08/07/2026
The Great Schism of 1054: When the Church Divided
The Great Schism of 1054 was one of the most important events in Christian history. It marked the formal separation between the Church in the West and the Church in the East. Before 1054, Christians in both the Eastern and Western parts of the Church were united in one Catholic (universal) Church, even though they had differences in language, culture, and local customs.
The Western Church was centred in Rome and used Latin in its worship. The Eastern Church was centred in Constantinople and used Greek. For many centuries, these two parts of the Church worked together, but tensions slowly grew.
One major issue was the role of the Bishop of Rome, the Pope. The Western Church believed that the Pope had universal authority over the whole Church. The Eastern bishops honoured the Pope as the first among the bishops but did not accept that he had supreme authority over every local church.
Another disagreement involved the Nicene Creed. The Western Church added the words ''Filioque'', meaning "and the Son," to the section about the Holy Spirit. The Eastern Church objected, arguing that no one had the authority to change a creed that had been approved by an Ecumenical Council.
There were also differences in worship and practice. For example, the Western Church normally used unleavened bread for the Eucharist, while the Eastern Church used leavened bread. These differences alone did not divide the Church, but they added to the growing tension.
The breaking point came in 1054. Pope Leo IX sent Cardinal Humbert to Constantinople to settle disputes with Patriarch Michael Cerularius. The talks failed, and drama ensued. Unbeknownst to the delegation at the time, Pope Leo IX had actually died three months prior. This meant that Cardinal Humbert's official authority had technically expired under canon law.
Nevertheless, on July 16, 1054, Humbert marched into the Hagia Sophia and placed a document of excommunication on the altar. In response, the Patriarch and his bishops declared the papal delegation excommunicated. Crucially, these were personal excommunications aimed at specific individuals rather than a blanket condemnation of the entire Western or Eastern population. While everyday Christians did not immediately realize how serious the event would become, it set a dangerous precedent.
The true point of no return came generations later in 1204, during the Fourth Crusade. Western Christian crusaders, diverted from their original mission, brutally sacked and looted Constantinople, destroying Eastern churches and deepening the cultural wounds between the two regions. This physical betrayal cemented the theological divisions of 1054 into a permanent rift.
After the Schism, the Western Church became known as the Roman Catholic Church, while the Eastern Church became known as the Eastern Orthodox Church. Both churches continued to preserve apostolic succession, celebrate the sacraments, and maintain much of the faith they had received from the early Church, but they remained separated.
The Great Schism reminds us that division in the Church usually happens over time. It is often the result of many disagreements, misunderstandings, and struggles over authority rather than a single event. More than nine centuries later, the separation between the Roman Catholic and Eastern Orthodox Churches still exists, although both have made efforts to improve relations through dialogue and mutual respect.
