By the time of Constantine’s death in 337 AD, the Roman Empire was unrecognizable from the one Severus had inherited. The Mediterranean world had shifted from a pagan, Rome-centered principate to a Christian, East-leaning autocracy. This "Late Antiquity" set the stage for the Byzantine Empire in the East and the eventual rise of medieval Europe in the West.
The Cyprian Plague decimated the workforce and the army. The Roman Empire from Severus to Constantine
The empire physically broke apart into three pieces: the Gallic Empire in the west, the Palmyrene Empire in the east, and the Roman core. Diocletian and the Tetrarchy (284–305 AD) By the time of Constantine’s death in 337
The transition from the Severan dynasty to the reign of Constantine the Great marks one of the most transformative periods in human history. It is the story of an empire that nearly collapsed under its own weight, only to be reinvented as a bureaucratic, militarized, and eventually Christian state. The Severan Dynasty: The Soldier-Emperors (193–235 AD) The Cyprian Plague decimated the workforce and the army
Germanic tribes crossed the Rhine and Danube, while the Sassanid Persians pressured the East.
After Diocletian’s retirement, the Tetrarchy dissolved into civil war. Out of the smoke emerged . Following his victory at the Battle of the Milvian Bridge in 312 AD—where he claimed to have seen a vision of a cross in the sky—Constantine fundamentally altered the course of Western civilization.
Recognizing that the empire’s wealth and threats were now in the East, he moved the capital to Byzantium, renaming it "New Rome" (Constantinople). Conclusion