Byzantine Empire - First Council of Nicaea
Time: 325
Place: Nicaea, Roman Empire (Present-Day İznik, Turkey)
Details: Constantine established the principle that emperors could not settle questions of doctrine on their own but should instead summon general ecclesiastical councils for that purpose. His convening of both the Synod of Arles and the First Council of Nicaea indicated his interest in the unity of the Church and showcased his claim to be its head.
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