Diocletian made several changes to try to solve the Roman empire’s succession problem. He divided the empire into two halves, the Eastern and Western Roman Empires, and appointed two co-emperors, one for each half. He also created a system of four regional prefectures, each with its own governor, to help manage the empire. He also created a system of tetrarchy, in which four rulers would rule the empire together, with each ruler having a designated successor. Finally, he created a system of imperial bureaucracy to help manage the empire and its finances.
