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Michael I Cerularius

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Michael I Cerularius was a powerful religious leader in the 11th century. He served as the Ecumenical Patriarch of Constantinople from 1043 to 1059.

Lead seal of Michael Keroularios
Lead seal of Michael Keroularios

A patriarch is a high-ranking leader in the Eastern Church. Michael's leadership was marked by intense theological and political conflicts. These disputes eventually helped cause the Great Schism of 1054. This event permanently divided the Christian world into different branches. Michael was born in Constantinople around the year 1000.

The primary conflict involved Michael and Pope Leo IX. They disagreed on several important church practices. One major issue was the use of unleavened bread in the Eucharist. The Roman Church used this type of bread, but the Greek Church did not. They also argued over the Filioque clause, which involves specific religious wording. Cultural differences and the issue of papal supremacy added to the tension. The Pope claimed supreme authority over the entire Church. Michael disagreed with this view of power.

In 1054, Pope Leo IX sent a formal delegation to Constantinople. This group included Cardinal Humbert of Silva Candida, Frederick of Lorraine, and Archbishop Peter of Amalfi. These men were called legates because they represented the Pope. While they were in the city, news arrived that Pope Leo IX had died on April 19. This death created an awkward situation for the legates. Their official authority depended entirely on the person who sent them. Despite this, the legates decided to continue their mission.

Relations between the legates and Michael grew very tense. Michael refused to meet the envoys in their official capacity for months. He viewed their informal religious discussions as inappropriate. On July 16, 1054, the legates took a drastic step. They entered the Hagia Sophia church during a divine liturgy. There, they placed a charter of excommunication on the altar. This document targeted Michael, Archbishop Leo of Ohrid, and their followers. Excommunication is a formal act that removes someone from the church community.

Michael responded to this action with a formal meeting. On July 20, 1054, he presided over a synod of 21 metropolitans and bishops. This council decided to excommunicate the papal legates in return. They issued a conciliar anathema, which is a formal religious curse or ban. This announcement was officially proclaimed in the Hagia Sophia on July 24. These events led to the East-West Schism. This split ended the alliance between the Byzantine emperors and the Popes. It changed the political and religious map of Europe for centuries.

Michael's life was also defined by his involvement in Byzantine politics. He had a difficult relationship with Empress Theodora Porphyrogenita. The historian Michael Psellos noted that Michael was unhappy with her rule. He was specifically vexed that the empire was governed by a woman. Later, Michael helped negotiate the abdication of Emperor Michael VI in 1057. He supported the general Isaac I Komnenos to take the throne. However, Michael and Isaac soon quarreled over church property.

Conflict with the emperor eventually led to Michael's downfall. Michael even wore purple shoes, which were symbols reserved for the emperor. This act was seen as a challenge to Isaac I. Consequently, the emperor exiled Michael to Proconnesus in 1058. Accusations of heresy and treason were drawn up against him. Michael died in 1059 before his trial could take place. The division he was part of lasted for many hundreds of years. In 1965, Pope Paul VI and Patriarch Athenagoras met to rescind the excommunications. This was a major step toward restoring communion between the two sides.

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File:Lead seal of Michael Keroularios.jpg
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