Sejo of Joseon
Sejo (; 7 November 1417 – 23 September 1468), personal name
Yi Yu (), sometimes known as
Grand Prince Suyang (), was the seventh monarch of the
Joseon dynasty of
Korea. He was the second son of
Sejong the Great and the uncle of
King Danjong, against whom he led a ''
coup d'état'' in 1453. After seizing power he killed rivals, including his brother, . During his reign, he strengthened the monarchy, reformed administration, suppressed rebellions, and led campaigns against the
Jurchens. He revised land laws, promoted literature, and established court music. His
Grand Code for State Administration became Joseon's foundational legal framework.
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