Year of the Six Emperors (238)
Reign of Gordian III (238–244)
Reign of Philip the Arab (244–249)
Reign of Decius and Herennius Etruscus (249–251)
Reign of Trebonianus Gallus (251–253)
Reign of Aemilianus (253)
Reign of Valerian and Gallienus (253–260)
Reign of Gallienus (260–268)
Reign of Claudius II (268–270)
Reign of Aurelian (270–275)