Arianism (Ἀρειανισμός, Areianismós) is a Christological doctrine first attributed to Arius (AD 256–336), a Christian presbyter from Alexandria, Egypt. Arian theology holds that Jesus Christ is the Son of God, who was begotten by God the Father with the difference that the Son of God did not always exist but was begotten/made before "time" by God the Father; therefore, Jesus was not coeternal with God the Father, but nonetheless Jesus began to exist outside time as time applies only to the creations of God.
Arius' trinitarian theology, later given an extreme form by Aetius and his disciple Eunomius and called anomoean ("dissimilar"), asserts a total dissimilarity between the Son and the Father. Arianism holds that the Son is distinct from the Father and therefore subordinate to him. The term Arian is derived from the name Arius; it was not what the followers of Arius' teachings called themselves, but rather a term used by outsiders. The nature of Arius's teachings and