Founder of the Taesa-gong branch
| Era | 고려 예종 |
| Clan | 경주 김씨 |
Kim In-gwan is regarded as the founding ancestor of the Taesagong branch of the Gyeongju Kim clan. He is said to have held the honorary post of Geomgyo Taeja Taesa around the reign of King Yejong of Goryeo, and his line became one of the most prolific among the Gyeongju Kim branches, later giving rise to major sub-branches such as the Sangchongong line. His exact genealogical link to King Gyeongsun of Silla, however, is not fully established in surviving records.
The Taesagong branch split into numerous sub-branches from Kim In-gwan onward. His fifth-generation descendant Kim Ja-su (pen name Sangchon) passed the Goryeo civil service examination and served as governor of Chungcheong Province and Minister of Justice, then retreated into seclusion at Dumundong to preserve his loyalty when Goryeo fell, founding the Sangchongong line. Other sub-branches, including Ujaegong, Songjaegong, and Jeonseogong, were later named after the offices or pen names of prominent descendants; Kim Ja-su's great-great-grandson Kim Se-pil rose to vice minister of personnel before retiring to teach in Eumseong after the 1519 literati purge.