The family of Gyeongwon Yi, the most representative hereditary aristocracy of Goryeo, monopolized power for over eighty years through repeated intermarriages with the royal house. In particular, Yi Ja-gyeom enjoyed the pinnacle of power by giving three of his daughters as queens to Yejong and Injong. Those opposed to him, including the king himself, attempted to oust him. Yi Ja-gyeom, however, launched a military counteraction, set the royal palace on fire and eliminated the opposing factions. Yi confined the king in his house and took over his powers. Furthermore, to assume the throne for himself, Yi tried to poison the king on several occasions. Later, the king ousted Yi Ja-gyeom with the help of Cheok Jun-gyeong, one of Yi’s men. Cheok was also executed later.