Duke Gangneung (died 1146), personal name Wang On (Korean: 왕온; Hanja: 王溫), was a member of the royal family of Goryeo as the grandson of King Munjong.
[1] Through his daughters, he became the father-in-law of the three successive kings (Uijong, Myeongjong, Sinjong)[2] and the maternal grandfather of Huijong and Gangjong.
[3] Wang On had two older brothers, they were:[1] Not much information left about his life beside that he received the resident country from his half first cousin and in 1143, he received his royal title as Marquess Gangneung (강릉후; 江陵侯) under his half first cousin once removed's command.
[4] He was also given 700 Sik-eup (식읍 700호) and 300 Sik-sil (식실 300호), but eventually died in 1146 and received his new title as Duke Gangneung (강릉공; 江陵公).
[1] As the same clan couldn't get married, so the three queens were followed their maternal clan ("Kim"; 김, 金) and since his 5 children were all married to King Injong's children, so Wang On and Injong have a five-fold in-law relationship.