The Roman Empire at its Greatest Extent, 117 AD
The empire at the death of Trajan in 117 AD, from Britain to Mesopotamia — the greatest territorial extent Rome ever reached.
When Trajan died in August 117 AD the empire stretched from the Atlantic to the Persian Gulf: some five million square kilometres and perhaps a fifth of humanity under a single administration. His successor Hadrian judged the newest conquests in Mesopotamia indefensible and withdrew to the Euphrates within a year — making this map the high-water mark of Roman power. See the fall of the Roman Empire.
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