Bahram retaliated by open rebellion. His army took his part. He very likely knew how disaffected the nobles were, and could count upon malcontents among the rest of the troops. The army in Mesopotamia, which had retreated to Nisibis after being defeated by the Romans and dreaded the vengeance of the king, mutinied and joined Bahram, though without resigning its independence. Bahram had advanced as far as the great Zab (not far from the Mosul of to-day) on his way to the capital, when he was confronted by a royal army. But this army likewise rebelled, not, indeed, in Bahram’s favour, but in favour of Chosroes, the king’s son. Some of these troops reached Ctesiphon soon after, whither Hormuzd had hurried from Media on receipt of the fatal tidings. The city was given over to tumult. Bindoe, whose sister was Chosroes’ mother, was imprisoned there (a fate most liable to befall an oriental noble); his brother Bistam (Vistahm) liberated him by force, and the nobles proceeded to depose Hormuzd and proclaim Chosroes king (summer of 590). He was on bad terms with his father, and the movement certainly did not come upon him as a surprise. How far he was implicated in the assassination of Hormuzd, which soon followed, we cannot tell with any degree of certainty; most likely he let that happen which he could not well prevent. Chosroes II, surnamed _Parvez_, “the victorious,” tried in vain to win Bahram over to his side. The latter himself wished to reign either in the name of a prince who was not of age, or preferably in his own. Chosroes marched against him, but his army was not loyal. The famous general commanded more respect than the faint-hearted king, whose troops deserted him after the first serious engagement. Chosroes, with his family and a few faithful followers, fled into Syria, to the Romans. When he had reached the frontier city of Circesium, he wrote to implore the aid of the emperor Maurice (who had been on the throne since the 14th of August, 582). The latter was not adroit enough to take advantage of this extraordinarily favourable situation for the benefit of his empire, for he undertook to restore Chosroes without stipulating for a fair equivalent. A man of mean origin himself, he probably felt flattered by the mere fact of being called upon to reinstate a legitimate king of ancient lineage and being able to declare himself “father” of such a one.