In A.D. 286 the Roman emperor Diocletian break up in half the large Roman Empire administratively — and peacefully — beneath the management of two emperors.
A Western empire included a lot of modern-day Western Europe and northwest Africa. The Japanese half managed Japanese Europe and elements of Asia and northeastern Africa.
By 330 the Emperor Constantine institutionalized that break up by transferring the empire’s capital from Rome to his new imperial metropolis of Constantinople, based on the positioning of the outdated Greek polis of Byzantium.
The 2 administrative halves of the as soon as large empire continued to float