Diocletian was the last Roman emperor to rule the entire empire. He ordered the shared rulership upon his retirement.
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He was a Roman emperor but he mostly governed the Eastern half of the empire
No. Constantine defeated a rival general named Severus to become Emperor of Rome. In fact, Diocletian was the first emperor to abdicate, and he lived out the rest of his life quietly.
The council that helped rule Rome was the senate.The council that helped rule Rome was the senate.The council that helped rule Rome was the senate.The council that helped rule Rome was the senate.The council that helped rule Rome was the senate.The council that helped rule Rome was the senate.The council that helped rule Rome was the senate.The council that helped rule Rome was the senate.The council that helped rule Rome was the senate.
Diocletian first pushed back the Sassanids and the Germans. Then he ended the revolts. Then he tried to solve the problem of the civil wars between the two halves of the army. Diocletian worked out a system where there would always be two Emperors, and each of these Emperors would have two assistants. This system is called the Tetrarchy (rule of four). When one of the Emperors died, his assistant would move up to being Emperor, and choose a new assistant.
Diocletian realized the Roman Empire was too large for one man to rule well.