Council of Ephesus
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The Council of Ephesus was a council of Christian bishops convened in Ephesus in AD 431 by the Roman Emperor Theodosius II. Wikipedia
Accepted by: Catholic Church; Eastern Orthodox Church; Oriental Orthodox Churches; Anglican Communion; Lutheranism; Calvinism
Attendance: 200–250 (papal representatives arrived late)
Documents and statements: Confirmation of the original Nicene Creed, condemnations of heresies, declaration of Mary as "Theotokos", eight canons
President: Cyril of Alexandria