What is Transubstantiation?
The Roman Catholic Church teaches that at the Breaking of Bread, which they call the Mass or the Communion Service, the bread and the wine actually changes into the body and blood of Christ at the request of the priest. This is known as Transubstantiation. The Catholics claim that this doctrine is to be found in the writings of some of the early church fathers, but scholars generally agree that it was first expressed with any clarity by a monk named Paschasius Radbertus in the 9th century CE. It was incorporated into the Creed of the Fourth Lateran Council in 1215 CE. and defined at the Council of Trent as follows: By the consecration of the bread and wine, a conversion (or change) is made of the whole substance of the bread into the substance of the body of Christ Our Lord, and of the whole substance of the wine into the substance of His blood; which conversion is, by the holy Catholic Church, suitably and properly called Transubstantiation. If anyone saith, that, in the sacred and ho