His father Anak, head of the Parthian clan of Suren, was bribed about the time of his birth (c. 257) by the Sassanid king of Persia to assassinate the Armenian king, Chosroes, who was of the old Arsacid dynasty, and father of Tiridates or Trdat, first Christian king of Armenia.
Gregory persuaded Tiridates to destroy the last relics of the old paganism, and carried out in the religious sphere his sovereign's policy of detaching Great Armenia from the Sassanid realm and allying it with the GraecoRoman empire and civilization.
During the last years of the Sassanid dynasty the work was resumed, the former collection being revised and greatly added to by the Dihkan Danishwer, assisted by several learned mobeds.
The Sassanid king, Bahram V., fought several campaigns with them and succeeded in keeping them at bay, but they defeated and killed Peroz (Firuz), A.D.
Chosroes I., " the Blessed " (Anushirvan), 531-579, the favourite son and successor of Kavadh I., and the most famous of the Sassanid kings.