After the demise of Commodus, Roman emperor, in 192 A.D, the rivalry between his generals, Pescennius Niger and Septimius Severus, arose; and Vologases V, Parthian emperor, decided to support Niger against Severus. According to Herodian's History, the Parthian emperor only managed to request his local following governors to send troops to aid Niger; as Vologases V did not possess a great army. Eventually in 194, Severus won the quest for power in Rome; he invaded Western Mesopotamia in order to retake the lost regions; the accurate details of the invasion is not known, but Osroene and Nusaybin were retaken anyway. Then Severus returned to Rome due to Clodius Albinus's rebellion; during Severus's return from Mesopotamia, the status of the Parthian Empire was very disrupted. In 197, Severus initiated hostilities with the Parthians. Meanwhile, Vologases suppressed a rebellion in east of the Empire; Narses, governor of Adiabene (a region to the west of current Lake Urmia), disobeyed to accompany Vologases to invade the East to suppress the rebellion; the noncompliance and also Narses's friendly relations with Rome caused Vologases' attack to Adiabene and destroying multiple cities of it and also killing Narses.