English translations in the footnotes. A superb and convincing piece of work.