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IOTL, the theory of the metropolitans of Rome, Alexandria, and Antioch (the 3 Petrine churches) and the additions of Jerusalem and Constantinople was pushed forth by the Eastern Romans, particularly by Justinian. Rome, Alexandria, and Constantinople would become the heads of 3 major Christian denominations (Catholic, Oriental Orthodox, and Eastern Orthodox) which had competing patriarchs for Jerusalem and Antioch.

What if things had gone differently and the bishops of other cities gained greater prominence leading to their church as part of the "pentarchy"? One major church in communion with itself was the Church of the East, aka the Nestorians, headquartered in Seleukia-Ctesiphon, split off during the Nestorian schism. Another region with a famous schism was Africa with the Donatists in Carthage. Within the Eastern Roman Empire, other prominent bishops included Ephesus(diocese of Asia) and Caesarea in Cappadocia(diocese of Pontus) which were both absorbed into Constantinople's jurisdiction. How would this effect the development of the early church?
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