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Michael CarricoMichael Carrico
Updated:Apr 23, 2026
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Crisis of the Third Century: Usurpations, Invasions, and Breakaway States (235–284 CE)

Crisis of the Third Century: Usurpations, Invasions, and Breakaway States (235–284 CE)

  1. Maximinus Thrax proclaimed emperor

    Labels: Maximinus Thrax, Roman Army

  2. Year of the Six Emperors begins

    Labels: Gordian I, Gordian II, Senate

  3. Philip the Arab seizes imperial power

    Labels: Philip the, Sasanian Empire

  4. Decius proclaimed emperor on the Danube

    Labels: Decius, Danubian troops

  6. Trebonianus Gallus proclaimed emperor

    Labels: Trebonianus Gallus, Hostilian

  7. Valerian and Gallienus begin joint rule

    Labels: Valerian, Gallienus

  8. Valerian captured by Shapur I at Edessa

    Labels: Valerian, Shapur I

  9. Postumus establishes the Gallic Empire

    Labels: Postumus, Gallic Empire

  10. Battle of Naissus defeats Gothic coalition

    Labels: Battle of, Gothic coalition

  11. Aurelian proclaimed emperor by Danubian troops

    Labels: Aurelian, Danubian troops

  12. Aurelian defeats Zenobia and retakes Palmyra

    Labels: Aurelian, Zenobia

  13. Aurelian defeats Tetricus, ending Gallic Empire

    Labels: Aurelian, Tetricus I

  14. Diocletian proclaimed emperor after Numerian’s death

    Labels: Diocletian, Numerian