▁he ▁revol ted ▁and ▁swe pt ▁back ▁to ▁Ga eg ye ong ▁and ▁initi ated ▁a ▁coup ▁d ' état , ▁over throw ing ▁King ▁U ▁in ▁favor ▁of ▁his ▁son , ▁Ch ang ▁of ▁G ory e o ▁( 1 3 8 8 ). ▁He ▁later ▁killed ▁King ▁U ▁and ▁his ▁son ▁after ▁a ▁failed ▁rest oration ▁and ▁for ci b ly ▁placed ▁a ▁royal ▁named ▁Y i ▁on ▁the ▁throne ▁( he ▁became ▁G ong y ang ▁of ▁G ory e o ). ▁In ▁ 1 3 9 2 , ▁Y i ▁elimin ated ▁Je ong ▁Mong - ju , ▁highly ▁respect ed ▁leader ▁of ▁a ▁group ▁loyal ▁to ▁G ory e o ▁dynast y , ▁and ▁d eth ron ed ▁King ▁G ong y ang , ▁ex iling ▁him ▁to ▁W on ju , ▁and ▁before ▁he ▁asc ended ▁the ▁throne . ▁The ▁G ory e o ▁D ynast y ▁had ▁come ▁to ▁an ▁end ▁after ▁almost ▁ 5 0 0 ▁years ▁of ▁rule . ▁ ▁In ▁the ▁beginning ▁of ▁his ▁reign , ▁Y i ▁Se ong gy e , ▁now ▁r uler ▁of ▁Korea , ▁intended ▁to ▁continue ▁use ▁of ▁the ▁name ▁G ory e o ▁for ▁the ▁country ▁he ▁ruled ▁and ▁simply ▁change ▁the ▁royal ▁line ▁of ▁descent ▁to ▁his ▁own , ▁thus ▁maintain ing ▁the ▁fa ç ade ▁of ▁continu ing ▁the ▁ 5 0 0 - year - old ▁G ory e o ▁tradition . ▁However , ▁after ▁numerous ▁thre ats ▁of ▁mut iny ▁from ▁the