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Arianism comprises the theological positions made famous by the theologian Arius (c. AD 250-336), who lived and taught in Alexandria, Egypt, in the early 4th century. The most controversial of the teachings of Arius dealt with the relationship between God the Father and the person of Jesus and conflicted with trinitarian christological positions.
This article refers to other nontrinitarian theological systems of the fourth century, which regarded the Logos as a created being (as in Arianism proper and Anomeanism) or as neither uncreated nor created in the sense other beings are created (as in "Semi-Arianism"). This article calls all these systems Arianism.