Diocletian

Augustus of the Eastern Roman Empire (244-311)

Source-basedFalling

Lived 240–316, aged 76

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Era
240–316
Aged 76

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Summary

Updated 2026-05-29

Rose from Dalmatia's nobody status to run the Roman Empire for 21 years, then actually retired—a rarity for the job. Reorganized everything from the military to the bureaucracy, and somehow didn't die fighting over power like most of his predecessors.

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Diocletian, nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia. As with other Illyrian soldiers of the period, Diocles rose through the ranks of the military early in his career, serving under Aurelian and Probus, and eventually becoming a cavalry commander for the army of Emperor Carus. After the deaths of Carus and his son Numerian on a campaign in Persia, Diocles was proclaimed emperor by the troops, taking the name "Diocletianus". The title was also claimed by Carus's surviving son, Carin…

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