Tiranus was still living; and Sapor, we are told, offered to replace him upon the Armenian throne; but, as he had been blinded by his captors, and as Oriental notions did not allow a person thus mutilated to exercise royal power, Tiranus declined the offer made him, and suggested the substitution of his son, Arsaces, who was, like himself, a prisoner in Persia.

Sapor readily consented; and the young prince, released from captivity, returned to his country, and was installed as king by the Persians, with the good-will of the natives, who were satisfied so long as they could feel that they had at their head a monarch of the ancient stock.

The arrangement, of course, placed Armenia on the Persian side, and gave Sapor for many years a powerful ally in his struggle with Rome.
Thus Sapor had, by the, year A.D.341, made a very considerable gain.

He had placed a friendly sovereign on the Armenian throne, had bound him to his cause by oaths, and had thereby established his influence, not only over Armenia itself, but over the whole tract which lay between Armenia and the Caucasus.

But he was far from content with these successes.