jan 1, 293 - Diocletian split empire into four sections ruled by two co-emperors

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Diocletian delegated further in 293, appointing Galerius and Constantius as caesars, junior co-emperors. Under this “tetrarchy,” or “rule of four,” each emperor would rule over a quarter-division of the empire. He wanted to restore order, and since the Roman empire was so vast, it was easier to restore order and govern a smaller impire.

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