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*325 Original [[Nicene Creed]] ratified at [[First Ecumenical Council]].
*330 Founding of Constantinople as New Rome, renaming the city of Byzantium.
*357 Pope [[Liberius of Rome|Liberius]] signs [[Semi-Arianism|Semi-Arian ]] creed (possibly under duress).
*379 Emperor Gratian permits Roman pope authority over neighboring bishops.
*381 Nicene Creed expanded at [[Second Ecumenical Council]].
