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 this 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 minister rendered his master formidable only to the oppressed subjects, and contemptible to the enemies of Rome. By his weak or wicked counsels, the Imperial army was betrayed into a situation where valor and military skill were equally unavailing. The vigorous attempt of the Romans to cut their way through the Persian host was repulsed with great slaughter; and Sapor, who encompassed the camp with superior numbers, patiently waited till the increasing rage of famine and pestilence had insured his victory. The licentious murmurs of the legions soon accused Valerian as the cause of their calamities; their seditious clamors demanded an instant capitulation. An immense sum of gold was offered to purchase the permission of a disgraceful retreat. But the Persian, conscious of his superiority, refused the money with disdain; and detaining the deputies, advanced in order of battle to the foot of the Roman rampart, and insisted on a personal conference with the emperor. Valerian was reduced to the necessity of intrusting his life and dignity to the faith of an enemy. The interview ended as it was natural to expect. The emperor was made a prisoner, and his astonished troops laid down their arms. In such a moment of triumph, the pride and policy of Sapor prompted him to fill the vacant throne with a successor entirely dependent on his pleasure. Cyriades, an obscure fugitive of Antioch, stained with every vice, was chosen to dishonor the Roman purple; and the will of the Persian victor could not fail of being ratified by the acclamations, however reluctant, of the captive army.