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Rethinking the Schism of 1054: Authority, Heresy, and the Latin Rite

In the year 1053, at the request of the Byzantine patriarch, Michael Kerullarios (1043–58), Archbishop Leo of Ochrid denounced the “priesthood of the Franks and the reverend pope” for observing Jewish rites through their celebration of the Eucharist with azymes, the same kind of unleavened bread used for Passover. Leo made these accusations in a letter addressed to John, archbishop of Trani in southern Italy, a region of coexisting Latin and Greek religious traditions that had been destabilized by the recent invasion of the Normans. The epistle was subsequently passed along to papal confidante Humbert of Silva Candida, who translated it into Latin and presented it to Pope Leo IX (1048–54). Around that same time, the two churchmen also heard news that the Greek patriarch had anathematized all those observing the Latin rite in Constantinople. A flurry of inconclusive correspondence ensued between the pope, the patriarch, and the Byzantine ruler, Constantine IX Monomachos (1042–55). In response to this persistent crisis, Pope Leo dispatched a legation to Constantinople that included Humbert, Frederick of Lorraine, and Peter of Amalfi. On 16 July 1054, after a series of acrimonious debates, the legates deposited a bull of excommunication against Kerullarios and his supporters on the high altar at Hagia Sophia. The patriarch responded in kind by excommunicating Humbert and his followers.