But Varahran was not willing to cede his rights.

Having persuaded the Arabs to embrace his cause, he marched upon Ctesiphon at the head of a large force, and by some means or other, most probably by the terror of his arms, prevailed upon Chosroes, the nobles, and the Magi, to submit to him.

The people readily acquiesced in the change of masters; Chosroes descended into a private station, and Varahran, son of Isdigerd, became king.
Varahran seems to have ascended the throne in A.D.420.

He at once threw himself into the hands of the priestly party, and, resuming the persecution of the Christians which his father had carried on during his later years, showed himself, to one moiety of his subjects at any rate, as bloody and cruel as the late monarch.

Tortures of various descriptions were employed; and so grievous was the pressure put upon the followers of Christ that in a short time large numbers of the persecuted sect quitted the country, and placed themselves under the protection of the Romans.