According to the version of the history attributed to
Agathangelos accepted in the Armenian literary tradition, Anak was a noble of Parthian origin who was related to the king of Armenia. The later history of
Movses Khorenatsi adds that Anak was a member of the Parthian noble house of
Suren. During the third-century wars between Arsacid Armenia and Sasanian Iran, Anak was recruited by the Sasanian king (whom Agathangelos calls
Artashir) to assassinate King Khosrov of Armenia (probably
Khosrov II), promising to return Anak his domain as reward. Anak went to Armenia and murdered Khosrov after gaining his confidence, after which he himself was killed by angry Armenian nobles along with his whole family. Agathangelos describes the circumstances of Khosrov's murder as follows: Anak and his brother met with the king in
Vagharshapat as he was preparing to campaign against the Persians and killed him with their swords. They attempted to flee on horseback, but were chased down by the Armenian princes who threw them from the Taperakan bridge (over the
Araxes River, near
Artaxata) to their deaths. One of Anak's sons, the future
Gregory the Illuminator, was rescued by his nurse and taken to Roman territory. Khosrov's son
Trdat (Tiridates) was also saved and taken to Rome. After Khosrov's death, the Persians conquered Armenia. Later, Trdat returned to reclaim the Armenian throne with Roman help. Gregory, who was raised a Christian in
Caesarea of Cappadocia, also returned to Armenia as an adult and eventually converted Trdat and his kingdom to Christianity. This story is repeated in all the other Armenian histories except that of
Elishe, which attributes Khosrov's murder to his unnamed brothers.
Family Anak's exact relation to Khosrov is not stated in the main Armenian version of Agathangelos, but a
Karshuni recension of Agathangelos's history claims that Anak was Khosrov's brother. Anak's wife and the mother of Gregory of Illuminator is called () in the history attributed to
Zenob Glak. Agathangelos mentions two sons of Anak who survive the extermination of his house: one, Gregory, and another who is taken to Persia, although no other information is given about the latter. Khorenatsi, on the other hand, writes that only one son of Anak (i.e., Gregory) was saved. Zenob Glak refers to Gregory's brother as Suren. == Historiography ==