Why did emperor adrian abandon trajan's conquests?

The rebellion was suppressed in 117 AD by Trajan's lieutenant Lusius Quietus, but it showed Hadrian that Rome's eastern provinces weren't secure and annexing Mesopotamia, Armenia, and Assyria would have overextended the empire. read more

Hadrian: Hadrian, Roman emperor (117–138 ce), the emperor Trajan’s cousin and successor, who was a cultivated admirer of Greek civilization and who unified and consolidated Rome’s vast empire. He was the third of the so-called Five Good Emperors. read more

The Roman Empire (red) and its clients (pink) in 117 AD during the reign of emperor Trajan. (©Tataryn77 – Wikipedia) Hadrian’s first important act was to abandon the conquests of Trajan beyond the Euphrates (Assyria, Mesopotamia and Armenia). read more