▁king ▁Ant io chus ▁IV ▁E pi phan es ▁who ▁was ▁trying ▁to ▁reg ain ▁the ▁B act rian ▁territory . ▁Justin ▁explains ▁that ▁E uc rat ides ▁acc eded ▁to ▁the ▁throne ▁at ▁about ▁the ▁same ▁time ▁as ▁M ith rid ates , ▁whose ▁rule ▁is ▁accur ately ▁known ▁to ▁have ▁started ▁in ▁ 1 7 1 ▁BC , ▁thereby ▁giving ▁an ▁approximate ▁date ▁for ▁the ▁acc ession ▁of ▁E uc rat ides : ▁ ▁" Ar ound ▁the ▁same ▁time , ▁two ▁great ▁men ▁started ▁to ▁rule : ▁M ith rid ates ▁among ▁the ▁Par th ians , ▁and ▁E uc rat ides ▁among ▁the ▁B act ri ans " ▁Justin ▁X LI , 6 ▁ ▁Some ▁of ▁the ▁co ins ▁of ▁E uc rat ides ▁probably ▁represent ▁his ▁parents , ▁where ▁his ▁father ▁is ▁named ▁H eli oc les , ▁and ▁his ▁mother , ▁who ▁is ▁thought ▁to ▁be ▁La od ice , ▁is ▁we aring ▁a ▁royal ▁dia dem . ▁La od ice ▁may ▁have ▁been ▁a ▁member ▁of ▁the ▁Sele uc id ▁imperial ▁house . ▁ ▁Having ▁become ▁master ▁of ▁B act ria , ▁E uc rat ides ▁also ▁conquer ed ▁the ▁western ▁parts ▁of ▁the ▁Ind o - G reek ▁kingdom . ▁According ▁to ▁the ▁single ▁remaining ▁source , ▁Roman ▁historian ▁Justin , ▁E uc rat ides ▁defeated ▁Dem et ri us ▁of ▁India , ▁but ▁the ▁identity ▁of ▁this ▁king ▁is ▁uncertain : ▁he ▁could ▁be ▁either ▁Dem et ri us ▁I , ▁or ▁Dem et