Gang Yun-seong
Gang Yun-seong (; ? - December 1358) was a civilian of the Korean kingdom of Goryeo. He was a father of Queen Sindeok who was the second wife of King Taejo of Joseon or known as Yi Seong-gye. Biography. After he failed in Imperial examination in the time of Chunghye of Goryeo, he became a member of Hanlin Academy and constitute a major force in Goryeo regime. One of the reason why Taejo of Joseon married a daughter of Gang Yun-Seong was to build a foothold of the central political circle because Taejo of Joseon originally from  local clan. Family line. Gang Chung was a son of Gang Ho-gyeong, who was the 67th descendant of Gang Hou. Gang Hou was the second child of Gang Shu who was from Zingzhao country, Shangxi province in China. He had three children named I-Jegeon, Bo-Seung, and Gang Bo Yuk. Gang Bo Yuk married with his niece Gang Deju and their daughter Gang Sin-ui was born. Gang Sin-ui married with Chinese man and King Uijo of Goryeo was born. The father of King Uijo was royal family from Tang dynasty, China. According to "Pyeonnyeon-Tong-Long  () and Goryeosa jeolyo" (), he was Emperor Suzong of Tang. In "Pyeonnyeongangmog" (), Emperor Xuānzong of Tang was father of King Uijo. When his father visited Silla, King Uijo of Goryeo was born between his Chinese father and Gang Sin-ui who was a daughter of Gang Bo Yuk. On the way of finding his father to China, King Uijo met Queen Wonchang and get married with her. According to "Record of Seongwon" (), Queen Wonchang was a daughter of Tou En Dian Jiao Gan from Ping state (), China. Queen Wonchang gave birth of a boy. His name was Wang Ryung and his  son was the founder of Goryeo, Taejo of Goryeo. According to Korean history book like "Goryeosa" and "Pyeonnyeon-Tong-Long", Gang Yun-Seong was 6 generation descent of Gang Chiyon who was 14 generation descent of Gang Ho-gyeong the oldest ancestor of Taejo of Goryeo.