Herodian, History of the Empire From the Death of Marcus…
“ We brought the war against the Parthians to a conclusion, a critical struggle involving the safety of the whole Roman empire. In our courageous opposition to the Parthians we proved in no way inferior to them, and in signing a treaty of peace we made a loyal friend instead of a dangerous enemy of a great king, who had marched against us at the head of a formidable army. Under my rule all men shall live in peace, and senatorial rule shall replace the autocracy. ”
