Chosroes was received with all honor by Probus, the governor of Circesium, who the next day communicated intelligence of what had happened to Comentiolus, Prefect of the East, then resident at Hierapolis. At the same time he sent to Comentiolus a letter which Chosroes had addressed to Maurice, imploring his aid against his enemies. Comentiolus approved what had been done, despatched a courier to bear the royal missive to Constantinople, and shortly afterwards, by the direction of the court, invited the illustrious refugee to remove to Hierapolis, and there take up his abode, till his cause should be determined by the emperor. Meanwhile, at Constantinople, after the letter of Chosroes had been read, a serious debate arose as to what was fittest to be done. While some urged with much show of reason that it was for the interest of the empire that the civil war should be prolonged, that Persia should be allowed to waste her strength and exhaust her resources in the contest, at the end of which it would be easy to conquer her, there were others whose views were less selfish or more far-sighted. The prospect of uniting the East and West into a single monarchy, which had been brought to the test of experiment by Alexander and had failed, did not present itself in a very tempting light to these minds. They doubted the ability of the declining empire to sway at once the sceptre of Europe and of Asia. They feared that if the appeal of Chosroes were rejected, the East would simply fall into anarchy, and the way would perhaps be prepared for some new power to rise up, more formidable than the kingdom of the Sassanidae. The inclination of Maurice, who liked to think himself magnanimous, coincided with the views of these persons: their counsels were accepted; and the reply was made to Chosroes that the Roman emperor accepted him as his guest and son, undertook his quarrel, and would aid him with all the forces of the empire to recover his throne. At the same time Maurice sent him some magnificent presents, and releasing the Persian prisoners in confinement at Constantinople, bade them accompany the envoys of Chosroes and resume the service of their master. Soon afterwards more substantial tokens of the Imperial friendship made their appearance. An army of 70,000 men arrived under Narses; and a subsidy was advanced by the Imperial treasury, amounting (according to one writer) to about two millions sterling. But this valuable support to his cause was no free gift of a generous friend; on the contrary, it had to be purchased by great sacrifices. Chosroes had perhaps at first hoped that aid would be given him gratuitously, and had even regarded the cession of a single city as one that he might avoid making. But he learnt by degrees that nothing was to be got from Rome without paying for it; and it was only by ceding Persarmenia and Eastern Mesopotamia, with its strong towns of Martyropolis and Daras, that he obtained the men and money that were requisite.