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180-284 The "Soldier Emperors"
Commodus, 180-192
Septimius Severus, 193-211
Aurelian, 270-275
212 Edict of Caracalla
227 Rise of the Sassanian or New Persian Empire
284 Reorganization of the Roman Empire by Diocletian
284-395 The "Absolute Emperors"
/Diocletian, 284-305
\Maximian, 286-305
Constantine I, 306-337
(sole emperor, 324-337)
Julian, 361-363