Such were the terms upon which the Emperor Gallienus purchased a brief respite from his haughty enemies. For the moment, however, he _did_ enjoy security. Far otherwise was the destiny of his unhappy father. Sapor now ruled in Persia; the throne of Armenia had vainly striven to maintain its independency against his armies, and the daggers of his hired assassins. This revolution, which so much enfeebled the Roman means of war, exactly in that proportion increased the necessity for it. War, and that instantly, seemed to offer the only chance for maintaining the Roman name or existence in Asia, Carrhæ and Nisibis, the two potent fortresses in Mesopotamia, had fallen; and the Persian arms were now triumphant on both banks of the Euphrates. Valerian was not of a character to look with indifference upon such a scene, terminated by such a prospect; prudence and temerity, fear and confidence, all spoke a common language in this great emergency; and Valerian marched towards the Euphrates with a fixed purpose of driving the enemy beyond that river. By whose mismanagement the records of history do not enable us to say, some think of Macrianus, the prætorian prefect, some of Valerian himself, but doubtless by the treachery of guides co-operating with errors in the general, the Roman army was entangled in marshy grounds; partial actions followed, and skirmishes of cavalry, in which the Romans became direfully aware of their situation; retreat was cut off, to advance was impossible; and to fight was now found to be without hope. In these circumstances they offered to capitulate. But the haughty Sapor would hear of nothing but unconditional surrender; and to that course the unhappy emperor submitted. Various traditions [Footnote: Some of these traditions have been preserved, which represent Sapor as using his imperial captive for his stepping-stone, or _anabathrum_, in mounting his horse. Others go farther, and pretend that Sapor actually flayed his unhappy prisoner whilst yet alive. The temptation to these stories was perhaps found in the craving for the marvellous, and in the desire to make the contrast more striking between the two extremes in Valerian's life.] have been preserved by history concerning the fate of Valerian: all agree that he died in misery and captivity; but some have circumstantiated this general statement by features of excessive misery and degradation, which possibly were added afterwards by scenical romancers, in order to heighten the interest of the tale, or by ethical writers, in order to point and strengthen the moral. Gallienus now ruled alone, except as regarded the restless efforts of insurgents, thirty of whom are said to have arisen in his single reign. This, however, is probably an exaggeration. Nineteen such rebels are mentioned by name; of whom the chief were Calpurnius Piso, a Roman senator; Tetricus, a man of rank who claimed a descent from Pompey, Crassus, and even from