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The Virgin Nativity Cathedral
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 (Constantinople) was convened by the emperor Theodosius in 381 to address the issue of the Macedonian heresy. 150 bishops including Gregory the Theologian took part in it. It confirmed the Nicene Creed by having expanded it in response to the heresy. Thus it was finally approved as the Necene Creed which is still used in the Orthodox Church. Feast day: 22 May (4 June). |