by the Romans as king of Armenia in 335/336 but died in 337 without Khosrov III having been displaced. Tiran (Tigranes VII), 338–350, son of Khosrov III Arshak II, 350–368, son of Tiran Pap, 368–374, son of Arshak II Varazdat, 374–378, nephew of Pap (perhaps son of Pap's younger brother Tiridates) Arshak III, c. 378–387 and Vologases III, c. 378–386, sons of Pap The Sasanians appointed their own Armenian king (Khosrov IV) in 384, against the Roman-supported Arshak III, leading Armenia to becoming informally divided under the two kings. The division was made formal through an agreement between the Roman emperor Theodosius I and Sasanian king Shapur III in 387, which partitioned Armenia into a western (under Roman influence) and an eastern (under Sasanian influence) kingdom. Kings in western Armenia (387–389) Arshak III, 387–c. 389, former king of all of Armenia Upon the death of Arshak III in 389, Emperor Theodosius I chose to not appoint another king, ending the western kingdom. The territories formerly ruled by Arshak were incorporated into the Roman Empire as a province. Kings in eastern Armenia (384–428) Khosrov IV, 384–389, son of Varazdat? Vramshapuh, 389/401–417, son of Varazdat? Khosrov V, 417–418, possibly the same person as Khosrov IV Shapur, 418–422, son of the Sasanian king Yazdegerd I, later king of the Sasanian Empire as Shapur IV Artaxias IV, 422–428, son of Vramshapuh The Sasanian king Bahram V deposed the last eastern king, Artaxias IV, in 428 with the permission of the Armenian nobility and annexed his domains into the Sasanian Empire. Vassal lords and princes (428–884) Marzbāns in Sasanian Armenia (428–646) Following their deposition of the last Arsacid king Artaxias IV, the Sasanian Empire entrusted the rule of their Armenian territories to an official with the title marzbān, a title variously interpreted as governor-general or viceroy. The first marzbān, appointed by Bahram V, was the military officer Veh Mihr Shapur. The list of marzbān is not entirely contiguous due to both periods without an appointed marzbān and gaps in the historical record. It was relatively common for the office to be vacant since the Sasanians periodically tried to assert more direct control. Veh Mihr Shapur, marzbān 428–442, Sasanian military officer Vasak Siwni, marzbān c. 442–451, Armenian noble Sahak II Bagratuni, insurgent marzbān 482–483, Armenian noble Vahan I Mamikonian, autonomous marzbān 485–505/510, Armenian noble Vard Mamikonian, autonomus marzbān 505/501–509/514, Armenian noble Mjej I Gnuni, marzbān 518–548,