It appears you are looking for information about the division of the Roman Empire and its subsequent external challenges after the death of Emperor Constantine.
After Constantine's death in 337 AD, the Roman Empire faced numerous external pressures, including invasions by various barbarian tribes, internal strife, and economic troubles. The empire was formally divided into the Western and Eastern Roman Empires (later known as the Byzantine Empire) in the late 4th century, especially following the death of Theodosius I in 395 AD.
Here are some key external problems that contributed to the difficulties faced by the Roman Empire post-Constantine:
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Barbarian Invasions: Various tribes such as the Goths, Vandals, Huns, and Franks began invading Roman territories. The Visigoths famously sacked Rome in 410 AD.
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Persian Threat: The Sassanian Empire in the East posed a significant threat, particularly to the Eastern Roman Empire. Warfare with Persia drained resources and attention.
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Economic Decline: The empire faced economic difficulties, including inflation, heavy taxation, and reliance on slave labor which hampered technological advancements.
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Political Instability: After Constantine, there was a lack of strong central leadership in the West, and internal power struggles contributed to the decay of authority.
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Military Issues: The Roman legions became overextended and were often composed of non-Roman mercenaries, leading to issues of loyalty and effectiveness.
If you can provide a specific map or details about the problems depicted in it, I would be happy to help analyze those in particular. Feel free to ask any specific questions!