Armenian historians speak of a Chosroes I, the Great, who rules about this time, but the Romans do not mention him. Sanatruces seems to have been followed by =Vologases=, his son, and he in turn by his son =Tiridates II=, who escapes from the Romans to Vologases V of Parthia, about 227. His successor is =Arsaces II=, brother of Artabanus IV of Parthia. He wars against Ardashir, the Sassanid. 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. 419 Death of Sapor. Interregnum until 422 when =Artasires=, son of Bahram Sapor, is appointed king by Bahram V. 429 The Armenian nobles apply to Bahram to remove Artasires. The Persian king decides to make Armenia a province, and deposes Artasires. Henceforth the province is known as Pers-Armenia. From 429 to 632 Armenia is ruled by Persian governors, who are remarkable chiefly for their cruel attempts to subvert Christianity. 632 Heraclius restores Armenia to the Roman Empire, but in 636 it passes under Mohammedan rule. 885 The caliph Mutamid crowns =Ashod I=, one of the Bagratid family, king of Armenia. He rules in central and northern Armenia, and founds a dynasty that lasts until the assassination of =Kagig II=, in 1079, when the kingdom is incorporated with the Byzantine Empire.