Arian subscription

Arianism is a nontrinitarianChristological doctrine which asserts the belief that Jesus Christ is the Son of God who was begotten by God the Father at a point in time, a creature distinct from the Father and is therefore subordinate to him, but the Son is also God (i.e. God the Son). Arian teachings were first attributed to Arius (c. AD 256–336), a Christian presbyter in Alexandria of Egypt. The teachings of Arius and his supporters were opposed to the theological views held by Homoousian Christians, regarding the nature of the Trinity and the nature of Christ. The Arian concept of Christ is based on the belief that the Son of God did not always exist but was begotten by God the Father.

There was a dispute between two interpretations (Arianism and Homoousianism) based upon the theological orthodoxy of the time, and both of them attempted to solve its theological dilemmas. So there were, initially, two equally orthodox interpretations which initiated a conflict in order to attract adepts and define the new orthodoxy.Homoousianism was formally affirmed by the first two Ecumenical Councils. The Ecumenical First Council of Nicaea of 325 deemed Arianism to be a heresy. All mainstream branches of Christianity now consider Arianism to be heterodox and heretical.

According to Everett Ferguson, "The great majority of Christians had no clear views about the nature of the Trinity and they did not understand what was at stake in the issues that surrounded it." At the regional First Synod of Tyre in 335 (attended by 310 bishops), Arius was exonerated.Constantine the Great was baptized by the Arian bishop Eusebius of Nicomedia. After the deaths of both Arius and Constantine, Arius was again anathemised and pronounced a heretic again at the Ecumenical First Council of Constantinople of 381 (attended by 150 bishops). The Roman Emperors Constantius II (337–361) and Valens (364–378) were Arians or Semi-Arians, as was the first King of Italy, Odoacer (433?–493), and the Lombards were also Arians or Semi-Arians until the 7th century. Visigothic Spain was Arian until 581.

...
Wikipedia