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First Council of Constantinople

381

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First Council of Constantinople, (381), the second ecumenical council of the Christian church, summoned by the emperor Theodosius I and meeting in Constantinople. Doctrinally, it adopted what became known to the church as the Niceno-Constantinopolitan Creed (commonly referred to as the Nicene Creed), which effectively affirmed and developed the creed earlier promulgated at the Council of Nicaea in 325 (Creed of Nicaea).