Heonjong of Joseon

King Heonjong ascended the throne at age 7, with the Andong Kim clan continuing to dominate the court. Queen Sunwon acted as regent. The clan's corruption and factionalism weakened the state and led to widespread discontent.

As Heonjong grew older, he attempted to reduce the Andong Kim clan's power by promoting officials from other factions. However, his efforts were largely unsuccessful due to the clan's entrenched influence. He died before achieving significant change.

King Heonjong died at age 22 without a son, ending the direct line of succession. His death led to a succession crisis, with the Andong Kim clan choosing a distant relative (Cheoljong) as the next king, perpetuating in-law rule.