PENTARCHY

"The pentarchy of five seas in the Mediterranean region includes the Aegean Sea, the Black Sea, the Adriatic Sea, the Ionian Sea, and the Tyrrhenian Sea."

"The five major bishops of Rome, Constantinople, Antioch, Jerusalem, and Alexandria formed the historical pentarchy of the early Christian Church."

"During the Byzantine Empire, the pentarchy held significant ecclesiastical authority and influence over the Christian world."

"The pentarchy system ensured that decisions within the Church required the consensus of the five bishops."

"Following the Great Schism, the unity of the pentarchy was fractured, leading to a division between the Eastern Orthodox and Roman Catholic Churches."