Rubuta ci gaba don wannan sakin layi - Bayan faduwar Silla, Taejo na Goryeo ya kafa babban birnin masarautarsa a Kaesŏng, yanzu arewacin yankin da ba shi da makamai. A lokacin mamayar Mongol na Koriya
a cikin karni na 12, wurin zama na gwamnati na ɗan gajeren lokaci ya koma Ganghwa Island, yanzu kudu da DMZ a cikin babban birnin Incheon, inda aka kori hare-haren jiragen ruwa na Mongol na kimanin shekaru goma kafin sarki ya mika wuya don dakatar da kisan gillar da Mongols suka aikata a cikin yankin, don jawo sarki.