▁his ▁brothers , ▁Ye on ▁Nam geon ▁and ▁Ye on ▁N ams an , ▁in ▁charge ▁of ▁P ye ong y ang ▁before ▁he ▁left . ▁Nam geon ▁and ▁N ams an ▁took ▁advantage ▁of ▁their ▁brother ' s ▁absence ▁and ▁took ▁control ▁of ▁P ye ong y ang ▁and ▁the ▁Royal ▁Cour ts . ▁They ▁f als ely ▁accused ▁N ams a eng ▁of ▁being ▁a ▁tra itor , ▁and ▁forced ▁the ▁King ▁Bo j ang ▁to ▁order ▁N ams a eng ' s ▁arrest . ▁With ▁now here ▁else ▁to ▁go , ▁N ams a eng ▁fled ▁to ▁Tang ▁China ▁at ▁the ▁ur ge ▁of ▁his ▁son , ▁who ▁had ▁escaped ▁death ▁at ▁the ▁hands ▁of ▁his ▁un cles . ▁N ams a eng ▁fled ▁to ▁the ▁Tang , ▁and ▁received ▁a ▁high ▁position ▁in ▁the ▁Tang ▁military . ▁ ▁Fall ▁of ▁G og ury e o ▁and ▁death ▁ ▁From ▁there ▁he ▁helped ▁lead ▁a ▁Tang - sp ons ored ▁military ▁campaign ▁into ▁G og ury e o ▁with ▁hopes ▁of ▁reg aining ▁power . ▁This ▁campaign ▁ultimately ▁destroyed ▁G og ury e o ▁in ▁ 6 6 8 . ▁He ▁died ▁in ▁the ▁domains ▁of ▁the ▁Tang - est ab lished ▁Prote ctor ate ▁General ▁to ▁Pac ify ▁the ▁East , ▁or ▁And ong ▁Du h uf u ▁( 安 東 都 <0xE8> <0xAD> <0xB7> 府 ), ▁the ▁Chinese ▁administration ▁established ▁in ▁Py ong y ang ▁following ▁the ▁fall ▁of ▁G og ury e o ▁in ▁ 6 6