[2] Wang Yu was one of Yi Ja-yeon's (이자연) grandsons, and 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[3] and became Susado (수사도; 守司徒) in 1094 (ascension year of King Heonjong).
[4] 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)[5] while honoured as Duke Jinhan (진한공; 辰韓公).
According to the records left, Wang Yu together with others was once involved in an appeal to the king concerning their brother, Duke Buyeo's marriage.
[12] Meanwhile, their only sister married King Yejong–Daeryeong and Boknyeong's older brother as his 3rd wife and became known as Queen Munjeong (문정왕후; 文貞王后).