Pentarchy
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Pentarchy was a model of Church organization formulated in the laws of Emperor Justinian I of the Roman Empire. In this model, the Christian Church is governed by the heads of the five major episcopal
Christ Pantocrator mosaic from Hagia Sophia 2744 x 2900 pixels 3.1 MB
East–West Schism
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The East–West Schism, also known as the Great Schism or the Schism of 1054, is the break of communion between the Catholic Church and the Eastern Orthodox Church since 1054. A series of ecclesiastical
Pentarchy
…and afterward the concept of a "pentarchy" retained little more than symbolic significance. Tensions between East and West, which culminated in the East–West Schism, and the rise of powerful, largely independent metropolitan sees and patriarchates outside the Byzantine Empire in Bulgaria, and later in Serbia and…
Hagia Sophia, the cathedral of Constantinople at the time of the schism
Icon depicting the Emperor Constantine (centre) and the bishops of the First Council of Nicaea (325) holding the Niceno–Constantinopolitan Creed of 381
The division between the Eastern and Western Churches
Commemorative tablet of Catholic-Orthodox prayer at Saint Peter's Basilica, commemorating the meetings held between Pope Paul VI and Patriarch Athenagoras in 1967, and between Pope John Paul II and Patriarch Demetrios I of Constantinople in 1987.