Chalcedon, Council of
(451) Fourth ecumenical council of the Christian Church, held in Chalcedon (modern Kadiköy, Tur.). Called by the emperor Marcian, it approved the creeds of Nicaea (325) and Constantinople (381; later known as the Nicene Creed). It also approved the Tome of Pope Leo I confirming the two distinct natures in Christ and rejecting the Monophysite heresy. The council then explained these doctrines in its own confession of faith. The council disciplined clergy and declared Jerusalem and Constantinople patriarchates.
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