Sejo

Sejo of Joseon (2 November 1417 – 23 September 1468), personal name Yi Yu (Korean: 이유; Hanja: 李瑈), sometimes known as Grand Prince Suyang (Korean: 수양대군; Hanja: 首陽大君), was the seventh ruler 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 1455.