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Arianism, in Christianity, the Christological (concerning the doctrine of Christ) position that Jesus, as the Son of God, was created by God. It was proposed early in the 4th century by the Alexandrian presbyter Arius and was popular throughout much of the Eastern and Western Roman empires, even after it was denounced as a heresy by the First Council of Nicaea in 325. Arianism is often considered to be a form of Unitarian theology in...