In 285 AD, Gaius Aurelius Valerius Diocletianus, or Diocletian for short, became the undisputed master of the Roman Empire. With the support of the military and elimination of his rivals, he ended the 3rd century Crisis and brought stability back to the Empire. A year later, based on the idea that the Empire was too vast to be ruled by one man, he decided to share power with a co-emperor of his choosing: Marcus Aurelius Valerius Maximianus, or Maximian for short. Several years later, he divided

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