Ryu Cheon-gung

Ryu Cheongung (Korean: 류천궁; Hanja: 柳兢達;[2] Ryu Cheon-gung) or known as Senior Ryu (Korean: 류장자; Hanja: 柳匠子)[3] was a rich-nobleman in the Later Three Kingdoms Period[4] who became the father of Queen Sinhye and father in-law of Wang Geon, Goryeo dynasty's founder.[5]

During Jinseong of Silla's reign, Ryu was a nobleman from Paseo region (along with Wang Ryung from Songak, Bak Ji-yun from Pyeongju, Hwangbo Je-gong from Hwangju, etc.) which later became "Jeongju Region" (정주, 貞州) and since he was a wealthy man who accumulated wealth through Commerce through the sea, the locals called him as "Senior" (장자, 長者).[4] Although they independently against Gung Ye, they finally surrendered to him and Wang's son, Wang Geon, became Gung's general and took over the west coast (include Ganghwa Island. Ryu was said to treated Geon's army generously and made his daughter sleep with him, which this girl was the future Queen Sinhye. Ryu actively provided ship technology and knowledge acquired through maritime trade to Wang and Jeongju Port became an outpost where Wang became a naval general and built ships and trained naval forces to conquer Geumseong (Naju). Then, after the establishment of Goryeo dynasty, Ryu became Three Grand Masters (along with Bak Yeong-gyu and Hwangbo Je-gong) and had the most strong influence in the early Goryeo.[4]