"Osroes, moreover, desired peace at least as much as I"

Osroes I of Parthia (reigned 109-129 AD) was a prince of Graeco-Iranian ancestry. His invasion of Armenia had prompted the war with Trajan. Following Trajan's death, however, Osroes displaced Parthamaspates, the vassal installed by Trajan, to reclame the Persian throne. Hadrian acknowledged this as a fait accompli, and returned his daughter, taken as a hostage by Trajan.