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May 31, 2026
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Diocletian (jan 1, 240 – jan 1, 311)

Description:

Diocletian’s “Tetrarchy” - 4 heads of state:
2 emperors (one E one W), and then a junior emperor behind each
◦ Junior emperors sometimes not satisfied (Constantine)

Added to timeline:

2 months ago
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Date:

jan 1, 240
jan 1, 311
~ 71 years