Byzantium By devinwilliams33 Period: 313 to 337 Reign of Constantine 325 Council of Nicaea Period: 329 to 379 Life of St. Basil of Caesarea 330 Transfer of Roman government to Constantinople Period: 527 to 565 Reign of Justinian Period: 717 to 741 Reign of Leo III Period: 726 to 843 Iconoclastic controversy Period: 800 to 900 Missions of St. Cyril and St. Methodius to the Slavs Period: 976 to 1025 Reign of Basil II, the "Bulgar-Slayer" 989 Conversion of Prince Vladimir of Kiev to Orthodox Christianity 1054 Beginning of the schism between the eastern and western Christian churches 1071 Battle of Manzikert Period: 1202 to 1204 Fourth Crusade 1453 Fall of Constantinople