Diocletian a low-born Illyrian, rose to emperor in a period of crisis. Instead of waiting for another civil war to erupt, he appointed Maximian to co-rule with him, and handle the problematic western empire. But as problems with invading armies and usurpers continued, Diocletian took the dramatic step of appointing additional emperors in AD 293, establishing the Tetrarchy ('Rule of Four Men'). This militarized system concentrated power in the hands of four absolute autocrats, sidelining the Senate and marking the shift from Principate to Dominate.

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