<0xE1> <0xBB> <0x89> ▁( G iao ▁Ch <0xE1> <0xBB> <0x89> ▁qu ậ n ), ▁by ▁his ▁prede cess ors . ▁There after ▁the ▁Song ▁D ynast y ▁formally ▁recognized ▁the ▁r uler ▁of ▁ Đ ạ i ▁Vi ệ t ▁as ▁a ▁king ▁( Qu ố c ▁v ư ơ ng ), ▁instead ▁of ▁a ▁district ▁governor ▁( Qu ậ n ▁v ư ơ ng ). ▁V ân ▁ Đ ồ n ▁The ▁principal ▁port ▁of ▁trade ▁between ▁ Đ ạ i ▁Vi ệ t ▁and ▁China ▁was ▁also ▁opened ▁in ▁ 1 1 4 9 ▁by ▁the ▁order ▁of ▁L ý ▁An h ▁T ô ng . ▁ ▁L ý ▁An h ▁T ô ng ▁died ▁in ▁the ▁sevent h ▁month ▁of ▁ 1 1 7 5 ▁at ▁the ▁age ▁of ▁ 3 9 . ▁Before ▁his ▁death , ▁the ▁em peror ▁entr usted ▁the ▁reg ency ▁of ▁his ▁ 3 - year - old ▁crown ▁prince ▁T ô ▁Hi ế n ▁Th àn h , ▁despite ▁efforts ▁from ▁the ▁em press ▁to ▁supply ▁another ▁prince ▁for ▁the ▁throne . ▁This ▁final ▁act ▁by ▁L ý ▁An h ▁T ô ng ▁was ▁appreciated ▁by ▁the ▁historian ▁Ng ô ▁S ĩ ▁Li ên ▁as ▁a ▁right ▁decision ▁to ▁maintain ▁the ▁order ▁of ▁succession ▁for ▁the ▁royal ▁family ▁and ▁royal ▁court . ▁ ▁Family ▁The ▁first ▁son ▁of ▁L ý ▁An h ▁T ô ng , ▁the ▁Prince ▁Hi ể n ▁Tr ung ▁( Hi ể n ▁Tr ung ▁v ư ơ ng )