Roman Empire timeline (217-337 A.D.)

217-284: Crisis of the Third Century

260: Valerian murdered by Persians

268-9: Goths defeated

284: Diocletian restores order

284-305: Diocletian's reign (Tetrarchy)

301: Edict of Maximum Prices

303-11: The Great Persecution

305-337: Reign of Constantine

312: Battle of Mivian Bridge

313: Edict of Toleration

325: Council of Nicea

324-330: Constantinople founded

337: Constantine dies