Institution

Tetrarchy

293 CE · 3rd century

The Tetrarchy was the system of imperial government established by Diocletian in 293 CE, under which the Roman Empire was ruled by four emperors: two senior Augusti and two junior Caesars. Each was responsible for a different region, allowing closer defence of the frontiers. The Tetrarchy and Constantine's reforms temporarily stabilised the empire after the crisis of the third century.

Tetrarchy
Image: Nino Barbieri · Public domain · Wikimedia Commons

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Roman EmpireDecline

See also

Cite this entry
APA
The Epoch Institute. (2026). Tetrarchy. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/tetrarchy
MLA
“Tetrarchy.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/tetrarchy. Accessed .
Chicago
The Epoch Institute. “Tetrarchy.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/tetrarchy.
Harvard
The Epoch Institute (2026) ‘Tetrarchy’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/tetrarchy (Accessed: ).

Last reviewed October 2026Random entry ↻