Prince Jeongwon (Korean: 정원군; Hanja: 定原君) or formally called as Internal Prince Jeongwon (정원부원군; 定原府院君), personal name Wang Gyun (왕균; 王鈞) was a Goryeo Royal family member as the great-great-great-grandson of Duke Yangyang who became the father of the last monarch, Gongyang.
[1] One year later, Gyun went again to Yuan to receive Eoju (어주; 御酒) and while back, he was given the title of Count Jeongwon (정원백; 定原伯).
In 1355, he went to the Yuan dynasty along with Gim Jin (김진)[2] and went to "Harye Temple" (하례사) in Yuan in 1358 and after back became Buwongun.
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