Dashed left edge = started before this timeline ·
Dashed right edge = still ongoing
Events in 337 1
306 – 337Constantine the GreatConstantine I reunites the empire after defeating his rivals — culminating in the defeat of Maxentius at the Milvian Bridge (312 AD), where Constantine reportedly sees a cross in the sky with the words "In this sign, conquer." Whether genuine vision or political calculation, Constantine legalises Christianity with the Edict of Milan (313 AD), convenes the Council of Nicaea (325 AD) and founds Constantinople (330 AD) as the empire's new capital on the Bosphorus. His conversion transforms Western history.