Diocletian (Diocletianus, Gaius Aurelius Valerius) Map of the Roman Empire under the tetrarchy, showing the dioceses and the four tetrarchs’ zones of influence. The long-suffering people of the third-century Roman Empire had the distinct misfortune to live in interesting times. For three centuries before Constantine’s birth, Roman architects, engineers, and soldiers had crisscrossed the known […]

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