At the same time that Isdigerd allowed this violent persecution of the Christians in his own kingdom of Persia, he also sanctioned an attempt to extirpate Christianity in the dependent country of Armenia. Varahran-Sapor, the successor of Chosroes, had ruled the territory quietly and peaceably for twenty-one years. He died A.D. 413, leaving behind him a single son, Artases, who was at his father's death aged no more than ten years. Under these circumstances, Isaac, the Metropolitan of Armenia, proceeded to the court of Ctesiphon, and petitioned Isdigerd to replace on the Armenian throne the prince who had been deposed twenty-one years earlier, and who was still a prisoner on parole in the "Castle of Oblivion"--viz. Chosroes. Isdigerd acceded to the request; and Chosroes was released from confinement and restored to the throne from which he had been expelled by Varahran IV. in A.D. 391. He, however, survived his elevation only a year. Upon his decease, A.D. 413, Isdigerd selected for the viceroyship, not an Arsacid, not even an Armenian, but his own son, Sapor, whom he forced upon the reluctant provincials, compelling them to acknowledge him as monarch (A.D. 413-414). Sapor was instructed to ingratiate himself with the Armenian nobles, by inviting them to visit him, by feasting them, making them presents, holding friendly converse with them, hunting with them; and was bidden to use such influence as he might obtain to convert the chiefs from Christianity to Zoroastrianism. The young prince appears to have done his best; but the Armenians were obstinate, resisted his blandishments, and remained Christians in spite of all his efforts. He reigned from A.D. 414 to 418, at the end of which time, learning that his father had fallen into ill health, he quitted Armenia and returned to the Persian court, in order to press his claims to the succession. Isdigerd died soon afterwards (A.D. 419 or 420); and Sapor made an attempt to seize the throne; but there was another pretender whose partisans had more strength, and the viceroy of Armenia was treacherously assassinated in the palace of his father. Armenia remained for three years in a state of anarchy; and it was not till Varahran V. had been for some time established upon the Persian throne that Artases was made viceroy, under the name of Artasiris or Artaxerxes.