Gaius Aurelius Valerius Diocletianus (c. 236-316), born Diocles (
Greek Διοκλής) and known in English as Diocletian, was
Roman Emperor from
November 20 284 to
May 1 305. Diocletian brought an end to the period popularly known to historians as the "
Crisis of the Third Century" (235–284). He established an
autocratic government and was responsible for laying the groundwork for the second phase of the
Roman Empire, which is known variously as the "
Dominate" (as opposed to the
Principate instituted by
Augustus), the "
Tetrarchy", or simply the "Later Roman Empire". Diocletian's reforms fundamentally changed the structure of imperial government and helped stabilize the empire economically and militarily, enabling it to remain essentially intact for another hundred years.
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