300s | d=310s | dn1=320s | dn2=330s | dn3=340s }} Events By Place Roman Empire 8 October — War between Constantine I and Licinius: Licinius's defeated at the Battle of Cibalae and loses all of his territory in Europe. By Topic Religion January 11 — Pope Miltiades' reign ends. January 31 — Pope Sylvester I succeeds Pope Miltiades as the 33rd pope. August 30 — Council of Arles: Confirms the pronouncement of Donatism as a schism, and passes other canons. Synod of Anc… (More on 314)