Original: Council of Ephesus (/O431/O) repudiated Nestorianism , proclaimed the Virgin Mary as the Theotokos ( '' Birth-giver to God '' , '' God-bearer '' , '' Mother of God '' ) , repudiated Pelagianism , and reaffirmed the Nicene Creed .
Simplified: Council of Ephesus , (/O431/O) ; proclaimed the Virgin Mary as the Theotokos ( Greek , '' God-bearer '' or more commonly '' Mother of God '' ) .