The novelty of the work, as far as the author can assess it, lies, first of all, in the fact that for the first time an attempt was made to collect and investigate the maximum amount of information scattered in multilingual sources (Ancient Armenian, Parthian, Middle Persian, Bactrian, Sogdian, New Persian, Aramaic, Hebrew, Syriac, Greek, Latin and Arabic), as well as introduce into scientific circulation new Iranian (mainly Sasanian period) sources concerning the history of Armenia of the specified period (gems and bulls, coins, etc.).