Humbert of Mourmoutiers

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Humbert of Mourmoutiers (c.1015 – 5 May 1061) was a French prelate, Roman Catholic cardinal and Benedictine oblate, donated by his parents to the monastery of Mourmoutiers in Lorraine. He was invited to Rome in 1049 by the reformer Pope Leo IX, who made him archbishop of Sicily in 1050 (though the Normans prevented his landing there) and then cardinal-bishop of Silva Candida.

Under Leo, he became the principal papal secretary and on a trip through Apulia in 1053, he received from Bishop John of Trani the letter from Leo, Archbishop of Ochrid, criticising Western rites and practice. He translated the Greek letter into Latin and gave it to the pope, who ordered a response drawn up. This exchange led to Humbert being sent at the head of a legatine mission with Frederick of Lorraine, later Pope Stephen IX, and Peter, archbishop of Amalfi, to Constantinople to confront Patriarch Michael Cerularius. He was cordially welcomed by the Emperor Constantine IX, but spurned by the patriarch. Eventually, on 16 July 1054, despite the fact that Leo had died and the excommunication was invalid, he laid the excommunication on the high altar of the church of the Hagia Sophia during the celebration of the liturgy. This caused the Great Schism and marked the official separation of the Roman Church from the Orthodox Church.

In his later years, he was made librarian of the papal curia by Stephen IX, his former legatine companion, and he penned the reform treatise Lib tres adversus Simoniacos (both 1057).