▁late ▁( 3 rd ▁century ) ▁opinion ▁is ▁" no ▁doubt ▁slightly ▁ex agger ated ," ▁and ▁is ▁in ▁any ▁case ▁of ▁question able ▁ver acity ▁given ▁the ▁ambigu ity ▁of ▁names . ▁ ▁R ise ▁to ▁prom in ence ▁ ▁In ▁ 2 4 7 ▁B CE , ▁And rag or as , ▁the ▁Sele uc id ▁governor ▁( s at rap ) ▁of ▁Par th ia ▁(" rough ly ▁western ▁Kh uras an ") ▁proc laimed ▁independence ▁from ▁the ▁Sele uc ids , ▁when — follow ing ▁the ▁death ▁of ▁Ant io chus ▁II — P to le my ▁III ▁seized ▁control ▁of ▁the ▁Sele uc id ▁capital ▁at ▁Ant io ch , ▁and ▁" so ▁left ▁the ▁future ▁of ▁the ▁Sele uc id ▁dynast y ▁for ▁a ▁moment ▁in ▁question ." ▁ ▁Meanwhile , ▁" a ▁man ▁called ▁Ar s aces , ▁of ▁S cy th ian ▁or ▁B act rian ▁origin , ▁[ was ] ▁elected ▁leader ▁of ▁the ▁Par ni ▁tribes ." ▁Following ▁the ▁se cess ion ▁of ▁Par th ia ▁from ▁the ▁Sele uc id ▁Empire ▁and ▁the ▁result ant ▁loss ▁of ▁Sele uc id ▁military ▁support , ▁And rag or as ▁had ▁difficulty ▁in ▁maintain ing ▁his ▁borders , ▁and ▁about ▁ 2 3 8 ▁B CE — under ▁the ▁command ▁of ▁" Ar s aces ▁and ▁his ▁brother ▁Tir id ates " — the ▁Par ni ▁inv aded ▁Par th ia ▁and ▁seized ▁control ▁of ▁Ast ab ene ▁( A st awa ), ▁the ▁northern