Tensions gradually mounted between the Greek-speaking East and the Latin-speaking West. Disagreements over papal supremacy and the Filioque clause (the insertion of "and the Son" into the Creed by the Western Church) led to the Great Schism in 1054. This event formally divided the Chalcedonian Church into the Roman Catholic Church and the Eastern Orthodox Church. Captivity and Expansion
The breaking point of 1054 and the Fall of Constantinople (1453). Istoria Biserici Ortodoxe
The "Rum Millet" system under Ottoman occupation. Istoria Biserici Ortodoxe