Arian controversy
The Arian controversy was in reality a series of controversies, related to Christology, that arose between Arius, a priest and theologian, and Bishop Athanasius, a Church Father. The most important of these controversies concerned the substantial relationship between God the Father and Jesus Christ. These disagreements divided the Church
into two opposing theological factions for over 55 years, from the time before the Council of Nicaea in 325 until after the Council of Constantinople in 381. There was no formal resolution or formal schism; The Catholic church eventually formed its own theology on this matter.
History
Beginnings
The early history of the controversy must be pieced together from about 35 documents found in various sources. The Trinitarian historian Socrates of Constantinople reports that Arius first became controversial under the bishop Athanasius of Alexandria, when Arius made the following syllogism: he said, "If the Father begat the Son, he that was begotten had a beginning of existence: and from this it is evident, that there was a time when the Son was not. It therefore necessarily follows, that he had his substance from nothing".