"his Parthian campaign" . . "Trajan's Parthian Campaign" . "Trajan's invasion of Parthia" . . . "Parthian War" . . . . "campaign against Parthia" . "* Adiabene conquered by Rome" . "expedition against the Parthians" . . . . . . . . . "Parthian war" . . "Trajan's Parthian wars" . . "Roman Empire" . . "Trajan's Parthian campaign" . "* Roman failure to maintain control of Mesopotamia." . "his Parthian expedition" . "launched a war" . . . "Trajan's final war" . "war against the Parthians" . . . . . . "Parthia" . "invaded the Parthian empire" . . . "Trajan's campaign against the Parthian empire" . . . "Byzantine Empire" . . "Stalemate" . "campaign of Trajan against the Parthians of 113\u2013117" . . . "Trajan's Parthian campaign" . "Battle of Ctesiphon (116)" . "campaign against the Parthians" . . . "Parthian Empire" . "Parthian campaign" .