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.

Turmoil resumed following Emperor Aurelian’s assassination in AD 275. Rapidly changing emperors, barbarian invasions and internal strife defined the years 275-284. Within this chaos, Diocles, a low-born Dalmatian soldier, seized power in 284. But instead of joining the long list of warlords that only temporarily won power before falling in civil war, he laid a new foundation for a transformative era in Roman politics.

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Students often ask me for Roman Empire book recommendations. Listeners have as well. It is easy to find popular histories, but here I discuss eleven excellent hidden gems--books that are great for the causal reader, but robust enough that I’ve used them in my research and teaching. These aren’t popular titles, but they’re brilliantly crafted by leading academics, diving deep into Rome’s history, culture, religion and economy. Each book is well-written, accessible, and budget-friendly, perfect for history fans and students eager to explore Rome’s epic story.