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Rh Sapor, had triumphed (as we have already seen) over the house of Arsaces. Of the many princes of that ancient race, Chosroes, king of Armenia, had alone preserved both his life and his independence. He defended himself by the natural strength of his country; by the perpetual resort of fugitives and malcontents; by the alliance of the Romans; and, above all, by his own courage. Invincible in arms, during a thirty years' war, he was assassinated by the emissaries of Sapor, king of Persia. The patriotic satraps of Armenia, who asserted the freedom and dignity of the crown, implored the protection of Rome in favour of Tiridates, the lawful heir. But the son of Chosroes was an infant, the allies were at a distance, and the Persian monarch advanced towards the frontier at the head of an irresistible force. Young Tiridates, the future hope of his country, was saved by the fidelity of a servant, and Armenia continued above twenty-seven years a reluctant province of the great monarchy of Persia. Elated with this easy conquest, and presuming on the distresses or the degeneracy of the Romans, Sapor obliged the strong garrisons of Carrhæ and Nisibis to surrender, and spread devastation and terror on either side of the Euphrates.

The loss of an important frontier, the ruin of a faithful and natural ally, and the rapid success of Sapor's ambition, affected Rome with a deep sense of the insult as well as of the danger. Valerian flattered himself that the vigilance of his lieutenants would sufficiently provide for the safety of the Rhine and of the Danube; but he resolved, notwithstanding his advanced age, to march in person to the defence of the Euphrates. During his progress through Asia Minor, the naval enterprises of the Goths were suspended, and the afflicted province enjoyed a transient and fallacious calm. He passed the Euphrates, encountered the Persian monarch near the walls of Edessa, was vanquished, and taken prisoner by Sapor. The particulars of that great event are darkly and imperfectly represented; yet, by the glimmering light which is afforded us, we may discover a long series of imprudence, of error, and of deserved misfortunes on the side of the Roman emperor. He reposed an implicit confidence in Macrianus, his Prætorian præfect. That worthless