Diocletian establishes the Tetrarchy
Four emperors rule the empire at once
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In 293 Diocletian and his co-emperor Maximian appointed two junior emperors, the Caesars Galerius and Constantius Chlorus. Each of the four guarded his own stretch of frontier from his own seat — Nicomedia, Mediolanum, Sirmium and Trier — and Rome ceased to be where emperors lived.
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Meanwhile around the world (±25 years)
Asia
- 280 Jin reunifies China — 13 years earlier
Alive at the time
- Constantine the Great (aged 21)
- Anthony the Great (aged 42)