Summe Sacerdos et vere Pontifex (Supreme Priest and True Pontiff)
Summe sacerdos et vere Pontifex
A private preparatory prayer for Holy Communion, composed by John of Fécamp and circulated for centuries as a prayer of St. Ambrose in the pre-Mass prayers of the Roman Rite. Beginning 'Summe sacerdos et vere Pontifex, qui te obtulisti deo patri hostiam puram...,' it meditates on the priest's unworthiness before the Eucharist and implores Christ's mercy through His Precious Blood. Its inclusion in pre-Mass devotions anchored it to the court chapel practice of every Norman, Capetian, and imperial chaplain who followed the Roman rite. The misattribution to Ambrose guaranteed it universal prestige. André Wilmart's twentieth-century scholarship restored authorship to John.