The Great Schism Notes

In 1054, Pope Leo IX sent Cardinal Humbert to Constantinople to meet with Patriarch Michael Cerularios.
The mission aimed for conciliation but resulted in mutual excommunication, marking the Great Schism.
The schism formalized the separation of Rome and Constantinople into distinct Christian Churches.
This split was the culmination of centuries of conflict, reflecting deep-seated tensions between the eastern and western Roman empires.
The division was likely inevitable due to unresolved theological disputes and growing political and cultural differences.

The Mediterranean civil centers became crucial strongholds for the early Christian Church.
Disciples spread their ministries throughout the population centers of the time.
Key cities like Antioch, Rome, and Alexandria attracted apostles and became centers for evangelization.
Constantine's conversion provided the Church with a political framework for growth.
The Church's history paralleled the Roman Empire's for the subsequent millennium.

Byzantium was transformed into Constantinople, the "New Rome," in 330 AD, becoming a Christian center.
The Church organized into patriarchates: Rome, Constantinople, Alexandria, Antioch, and Jerusalem.
These patriarchates represented distinct peoples and cultures despite the empire's political unity.
Liturgies developed in the 2nd-4th centuries, reflecting local cultures with different vestments, music, and art.
Constantinople grew into the most prominent eastern patriarchate, especially after Emperor Theodosius formally established it as the Eastern Roman Empire's capital in 395 AD.
The liturgical tradition of Constantinople, the Byzantine Rite, is attributed to St. John Chrysostom and became widely practiced due to the city's prominence and missionary activities.

Ecumenical councils were conceived to maintain unity and define Catholic doctrine.
The first seven councils (325-787 AD) are recognized by the Catholic Church and Byzantine Rite Christians.
These councils aimed to foster unity but also led to major separations.
The Trinitarian doctrine from the first two councils was universally accepted.
- However, Nestorius's theology was condemned during the third council, leading to the development of a separate Nestorian Church.
A significant rift occurred at the Council of Chalcedon in 451 AD.
- Disagreements over the dual nature of Christ (divine and human) caused many representatives from Alexandria, Antioch, and Armenia to reject the terminology and establish themselves as non-Chalcedonians.

Cultural differences and terminological misunderstandings intensified disagreements.
External pressures on the Roman Empire further strained Christian unity.
After Muhammad's death in the 7th century, Muslim conquests captured Jerusalem, Antioch, and Alexandria, leaving Constantinople as the only free eastern patriarchate.
The Western Roman Empire faced Barbarian invasions, leading to the papacy's rise as the dominant political entity in Rome.
- Popes exercised political authority, while Byzantine patriarchs primarily controlled church affairs, causing friction as patriarchs felt the papacy gained undue prominence.
Continued invasions and the growth of Islam isolated Rome from Constantinople, making travel dangerous and shifting papal focus to Western Europe.

Differing orientations were reinforced by missionary activities.
Constantinople focused on Eastern Europe, with Byzantine missionaries spreading their liturgical rite into Slavic lands, including Russia and Ukraine, by the 10th century.
Saints Cyril and Methodius were sent from Constantinople to Greater Moravia to Christianize the region.
- Despite strained relations, St. Cyril obtained papal approval to translate Scripture into vernacular languages and developed the Cyrillic alphabet due to the Greek alphabet's inadequacy.

Missionary expansion contributed to a temporary schism in the 9th century (861-867) when Pope Nicholas I and Patriarch Photius excommunicated each other over control of the emerging church in Bulgaria.
The filioque, the western insertion of "and the Son" into the Nicene Creed, was also a point of contention.
While relations were restored, the core issue of papal primacy remained unresolved.

Rome viewed itself as the senior patriarchate, established by Christ and affirmed by early councils.
Eastern patriarchs did not consistently recognize papal authority.
After the 11th century, few eastern Christians acknowledged papal authority.

The schism led to the formation of the Byzantine or Orthodox Church which shares a common heritage and doctrine from the first seven ecumenical councils but is not aligned with the Roman Catholic Church.
The Orthodox Church continues to exist in various forms today.
Many Eastern Rite Christians are now in communion with the Pope.