Answer:
Diocletian's division of the Empire
Step-by-step explanation:
The Roman Empire was huge and it was extremely hard to handle, with rampant corruption and overwhelming military expenses, and ultimately defeats, Diocletian's solution was to divide the empire's rule between four people. He was the Emperor, but he also had an Augustus (co-emperor) and two Caesars (junior emperors). Diocletian's reforms only made Rome bureaucracy larger, and it was already large and burdensome. The Western Roman Empire fell much earlier (5th century) than the Eastern Roman Empire (Constantinople) which lasted until the 15th century.