According to the Yongbieocheonga (the first work written in Hangul), Yi Seong-gye was born in 1336 and would later become one of Korea's greatest army generals and kings.
Yongbieocheonga literally means Songs of the Dragons Flying to Heaven and was the first work written in hangul. Yi Seong-gye was born in 1335. He had come from a long line of men who had served as government officials familiar with Mongolian customs, he and would later prove to be one of Korea's greatest army generals and kings. 
