Subordinationism
Alexander and Arius had a disagreement that occurred during the Arian Controversy, which started in the year 318 or 319. At the beginning, no one knew the exact answer. Arius (c. 250–336), a priest of Alexandria, Egypt, had an argument with Alexander, who was the bishop of the church in that city, about his obvious carelessness in blurring the difference of nature between the Father and the Son, as he believed in the eternal Sonship of the Son (that the Son was always the Son since the beginning).