Ruler · 240 – 316

Diocletian

Lived 240 – 316; monarch, politician. Roman emperor of Ancient Rome, 284 – 305; also in the line of Roman Empire.

For the full story, the article on Wikipedia (CC BY-SA 4.0); this page holds what the record says of the reign.

Lived: 240 – 316; 76 years
In office: 21 years; one reign
Lines: 2; states
Left it: left office alive; read off the dates alone

Roman emperor

Ancient Rome · the 817th of 845 dated reigns · 753 BCE – 480

813 before

Diocletian284 – 305

Constantius Chlorus305 – 306

Galerius305 – 311

25 after

killed, executed or dead in battledeposed, abdicated, exiled or removeddied in officeleft alive by a regular roadending not on recorda second row: a reign that began before the last had ended — rival claimants, or a shared thronethis entry

Reigned 284 – 305 · 21 years · came to it aged 44

Left it: left office aliveread off the dates alone: the term ends in 305; they died in 316

Also in the line of Roman Empire (57th of 79).

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Diocletian in the atlas: the article, every line they sat in, and the map in their years.
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Wikidata Q43107 (CC0) · the reigns from Wikidata's P39 terms, the rulers' own articles read by grammar (sentences quoted above, CC BY-SA 4.0) and Kokkonen & Sundell where they code the line · data built 2026-10-06 · Pastlas v2.9.1, by Oleh Voronko. The published atlas and its data are for non-commercial use.