Editing First Council of Constantinople (section)

===Geopolitical context===
Theodosius' strong commitment to Nicene Christianity involved a calculated risk because Constantinople, the imperial capital of the Eastern Empire, was solidly Arian. To complicate matters, the two leading factions of Nicene Christianity in the East, the Alexandrians and the supporters of Meletius in Antioch, were "bitterly divided ... almost to the point of complete animosity".<ref name="McGuckinP235">McGuckin, p. 235</ref>

The bishops of Alexandria and Rome had worked over a number of years to keep the see of Constantinople from stabilizing. Thus, when Gregory was selected as a candidate for the bishopric of Constantinople, both Alexandria and Rome opposed him because of his Antiochene background.{{Citation needed|date=May 2021}}