Duke of Jinhan

Born as the youngest son of Munjong of Goryeo and Princess Suryeong, he was named Yu (유, 愉) and have 2 older brothers: Wang Do and Wang Su.[3] Wang Yu was one of Yi Ja-yeon (이자연)'s grandson, paternal half brother or maternal first cousin to Sunjong, Seonjong, and Sukjong.

In 1086, Wang Yu was appointed as Geomgyotaewi Susagong (검교태위 수사공, 檢校太尉 守司空) along with his other brothers[4] and became Susado (수사도, 守司徒) in 1094 (ascension year of King Heonjong).[5] Wang Yu was also promoted into Sangseoryeong (상서령, 尙書令) a year later alongside given "6,000 Sik-eup" (식읍 6,000호) and "400 Sik-sil" (식실 400호)[6] while honoured as Duke Jinhan (진한공, 辰韓公).

According to the records left, Wang Yu once, along with Marquess Geumgwan, Marquess Byeonhan, and others were involved on Duke Buyeo's case that marry their own sister, Princess Jeokgyeong (적경궁주) by citing that it was an incestuous marriage and accused it of injustice, but their elder brother, King Seonjong rejected to hear it.

In 1099 (4th years reign of King Sukjong), Duke Jinhan died[7] and was given the name Hwasin (화신, 和信) as his Posthumous name.[8] His elder son would marry Princess Daeryeong (대령궁주)–King Sukjong's 1st daughter and became "Count Hoean" (회안백, 淮安伯),[9] while his younger son would marry Daeryeong's youngest sister, Princess Boknyeong (복녕궁주) and became "Count Jingang" (진강백, 晉康伯) in 1120.[10] Count Hoean was later died in 1126[11] and Count Jingang died in 1146.[12] Meanwhile, their only sister would marry to King Yejong–Daeryeong and Boknyeong's older brother as his 3rd wife and then known as Queen Munjeong (문정왕후, 文貞王后).