Sejo of Joseon
| Sejo 세조 世祖 | |||||||||||||
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| King Emeritus of Joseon | |||||||||||||
| Tenure | 1 – 2 October 1468 | ||||||||||||
| Predecessor | Danjong | ||||||||||||
| Successor | Gojong | ||||||||||||
| King of Joseon | |||||||||||||
| Reign | 3 August 1455 – 1 October 1468 | ||||||||||||
| Enthronement | Geunjeongjeon Hall, Gyeongbokgung, Hanseong | ||||||||||||
| Predecessor | Danjong | ||||||||||||
| Successor | Yejong | ||||||||||||
| Chief State Councillor | |||||||||||||
| In office | 19 November 1453 – 3 August 1455 | ||||||||||||
| Predecessor | Hwangbo In | ||||||||||||
| Successor | Chŏng Inji | ||||||||||||
| Monarch | Danjong | ||||||||||||
| Born | 7 November 1417 Grand Prince Chungnyeong's Mansion, Hanseong, Joseon | ||||||||||||
| Died | 23 September 1468 (aged 50) Jeongjeon Hall, Sugang Palace, Hanseong, Joseon | ||||||||||||
| Burial | Gwangneung Mausoleum, Namyangju, South Korea | ||||||||||||
| Spouse(s) | |||||||||||||
| Issue among others... | Yejong of Joseon | ||||||||||||
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| Clan | Jeonju Yi | ||||||||||||
| Dynasty | Yi | ||||||||||||
| Father | Sejong of Joseon | ||||||||||||
| Mother | Queen Soheon | ||||||||||||
| Religion | Korean Confucianism (Neo-Confucianism) → Korean Buddhism | ||||||||||||
| Signature | |||||||||||||
| Korean name | |
| Hangul | 세조 |
|---|---|
| Hanja | 世祖 |
| RR | Sejo |
| MR | Sejo |
| Birth name | |
| Hangul | 이유 |
| Hanja | 李瑈 |
| RR | I Yu |
| MR | I Yu |
| Courtesy name | |
| Hangul | 수지 |
| Hanja | 粹之 |
| RR | Suji |
| MR | Suji |
| Monarchs of Korea | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Joseon monarchs | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sejo (Korean: 세조; Hanja: 世祖; 7 November 1417 – 23 September 1468), personal name Yi Yu (이유; 李瑈), sometimes known as Grand Prince Suyang (수양대군; 首陽大君), 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, Grand Prince Anpyeong. 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.