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The Council of Nicaea
The First Council of Nicaea (AD 325), convened by Emperor Constantine, brought together the bishops of the Roman Empire to resolve the Arian controversy. It affirmed the consubstantiality of Christ with the Father, adopted the Nicene Creed still used today, set the date of Easter and strengthened the alliance between the Church and the Roman Empire, thus laying the doctrinal and liturgical foundations of Christianity.