Санта-Мария-ин-Домника
These two letters were entrusted to a delegation of three legates, headed by the undiplomatic cardinal Humbert of Silva Candida, and also including Frederick of Lorraine, who was papal secretary and Cardinal-Deacon of Santa Maria in Domnica, and Peter, Archbishop of Amalfi. They were given friendship and support by the emperor but were spurned by the patriarch. Finally, on 16 July 1054, three months after Pope Leo's death in April 1054 and nine months before the next pope took office, they laid on the altar of Hagia Sophia, which was prepared for the celebration of the Divine Liturgy, a bull of excommunication of Cerularius and his supporters. At a synod held on 20 July 1054, Cerularius in turn excommunicated the legates. In reality, only Michael may have been excommunicated along with his then-living adherents.