270 Death of Claudius; Aurelian succeeds; regards Zenobia as a usurper; 272 defeats her at Antioch and Emesa; 273 captures Palmyra; takes Zenobia prisoner; puts Longinus, her secretary to death.
275 Emperor Tacitus; 282 Emperor Probus killed, near Sirmium.
286 Age of the emperors Diocletian and Maximianus.
305 Both resign their authority to enjoy private life; the first retires to Salona in Illyricum, and the other to Lucania.
306 Constantine the Great proclaimed emperor; 313 establishes Christianity as the religion of the empire; 315 defeats Licinius at Cibalis; 324 again at Adrianopolis; 328 removes the government from Rome to Byzantium.
338 Death of Constantine; succeeded by his sons Constantinus, Constantius and Constans.
348 Sapor defeats Constantius at Singara; 350 Constantius sole emperor; 351 defeats Magnentius at Mursa; 353, again at Mons Seleucus.
360 Julian the Apostate (emperor); 363 dies; next year Jovian dies.
367 Age of Ausonius (poet); 375 Emporor Gratian.