Arianism 

Named after Arius, this heresy maintained that God the Father alone is eternal and made His Son to be the first creature He created ex nihilo. Some Arians went on to teach that the Holy Spirit was the first and greatest creature produced by the Son. The Council of Nicea met in A.D. 325 to deal with the subject, and it firmly rejected Arianism. It held that the Son was of the same substance with the Father (homoousion), not merely of similar substance (homoiousion), pronouncing its Scriptural faith that the Son was, "Son of God, light of light, very God of very God, being of one substance with the Father" The Nicene decision was upheld in A.D. 381 by the Council of Constantinople.

Cairns, A. (2002). In Dictionary of Theological Terms (p. 40). Belfast; Greenville, SC: Ambassador Emerald International.

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