Michael was a leader in a church. 
Michael was a church leader. 
He lived a long time ago. He had many big fights with others. These fights were about how to pray. One fight was about bread used in church.
Michael also disagreed with the Pope. The Pope sent men to talk to him. But the men and Michael did not get along. They even told each other they were not part of their group.
This big split changed the church forever. It lasted for a very long time. Later, leaders met to fix the bond. It was a very big deal in history.
Michael I was a leader of the church in Constantinople. 
Michael and Pope Leo IX also disagreed about power. The Pope sent a group of men to talk to Michael. These men were called legates. They were sent to represent the Pope. Soon after they arrived, Pope Leo IX died. This made things very hard for the messengers. They still tried to talk with Michael, but they did not get along.
In 1054, the messengers wrote a paper to kick Michael out of the church. This is called excommunication. Michael then did the same to them. This big split is called the Great Schism. It divided the church into two parts. This split lasted for hundreds of years. In 1965, leaders from both sides met to fix the bond. This was a big step toward making peace.
Michael I Cerularius was a very powerful religious leader. He served as the Ecumenical Patriarch of Constantinople from 1043 to 1059. 
Many arguments broke out between Michael and Pope Leo IX. They disagreed about how to perform special church services. One big fight was about the type of bread used in the Eucharist. The Roman Church used unleavened bread, but the Greek Church did not. They also argued about who should have the most power in the Church. The Pope believed he had supreme authority over all other leaders. Michael did not agree with this view of power. They even disagreed about certain religious words and cultural customs.
In 1054, a group of messengers arrived to meet with Michael. These men were called legates and they represented Pope Leo IX. 
Michael reacted quickly to this move by his opponents. He held a meeting with 21 bishops and metropolitans in Constantinople. 
Michael also had many conflicts with the leaders of the empire. He sometimes argued with Empress Theodora about how she ruled. He even helped a general named Isaac I Komnenos take the throne. 
Michael I Cerularius was a powerful religious leader in the 11th century. He served as the Ecumenical Patriarch of Constantinople from 1043 to 1059. 
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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