Analysis of information sources in references of the Wikipedia article "Trajan's Parthian campaign" in English language version.
His successor Hadrian recognized only too clearly that apart from a few spectacular but momentary successes, such as the capture of Ctesiphon and the advance to the Persian gulf, Trajan's campaign had produced little of value for Rome. Thus more peaceful times returned. The Euphrates once again became the frontier and Rome relinquished Armenia, Mesopotamia, and Assyria, a province re-established by Trajan, which corresponded roughly to the territory of ancient Babylonia.
