The First Council of Nicea was the first Ecumenical Council of the Catholic Church, held in 325 on the occasion of the heresy of Arius (Arianism). As early as 320 or 321 St. Alexander, Bishop of Alexandria, convoked a council at Alexandria at which more than one hundred bishops from Egypt and Libya anathematized Arius. The latter continued to officiate in his church and to recruit followers. Being finally driven out, he went to Palestine and from there to Nicomedia. During this time St. Alexander published his "Epistola encyclica", to which Arius replied; but henceforth it was evident that the quarrel had gone beyond the possibility of human control. Sozomen even speaks of a Council of Bithynia which addressed an encyclical to all the bishops asking them to receive the Arians into the communion of the Church. This discord, and the war which soon broke out between Constantine and Licinius, added to the disorder and partly explains the progress of the religious conflict during the years 322-3. Finally Constantine, having conquered Licinius and become sole emperor, concerned himself with the re-establishment of religious peace as well as of civil order. He addressed letters to St. Alexander and to Arius deprecating these heated controversies regarding questions of no practical importance, and advising the adversaries to agree without delay. It was evident that the emperor did not then grasp the significance of the Arian controversy. Hosius of Cordova, his counsellor in religious matters, bore the imperial letter to Alexandria, but failed in his conciliatory mission. Seeing this, the emperor, perhaps advised by Hosius, judged no remedy more apt to restore peace in the Church than the convocation of an ecumenical council.
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