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Known as the period of Military Anarchy and Imperial Crisis, this period started off with the assassination of Servus Alexander.
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Diocletian split the Roman Empire into two pieces, and added junior emperors, making a total of four Caesar's.When Diocletian and Maximian abdictated their co-rulers, civil war broke out.
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In 312, the emperor Constantine defeated his co-emperor Maxentius at the Milvian Bridge and became sole ruler. Later Constantine defeated the Eastern Ruler and then became sole ruler for the whole Roman Empire
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The Roman Emperor Julian also known as Julian the Apostate attempted to reverse the religious trend to Christianity. He failed and died in the East fighting the Parthians.
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Eastern Roman Empire Flavius Julius Valens Augustus fought and was defeated and killed by the Visigoths at the Battle of Adrianople.
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After Valen's death Thedosius briefly reunited the Empire but it didn't last beyond his reign. At his death the Empire was divided by his sons Arcadius in the East and Honorius in the West.
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Visigoths made several successful incursions into Italy beginning in 401 C.E. This is often given as the official date of The Fall of Rome.
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The central Asians Huns led by their king Attila threatend Rome, were paid off, then attacked agin.
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Vandals plunder Rome amounting to the fourth sack of the city but by an agreement with Pope Leo the first that they injure few people or buildings.
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The last western emperor Romulus Augustulus is deposed by the barbarian general Odoacer who then rules Italy.