The Canon Romanus is an anaphora (eucharistic prayer), intended to transform the bread and wine offered at a Mass into the body and blood of Jesus (Christ, Jesus, 01: Survey). Although it may have been composed as a single prayer, in written form it would normally be presented as a series of individual formulas. The boundaries of what marked the beginning and end of the Canon Romanus in the context of the Mass are unclearly demarcated in our earliest manuscripts, but it was chanted after the offerto…