Prince Wonjang (Korean: 원장태자; Hanja: 元莊太子) was a Goryeo Royal Prince as the third son of King Taejo and Queen Jeongdeok[1] who married his half sister, Princess Heungbang[2] and had a son[3] and a daughter who would become King Gyeongjong's 5th wife.
[4] • Prince Wonjang on Encykorea (in Korean).