Eo Yu-so

Eo Yu-so (魚有沼, 1434–1489) was a military officer of Joseon. His courtesy name was Jayu (子遊), and his family seat was Chungju. He took part in campaigns against the Jurchen on the frontier and in the suppression of Yi Si-ae's Rebellion. His posthumous name was Jeongjang (貞莊).

Life

Early life

Eo Yu-so was born in 1434 at Jihaeng-ri (present-day Jihaeng-dong, Dongducheon) in Idam-myeon, Yangju County, Gyeonggi Province, as the son of Eo Deuk-hae, who had served as commander of the naval and land forces of Pyeongan Province. His courtesy name was Jayu (子遊). In the first year of King Munjong (1451), at the age of 18, he entered government service through eumseo (蔭敍) and was appointed to the Naegeumwi.

Suppression of Yi Si-ae's Rebellion and merit certificate

Afterward, in the second year of King Sejo (1456), he passed the military examination as first place, and then served as Director of the Sabosi (司僕寺直長) and as an inspector (監察). In the sixth year of Sejo (1460), he achieved a great merit in the campaign against the "Yain" (野人), was promoted, and became Tongnyemun Tongchan (通禮文通贊). In the ninth year of Sejo (1463), he served as magistrate of Hoeryong and then took part in the suppression of Yi Si-ae's Rebellion. Yi Si-ae had also been a magistrate of Hoeryong; his father, Yi In-hwa, had served as magistrate of Pyeongheung-daebu (判永興大府使), and his grandfather had been a scion of a yangban family who served as Geomgyo Munhabusa (檢校門下府事). However, Yi Si-ae, having lost a parent and having retired from the post of Hoeryong magistrate, was at home when he rebelled together with his younger brother Yi Si-ham.¹

In the thirteenth year of Sejo (1467), he pacified Yi Si-ae's Rebellion as commander of the left great division. Afterward he was named a First-class Meritorious Subject of Jeokgae (適開功臣), enfeoffed as Lord of Yeseong, and specially promoted to . In the of that year, when the attacked the Jianzhou Guard, he achieved great merit as commander of the left great division, and in the twelfth month of that year he was honored with the Second-class Military Merit. After King Yejong ascended the throne, in the first year of (1469), he became military governor of , and in the second year of he was named a 4th-class Meritorious Subject of Jwari. He twice served as military governor of .