Armeno-Sasanian Wars of 363–371

In 359 AD, another Roman-Persian war began, which ended with the defeat of Rome.^[15][16] Julian, the Roman emperor at the time, was killed by a Sasanian kontophoroi cavalry spearmen.^[17] The next emperor, Jovian, did not continue the war and signed a treaty with Persia. According to this treaty, the 5 southern Armenian provinces, along with 15 fortresses and cities, were to pass under the rule of the Persians.^[18][19] This treaty signed by Rome was called "shameful" by the 4th-century Roman historian Ammianus. This treaty allowed the Persian "king of kings" (Shahanshah) Shapur II to freely implement his plans for Greater Armenia.^[20]

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Siege of Artogerassa, 368 AD

Main article: Siege of Artogerassa (368)

By carefully calculated flattery mingled with perjury Shapur, tricked King Arsaces; for after being invited to a banquet he was taken according to orders to a secret rear-door; there after his eyes had been gouged out, he was bound in silver chains, which among that people is regarded as a consolation, though an empty one, for the punishment of men of rank, and then he was banished to a fortress called Agabana, where after being tortured he was slain by the penal steel.^[21] After sending Pap to safety in Roman Cappadocia, Parandzem manned the watchtowers every night at Artogerassa in the Caucasus Mountains on the Aras River and brandished torches to show her resolve. Meanwhile, the siege of Artogerassa continued, and the Epic Histories inform us that Pap, in "the land of the Greeks," was in communication with his mother inside the fortress, whom he encouraged to await his rescue, Unfortunately for Parandzem, Valens was willing to intervene and reimpose Pap only in 369.^[22] The clash ended in 368 in epidemic and hunger that wiped out most of Queen Parandzem's army made up of 11,000 men and forced her surrender,^[23] taking over a thousand people and the Queen herself captive.^[24] After the siege Shapur ravages Armenia in retaliation of the ally with Rome, Shapur destroyed Artaxata, the Armenian capital, after that Shapur blockaded Artogerassa with the whole weight of his forces and after some battles of varying result and the exhaustion of the defenders, forced his way into the city and set it on fire, dragging out and carrying off the wife and the treasures of Arsaces.^[23][25] Shapur II wanting to humiliate Armenia and the Roman Empire, had Parandzem given to his soldiers whom they brutally raped until she died.^[8][26]

Battle in Bagrevand, 371 AD

Main article: Battle of Bagavan

The combined Armenian-Roman army, amounting up to 90,000 men,^[27] met the invading Sassanid force near Bagavan.^[28] According to Ammianus Marcellinus, the Romans initially withdrew to avoid combat, but were eventually forced to respond to the attacks of the Persian cavalry and won a decisive victory in the subsequent battle, inflicting heavy casualties on the Persians.^[29][28] Faustus of Byzantium gives considerable credit for the victory to sparapet Mushegh I Mamikonian.^[28] Faustus also tells of how Urnayr of Albania asked Shapuh to let his contingent face the Armenian force, and how Mushegh engaged in single combat with Urnayr and wounded the Albanian king, but allowed him to escape with his life.^[4][27] This may indicate that the battle took place in a similar fashion as other battles where the Romans and their allies faced the Persians and their allies, with the Romans facing the Persians and the allies fighting each other.^[30] According to Faustus, King Pap did not take part in the battle and observed from Mount Npat together with Patriarch Nerses at the request of the Roman generals.^[28][27]

Ammianus (29.1.4) writes that several more engagements were fought after the Armeno-Roman victory at Bagavan, with varying results. Faustus tells of another major Battle at Ganzak in Azerbaijan, where the Armenians and Romans defeated the Persians again, this time with Shapur leading in person, who sustained a light wound caused by fighting.^[31] After these battles, Shapur sent emissaries and a truce was agreed. Shapur then returned to Ctesiphon and Valens to Antioch, with Armenia effectively under Roman suzerainty.^[28] The truce would last for seven years.^[32] As a result of these victories, Mushegh is said to have reconquered many lost Armenian territories and forced the nobles who had revolted against the Arsacid monarchy to submit to the authority of Pap.^[28][33]