▁was ▁in ▁military ▁conflict ▁and ▁failed ▁diplom atic ▁treat ies ▁with ▁the ▁Roman ▁em per ors ▁J ov ian ▁and ▁Val ens . ▁ ▁Sh ap ur ▁II ▁after ▁successfully ▁capt uring ▁Ar s aces ▁II , ▁he ▁sent ▁his ▁army ▁to ▁in va de ▁Armen ia . ▁ ▁Def ender ▁of ▁Art og er assa ▁When ▁the ▁S ass an id ▁army ▁were ▁heading ▁to ▁in va de ▁Armen ia , ▁Ph ar ant zem ▁and ▁her ▁son , ▁Pap as ▁took ▁the ▁Armen ian ▁tre as ury ▁and ▁hid ▁themselves ▁in ▁the ▁for tr ess ▁of ▁Art og er assa , ▁where ▁the ▁for tr ess ▁was ▁def ended ▁by ▁a ▁troops ▁of ▁Az ats . ▁The ▁Armen ian ▁invasion ▁was ▁led ▁by ▁Cy laces ▁( also ▁known ▁as ▁Cy lax ▁Z ig ) ▁and ▁Art aban es ▁( also ▁known ▁as ▁Art ab nan ▁Kar en ), ▁two ▁Armen ians ▁who ▁defect ed ▁to ▁Sh ap ur ▁II . ▁Cy laces ▁and ▁Art aban es ▁were ▁also ▁supported ▁by ▁the ▁Armen ian ▁nobles ▁V ah an ▁Mam ikon ian ▁and ▁Mer uz han ▁Arts run i ▁who ▁also ▁defect ed ▁to ▁Sh ap ur ▁II . ▁Sh ap ur ▁II ▁wanted ▁to ▁suppress ▁Ar s ac id ▁rule ▁in ▁Armen ia ▁and ▁replace ▁the ▁dynast y ▁with ▁Pers ian ▁administr ators ▁and ▁traditional ▁Armen ian ▁arist ocrat ▁L ords ▁to ▁govern ▁over ▁Armen ia . ▁ ▁Ph ar ant zem ▁was ▁able ▁to ▁have ▁initi ate ▁negoti ations ▁with ▁Cy