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In page Ecumenical Patriarch of Constantinople:

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The (arch)bishopric of Constantinople has had a continuous history since the founding of the city in AD 330 by Constantine the Great. After Constantine the Great had enlarged Byzantium to make it into a second capital city in 330, it was thought appropriate that its bishop, once a suffragan of the Exarch of Thrace and Macedonia, the Metropolitan of Heraclea, should be elevated to an archbishopric.[1] For many decades the heads of the church of Rome opposed this ambition, due to their existing papal claims, and because they defended the 'Petrine principle' by which all Patriarchates were derived from Saint Peter and were unwilling to violate the old order of the hierarchy for political reasons.[citation needed]