Prince Eunsin (Korean: 은신군; Hanja: 恩信君; 11 January 1755 – 29 March 1771[1]), personal name Yi Jin (Korean: 이진; Hanja: 李禛), was a Korean prince, as the fourth son of Crown Prince Sado, and his concubine, Royal Noble Consort Suk of the Buan Im clan.
[3] In 1762, when his father was executed by King Yeongjo for treason, he was left unprotected and in poverty.
[9][10] On December 12, 1779, he was given the posthumous name "Somin" (소민; 昭愍); it was changed to "Chungheon" (충헌; 忠獻) on February 28, 1871.
He was given a new name, Yi Gu (이구; 李球), and received the title Prince Namyeon (남연군; 南延君; 1788–1836).
[11] Prince Namyeon was, through his fourth son, Heungseon Daewongun, the biological grandfather of Emperor Gojong of Korea.