▁the ▁Song ▁dynast y , ▁L iao ▁dynast y ▁and ▁Jin ▁dynast y ▁were ▁well - in formed ▁of ▁G ory e o ' s ▁use ▁of ▁imperial ▁titles , ▁all ▁three ▁Chinese ▁dynast ies ▁toler ated ▁such ▁practice . ▁In ▁ 1 2 7 0 , ▁G ory e o ▁became ▁a ▁semi - aut onom ous ▁region ▁of ▁the ▁Mong ol ▁Empire , ▁bringing ▁an ▁end ▁to ▁its ▁imperial ▁system . ▁Its ▁r ul ers ▁bore ▁the ▁title ▁king ▁and ▁were ▁prohib ited ▁from ▁having ▁temple ▁names ▁which ▁were ▁reserved ▁specifically ▁for ▁em per ors . ▁G ong min ▁of ▁G ory e o ▁declared ▁independence ▁from ▁the ▁Y uan ▁dynast y ▁in ▁ 1 3 5 6 . ▁ ▁In ▁ 1 3 9 2 , ▁T ae jo ▁of ▁Jose on ▁over th rew ▁G ory e o ▁and ▁established ▁a ▁new ▁dynast y ▁on ▁the ▁Korean ▁Pen ins ula . ▁He ▁was ▁best owed ▁the ▁title ▁King ▁of ▁Jose on ▁( 朝 <0xE9> <0xAE> <0xAE> 國 王 ) ▁by ▁the ▁Hong w u ▁Emperor ▁of ▁the ▁M ing ▁dynast y . ▁Both ▁dom est ically ▁and ▁extern ally , ▁r ul ers ▁of ▁Jose on ▁held ▁the ▁title ▁of ▁king , ▁unlike ▁G ory e o ' s ▁domestic ▁use ▁of ▁imperial ▁title . ▁ ▁Vietnam ▁ ▁In ▁ 5 4 4 , ▁L ý ▁B ô n ▁established ▁the ▁state ▁of ▁V ạ n ▁X u ân ▁and ▁proc laimed ▁himself ▁the ▁Emperor ▁of ▁Nam ▁Vi ệ