▁bank ; ▁and ▁C tes i phon , ▁which ▁was ▁on ▁the ▁left ▁bank ▁and ▁was ▁the ▁Par th ian ▁capital . ▁After ▁capt uring ▁C tes i phon , ▁he ▁bur nt ▁the ▁palace ▁of ▁V olog ases ▁IV . ▁Despite ▁the ▁fact ▁that ▁Sele u cia ▁had ▁surrender ed ▁to ▁the ▁Rom ans , ▁he ▁destroyed ▁it ▁as ▁well , ▁just ifying ▁it ▁by ▁claim ing ▁that ▁the ▁local ▁population ▁had ▁broken ▁their ▁agreement . ▁▁ ▁Cass ius ' ▁leg ion ▁was ▁by ▁this ▁time ▁in ▁dire ▁need ▁of ▁supplies . ▁After ▁showing ▁the ▁first ▁signs ▁of ▁having ▁contract ed ▁the ▁pl ague , ▁Cass ius ▁march ed ▁back ▁to ▁Sy ria , ▁carrying ▁with ▁him ▁the ▁spo ils ▁taken ▁from ▁his ▁campaign . ▁He ▁sent ▁details ▁of ▁his ▁campaign ▁to ▁Rome , ▁for ▁which ▁he ▁was ▁reward ed ▁with ▁elev ation ▁to ▁the ▁Senate . ▁Much ▁of ▁his ▁success ▁was ▁cred ited ▁to ▁Emperor ▁Lu cius ▁Ver us , ▁who , ▁although ▁himself ▁an ▁excellent ▁commander , ▁was ▁noted ly ▁una f raid ▁of ▁deleg ating ▁military ▁tasks ▁to ▁more ▁compet ent ▁gener als . ▁ ▁In ▁May ▁of ▁ 1 6 6 AD , ▁Cass ius ▁was ▁made ▁su ffect ▁cons ul , ▁a ▁position ▁he ▁held ▁while ▁still ▁station ed ▁outside ▁of ▁Rome . ▁During ▁that ▁year , ▁Lu cius ▁Ver us ▁and ▁Cass ius ▁launched ▁a ▁new ▁campaign ▁against ▁the ▁Par th ians , ▁inv ading ▁across ▁the ▁northern ▁stretch ▁of ▁the ▁Tig ris ▁river , ▁into