Jeong Dojeon (1342-1398), also known by the pen name Sambong, was a medieval Korean scholar and politician. He was an influential Neo-Confucian ideologue and served as a close advisor to Yi Seonggye, the founder of the Joseon dynasty. Wikipedia
The definitive Wikipedia entry for Jeong Dojeon. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Jeong_Dojeon