

Roman influence was secured through a series of Roman-sponsored kings until 37 AD, when a Parthian-supported candidate, Orodes, assumed the throne. In 20 BC, Augustus succeeded in establishing a Roman protectorate over the country, when Tigranes III was enthroned as king of Armenia. The largest and most important of these was the Kingdom of Armenia. 5 Corbulo's return and peace settlementĮver since the expanding Roman Republic and the Parthian Empire had come into contact in the mid-1st century BC, there had been friction between the two great powers of the Near East over the control of the various states lying between them.3 Outbreak of the war - The Roman offensive.2 Diplomatic maneuvers and preparations.This conflict was the first direct confrontation between Parthia and the Romans since Crassus' disastrous expedition and Mark Antony's campaigns a century earlier, and would be the first of a long series of wars between Rome and Iranian powers over Armenia (see Roman–Persian Wars). The conflict ended soon after, in an effective stalemate and a formal compromise: a Parthian prince of the Arsacid line would henceforth sit on the Armenian throne, but his nomination had to be approved by the Roman emperor.

As soon as these had been dealt with, however, the Parthians turned their attention to Armenia, and after a couple of years of inconclusive campaigning, inflicted a heavy defeat on the Romans in the Battle of Rhandeia. The Romans were aided by the fact that the Parthian king Vologases was embroiled in the suppression of a series of revolts in his own country. They overcame the forces loyal to Tiridates, installed their own candidate, Tigranes VI, on the Armenian throne, and left the country. The war, which was the only major foreign campaign of his reign, began with rapid success for the Roman forces, led by the able general Gnaeus Domitius Corbulo. These events coincided with the accession of Nero to the imperial throne in Rome, and the young emperor decided to react vigorously. 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. 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, a vital buffer state between the two realms.
