Hadrian abandons Trajan's eastern conquests
On succeeding Trajan in 117 AD, Hadrian gave up the newly conquered provinces of Mesopotamia, Assyria and Armenia and pulled the frontier back to the Euphrates. He knew this would look like weakness and would anger Trajan's generals. He accepted that cost because he judged the empire could not hold, garrison and govern the territory. It is a case of a new ruler reversing his predecessor's signature achievement because consolidating what he had was worth more than keeping prestige gains he could not sustain.