King Sejo
| Yi Yu | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Portrait King Sejo of Joseon
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| King of Joseon | |||||||||
| Reign | 11 June 1455 – 23 September 1468 | ||||||||
| Predecessor | Danjong of Joseon | ||||||||
| Successor | Yejong of Joseon | ||||||||
| Born | 2 November 1417 | ||||||||
| Died | 23 September 1468 (aged 50) | ||||||||
| Consort | Queen Jeonghui | ||||||||
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| House | Jeonju Yi | ||||||||
| Father | Sejong the Great | ||||||||
| Mother | Queen Soheon | ||||||||
| Posthumous name | |
|---|---|
| King Sejo Hyejang Sungcheon Chedo Yeolmun Yeongmu Jideok Yunggong Seongsin Myeongye Heumsuk Inhyo the Great of Korea 세조혜장승천체도열문영무지덕융공성신명예흠숙인효대왕 世祖惠莊承天體道烈文英武至德隆功聖神明睿欽肅仁孝大王 |
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| Temple name | |
| Sejo |
| Sejo of Joseon | |
| Hangul | 세조 |
|---|---|
| Hanja | 世祖 |
| Revised Romanization | Sejo |
| McCune–Reischauer | Sejo |
| Birth name | |
| Hangul | 이유 |
| Hanja | 李瑈 |
| Revised Romanization | I Yu |
| McCune–Reischauer | I Yu |
| Courtesy name | |
| Hangul | 수지 |
| Hanja | 粹之 |
| Revised Romanization | Suji |
| McCune–Reischauer | Suji |
Sejo of Joseon (korean:조선 세조, 2 November 1417 – 23 September 1468, r. 1455–1468) was the seventh king of the Joseon Dynasty of Korea. Prime minister of Joseon Dynasty 1453 to 1455. He was brother of Munjong of Joseon and uncle of Danjong of Joseon. He produced a coup d'état and became king himself in 1455.
Born in 1417 as Yi Yu, King Sejong the Great's second son, he showed great ability at archery, horseriding and martial arts. He was also a brilliant military commander, though he never went to the battlefront himself. He became Grand Prince Suyang in 1428, the name by which he was better known.
Following King Sejong's death, Suyang's ill brother, Munjong, took the throne but soon died. The crown passed to his 12-year-old son, Danjong. The new king was too young to rule the nation, and all political processes were controlled by then-premier Hwangbo In and General Kim Jongseo, who was vice-premier. As Kim Jongseo and his faction used the chance to extend the power of court officials against many royal family members, the tension between Kim and Suyang greatly increased; not only Suyang himself, but his younger brother, Grand Prince Anpyeong, also sought an opportunity to take control of the kingdom.
Suyang surrounded himself with trusted allies, including his famous adviser, Han Myung-hoi. Han advised Suyang to take over the government in a coup, and on 10 November (10th day of the 10th lunar month) 1453, he killed Kim Jongseo and his faction, thereby taking the reins of power into his own hands. After the coup he arrested his own brother, Anpyong, first sending him into exile, then putting him to death.
Finally in 1455 he forced his powerless young nephew, Danjong, to abdicate, declaring himself seventh king of the Joseon dynasty. Later he demoted Danjong to prince and ordered him to be poisoned after his younger brother, Grand Prince Geumsung, and later six scholars including Seong Sam-mun, Pak Paeng-nyeon, and Yi Gae plotted to remove the Suyang from power in an attempt to put Danjong back on the throne.
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