Their Bon-gwan is in Chungju City, North Chungcheong Province.
[3] Their founder was Yu Geung-dal (유긍달) who was a Chungju powerful nobleman in the end of Kingdom of Unified Silla[3] and become the father of Queen Sinmyeongsunseong, Taejo of Goryeo's first queen consort and third wife.
She also become the mother of 5 princes (include Jeongjong of Goryeo, Gwangjong of Goryeo, and Great King Munwon) and 2 daughters (Princess Nakrang and Princess Heungbang).
[4][5] After died, Yu Geung-dal was honoured as Taesanaesaryeong (태사내사령, 太師內史令).
[6] [6] [6] In Saengwon (생원시) [6] In Jinsa (진사시) [6] All of them were actually from Gaeseong Wang clan (개성 왕씨), but for marriage with their relatives, they changed their clans followed maternal' line.