The available books of Tacitus’ Annales constitute the most important source of information concerning the long war between Rome and the Great King for supremacy in Armenia. Leaving in the background the stereotypical way in which the Arsacids are often portrayed, his characterisation of the protagonists, both Roman and Parthian, reflects Tacitus’ opinions about Rome’ political past and present. The representations the Roman author provides of the various leaders, Corbulo, Paetus, Vologases and Tiridates, seem to marginalise the distinction between Roman and Parthians, in order to distinguish between those who are familiar with the rules of psychological warfare and experts in the tricks of the war game and those who are tragically not.