Didn't you Catholics invent transubstantiation in the 13th century?
This is a false charge levied against the Church that finds its origin in a book by Loraine Boettner called Roman Catholicism. This book is often referred to as the "anti-Catholic bible."
Boettner charges that transubstantiation was an invention by the pope in the year 1215. "The implication is that transubstantiation was not believed until 1215—that it was, indeed, an 'invention'. The facts are otherwise. Transubstantiation is just the technical term used to describe what happens when the bread and wine used at Mass are turned into the actual Body and Blood of Christ. The belief that this occurs has been held from the earliest times. It stems from the sixth chapter of John's Gospel, the eleventh chapter of First Corinthians, and the several accounts of the Last Supper. As centuries passed, theologians exercised their reason on the belief to understand more completely how such a thing could happen and what its happening would imply. Because some of them, in trying to explain the Real Presence, developed unsound theories, it became evident that more precise terminology was needed to ensure the integrity of the belief. The word transubstantiation was finally chosen because it eliminated certain unorthodox interpretations of the doctrine, and the term was formally imposed at the Fourth Lateran Council in 1215. So the use of the technical term was new, but not the doctrine."*
*Karl Keating, Catholicism and Fundamentalism, 42-43.