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The Virgin Nativity Cathedral
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 (Chalcedon) was held in 451 during the reign of the emperor Markian in Chalcedon to repudiate the Eutychian doctrine of monophysitism which emerged as a reaction to the Nestorian heresy. 630 priests proclaimed “one and the same Christ, Son, Lord, only begotten, to be acknowledged in two natures, inconfusedly, unchangeably, indivisibly, inseparably”. Feast day: 16 (29) July. |