Chancellor who took part in suppressing the Yi Ja-gyeom rebellion; an in-law of the throne who did not abuse his position; posthumous title Munchung
| Life | 1059 ~ 1137 |
| Era | 고려 중기 |
| Clan | 인천 이씨 |
Yi Gong-su (李公壽, 1059-1137) was a mid-Goryeo civil official from Incheon, originally named Su, courtesy name Wonro, posthumous title Munchung. Grandson of Right Vice Director Yi Ja-sang and son of Grand Councillor Yi Ye, his mother was a Haeju Choe, daughter of Chancellor Choe Yu-seon and granddaughter of Choe Chung, making Choe Chung his maternal great-grandfather. He was a grand-nephew of Yi Ja-yeon, a sixth cousin of Yi Ja-gyeom and Yi Ja-ui, and a relative of the family of Yi In-ro.
He passed the examination in 1086 and rose through posts in the Hallim Academy and the Remonstrance; as Vice Magistrate of Seogyeong he was praised by Yejong for governing well. After serving in the Ministries of Rites and Punishments and as Censor, he spent fourteen years as Vice Minister of War selecting troops without partiality. Under Injong he became Minister of Works, then Participant in Government Affairs and Vice Chancellor.
When Yi Ja-gyeom rebelled he did not join but took part in the suppression, and after it was put down in 1126 he was appointed Director of the Ministry of Personnel and of National History; in 1127 he became Munha Sijung and examiner, selecting 33 graduates including Wang Jwa-jae. For his service he was named a merit subject, promoted and retired as Chancellor. Though an in-law of the throne he is said never to have used his power for private gain, a contrast to Yi Ja-gyeom of the same clan. He had six sons, and his line is said to have continued in civil office.
He is said to have handled troop selection impartially for fourteen years as Vice Minister of War.
He refused to join the rebellion, took part in suppressing it, and afterwards served as Director of Personnel and Chancellor.
His tomb was not confirmed.
Sons Yi Ji-jeo, Yi Ji-gan, Yi Ji-mu, Yi Ji-hye, Yi Ji-ui and Yi Ji-cheol. Yi In-ro and Yi Jang-yong belong to related branches of the same house.