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Events 
 January 11 – Pope Miltiades ends his reign as the Catholic Pope.
 August 30 – Council of Arles, which confirmed the pronouncement of Donatism as a schism, and passed other canons.
 Synod of Ancyra: consulting a magician is declared a sin earning five years of penance.
 Pope Silvester I succeeds Pope Miltiades.
 Alexander becomes Bishop of Byzantium.