Although previous emperors had divided the Empire into eastern and western halves, Diocletian Antonianus split the administration of the Empire into four separate sections, a system known as the Tetrarchy.
Diocletian ruled the eastern Empire and installed Maximian as his co-emperor in the west. Subordinate to these two “Augusti”, or senior emperors, were two “Caesars”, Galerius Maximianus in the east and Julius Constantius in the west. The Caesars were officially adopted by their emperors, in order to establish them as the legitimate heirs to power and thus discourage conspiracies by outsiders to usurp the Augusti.
The Tetrarchy worked well for as long as Diocletian remained in power. In 305 he decided it was time f…
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Citation: Editors, Litencyc. "Division of the Roman empire; Diocletian and the Tetrarchy". The Literary Encyclopedia. First published 16 November 2005 [https://staging.litencyc.com/php/stopics.php?rec=true&UID=1626, accessed 23 November 2024.]