The possession of Armenia was the point still in dispute. Vologeses saw with indignation the crown, which he had settled on his brother Tiridates, withheld by force, and, to let him receive it as the gift of a foreign power, was a degree of humiliation to which his pride 'could not submit. On the other hand, to recover the conquest formerly made by Lucullus and Pompey, was in Corbulo's judgment worthy of the Roman name. The Armenians balanced between the powers at war, and in their turn invited each. Their natural bias inclined them to the Parthians.
Urte haren hasieran, Armeniako nagusitzarako partoen eta erromatarren arteko gerra, artean bigun samar irauna, gogortu egiten da, Vologesesek ez baitzuen jasaten anaia Tiridates berak emandako erreinu bat gabe gera zedin, edo potentzia arrotz baten oparitzat eduki zezan, eta, aldi berean, Korbulonek pentsatzen baitzuen erromatar herriaren handitasunari zegokiona zela Luziok eta Ponpeiok behinola eginiko konkistak berreskuratzea.