258 Sapor I of Persia puts Artavasdes III on the Armenian throne.
285 About this date Tiridates III, the rightful heir of the throne and a Christian, is established by Diocletian. Narseh expels him after a few years, and this brings on a war between Persia and Rome. Tiridates is restored.
341 Probably at this date Arsaces III ascends the throne, after his father, Tiridates III, has been imprisoned by Sapor II of Persia. He assists Sapor in his wars with Rome, and then allies himself with Rome.
363 Arsaces deserts the Romans in the siege of Ctesiphon. He is seized by Sapor, and imprisoned. Sapor puts Aspacures on the throne, but Para, son of Arsaces, is also acknowledged king, with the help of the Romans.
374 or 377 Valens, dissatisfied with Para, has him put to death. Para’s nephew, Arsaces IV, succeeds, together with a brother, Valarsaces II, who dies soon. Arsaces proves so weak a ruler that Theodosius the Great and Sapor III decide to divide the kingdom.
387 or 390 Division of Armenia between Rome and Persia. Arsaces continues to reign in the Roman dominions. Sapor gives his (the eastern) portion to a Persian noble, Khosrau, or Chosroes.
389 Death of Arsaces IV. Theodosius confers his portion upon his general, Casavon, who plots with Chosroes to bring all Armenia under Roman dominion. Bahram IV of Persia seizes Chosroes and
392 puts the latter’s brother, Bahram Sapor, on the vassal throne of eastern Armenia.
414 Chosroes restored by Yezdegerd I.
415 Death of Chosroes. Yezdegerd’s son, Sapor, becomes king.