Roman–Parthian War of 58–63

The Roman–Parthian War of 58–63 or the War of the Armenian Succession was fought between the Roman Empire and the Parthian Empire over control of Armenia, an important buffer state between the two realms. Armenia had been a Roman client state since the days of Emperor Augustus, but in 52/53, the Parthians succeeded in installing their own candidate, Tiridates, on the Armenian throne.

Source: Wikipedia — Roman–Parthian War of 58–63 (CC BY-SA 4.0)