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230 CE
240 CE
250 CE
260 CE
270 CE
280 CE
235 CE - 284 CE: The Crisis of the Third Century in Rome; period of the Barracks Emperors.
260 CE: Postumus founds the "breakaway" Gallic Empire, seceding from Roman Empire.
270 CE: Zenobia breaks away from Roman Empire to found Palmyrene Empire.
272 CE: The Battle of Immae between the Roman forces under Aurelian and the Palmyrenes under Zenobia in which Rome triumphed.
272 CE: Aurelian defeats Zenobia at the Battle of Emesa; Palmyrene Empire falls to Rome.
274 CE: Aurelian defeats the forces of Tetricus I at the Battle of Chalons; Gallic Empire falls to Rome.
284 CE - 275 CE: Crisis of the Third Century resolved during the reign of Diocletian.