The collapse was halted by , a pragmatic reformer who realized the empire was too large for one man to rule. He established the Tetrarchy (Rule of Four), dividing the empire into Eastern and Western halves, each governed by an "Augustus" and a junior "Caesar."
Constantine legalized Christianity, moving it from a persecuted cult to the favored religion of the state. The Roman Empire from Severus to Constantine
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 collapse was halted by , a pragmatic
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 Mediterranean world had shifted from a pagan,
Severus shifted the empire’s power base away from the Senate and toward the military. While this provided short-term stability, it created a dangerous precedent. His successors, including the notorious , expanded citizenship to nearly all free inhabitants of the empire (the Constitutio Antoniniana ), primarily to increase tax revenue for a ballooning military budget. However, the dynasty ended in chaos with the assassination of Alexander Severus in 235 AD, triggering a half-century of near-total collapse. The Crisis of the Third Century (235–284 AD)