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Rh fended it in person, escaped with precipitation; an hundred thousand captives and a rich booty rewarded the fatigues of the Roman soldiers. Notwithstanding these misfortunes, Ctesiphon succeeded to Babylon and to Seleucia as one of the great capitals of the East. In summer, the monarch of Persia enjoyed at Ecbatana the cool breezes of the mountains of Media; but the mildness of the climate engaged him to prefer Ctesiphon for his winter residence.

From these successful inroads the Romans derived no real or lasting benefit; nor did they attempt to preserve such distant conquests, separated from the provinces of the empire by a large tract of intermediate desert. The reduction of the kingdom of Osrhoene was an acquisition of less splendour indeed, but of a far more solid advantage. That little state occupied the northern and most fertile part of Mesopotamia, between the Euphrates and the Tigris. Edessa, its capital, was situated about twenty miles beyond the former of those rivers, and the inhabitants, since the time of Alexander, were a mixed race of Greeks, Arabs, Syrians, and Armenians. The feeble sovereigns of Osrhoene, placed on the dangerous verge of two contending empires, were attached from inclination to the Parthian cause; but the superior power of Rome exacted from them a reluctant homage, which is still attested by their medals. After the conclusion of the Parthian war under Marcus, it was judged prudent to secure some substantial pledges of their doubtful fidelity. Forts were constructed in several parts of the country, and a Roman garrison was fixed in the strong town of Nisibis. During the troubles that followed the death of Commodus, the princes of Osrhoene attempted to shake off the yoke; but the stern policy of Severus confirmed their dependence, and the perfidy of Caracalla completed the easy conquest. Abgarus, the last king of Edessa, was sent in chains to Rome, his dominions reduced into a province, and his