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Seongjong of Joseon (19 August 1457 – 20 January 1495), personal name Yi Hyeol (Korean: 이혈; Hanja: 李娎), was the ninth ruler of the Joseon dynasty of Korea. Before succeeding his uncle, King Yejong, he was known as Grand Prince Jalsan (Korean: 잘산대군; Hanja: 乽山大君).