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.