Topic: Tell me a short, interesting fact about

One interesting fact about the Roman Empire is that it was governed under a system known as diarchy, where power was shared between two emperors. This practice began in the 3rd century AD to ensure stability in the empire during times of crisis. Known as "co-emperors" or "Augusti," they each held the titles of Emperor and Caesar. The last known diarchy existed from 293 AD to 305 AD under emperors Diocletian and Maximian, during which they divided the empire into eastern and western halves and implemented administrative reforms that helped reorganize and strengthen the empire. However, this arrangement was short-lived and ended when Diocletian abdicated in 305 AD, marking the beginning of a new era in the history of the Roman Empire.