Danjong of Joseon

Danjong became king of Joseon at age 12 following the death of his father, King Munjong. His youth made him vulnerable to power struggles among the court, particularly from his uncle, Grand Prince Suyang (later Sejo).

Danjong was forced to abdicate by his uncle, Grand Prince Suyang, who seized the throne as King Sejo. Danjong was demoted to the rank of prince and placed under house arrest, ending his brief reign.

Six loyalist ministers (Sayuksin) who plotted to restore Danjong to the throne were discovered and executed by Sejo. The failed plot intensified Sejo's persecution of Danjong's supporters.

Danjong was murdered on Sejo's orders, likely by poisoning or forced suicide, at age 16. His death eliminated the last threat to Sejo's rule and solidified the usurper's hold on the throne.