Yi Yo-sin (李堯臣, 12th generation descendant of the Deokdu Yi clan; 1542–1580). Mid-Joseon civil official. Ancestral seat: Deoksu. Courtesy name Yeoheum (汝欽), pen name Yulli (栗里). Posthumous rank: Senior Grand Master of Augmented Splendor, Minister of Revenue, Assistant Minister of Justice (Senior 2nd
Born~Died 1542 ~ 1580Last edited Oct 15, 2026, 2:51 PM
Yi Yo-sin (李堯臣, 12th generation descendant of the Deokdu Yi clan): Joseon, 1542 (Jungjong 37) – 1580 (Seonjo 13). Mid-Joseon civil official. Ancestral seat: Deoksu (德水). Courtesy name Yeoheum (汝欽), pen name Yulli (栗里). Posthumous rank: Senior Grand Master of Augmented Splendor, Minister of Revenue, Assistant Minister of Justice (Senior 2nd rank, Junior Secretary and Grand Chief Scholar1). His great-grandfather was Yi Geo (李琚), who served as Censor-in-Chief, Military Affairs Vice Minister and others; his grandfather was Yi Baengnok (李百祿), Gentleman of Seongyo and Service Officer of the Office of Markets. He was the son of Yi Jeong (李貞), Posthumous Left State Councillor and Deokyeon Buwon-gun, and the second elder brother of Admiral Yi Sun-sin (李舜臣).
Life
Born in the 37th year of Jungjong's reign (1542).
In the 9th year of Myeongjong (1554), studied at Donghak, one of the private academies in Seoul. (Presumed to be around age 13; fellow students included Seoae Ryu Seong-ryong and Hong Gasin.)
In the 15th year of Myeongjong (1560), studied at Gyesang Seodang of Toegye Yi Hwang (the place used by Yi Hwang at Onhye before he established Dosan Seodang). Others who studied in the same period included Kim Chwiryeo, Yi Gukpil, Kim Sawon, and Ryu Unryong (elder brother of Seoae Ryu Seong-ryong).
In the 18th year of Myeongjong (1563), his eldest son Yi Bong (李菶) was born.
In the 21st year of Myeongjong (1566), his second son Yi Hae (李荄) was born.
In the 6th year of Seonjo (1573), passed the Gyeyu (癸酉) regular state examination (式年試) [Saengwon], 2nd class, 22nd place (27/100).
As a disciple of Toegye Yi Hwang, and through his upbringing together with Seoae Ryu Seong-ryong in Geoncheon-dong, Hanseong, he influenced Seoae Ryu Seong-ryong's recommendation of his younger brother Admiral Yi Sun-sin as Naval Commander of the Left Jeolla Province (全羅左道水軍節度使) one year before the outbreak of the (1592).
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In the 13th year of Seonjo (1580), Gyeongjin (庚辰), died on the 23rd day of the first lunar month at the age of 39.
His spouse was Posthumous Jeongbu-in of the Cheongpum Kim clan, daughter of Kim Daeshin. Her grandfather was Chamjeong Kim Miseong, a 5th-generation descendant of Minister Kim Giltong; her maternal grandfather was Park Im of the Banam Park clan. Death anniversary: 29th day of the 2nd month.
His tomb is located at Goryongsan 12-38, Eumbong-myeon, Asan-si, Chungcheongnam-do, buried jointly in the ancestral graveyard along the Eorasan range behind the Yi Chungmu tomb and stele.
He had two sons and one daughter; the sons, Yi Bong and Yi Hae, were both recorded as Second-Class Meritorious Subjects of Sunmu Wonjong (선무원종공신).
Evaluation
The name Yo-sin (堯臣) was given by his father, Deokyeon Buwon-gun Yi Jeong, after Yao (堯), the legendary sage king of China.
As a disciple of Toegye Yi Hwang (李滉), he was sincere and diligent in his studies and held himself to very strict personal discipline. In the reign of Seonjo he rose to the post of Sama (司馬), and Toegye Yi Hwang encouraged him by writing out Zhu Xi's "Baekrokdong Bu" (白鹿洞賦) for him.
Yi Yo-sin (李堯臣) was precocious from childhood, distinguished himself among his fellow students at Donghak, and shared a close friendship with Ryu Seong-ryong, who would later become Chief State Councillor; he was an outstanding talent. He passed the preliminary examination early in his pursuit of a civil career, and his mother, Lady Chogye Byeon, was overjoyed, saying he would bring glory to the Deokdu Yi family; yet he fell ill and died young.2
The sons of Yulli Gong Yi Yo-sin (李堯臣), Yi Bong (李菶) and Yi Hae (李荄), were the only nephews of Admiral Yi Sun-sin (李舜臣) to be recorded as Second-Class Meritorious Subjects of Sunmu Wonjong (1605), after the Jeongyu War. That they continued in military office after the war shows that they possessed the qualities and courage of military officers.
Based on Yulli Gong Yi Yo-sin (李堯臣), his descendants were divided into the Yulli Gong branch (栗里公派) of the Deokdu Yi clan (德水李氏).
Family Relations
Great-grandfather: Yi Geo (李琚), Censor, Hallim, Doctor of the Hongmun Academy, Magistrate of Suncheon, Military Affairs Vice Minister
Grandfather: Yi Baengnok (李百祿), Gentleman of Seongyo and Service Officer of the Office of Markets
Grandmother: Chogye Byeon (草溪卞氏), daughter of Byeon Seong (卞誠)
Elder brother: Yi Hui-sin (李羲臣, 1535–1587), Posthumous Vice Minister of Military Affairs
Sister-in-law: Posthumous Jeongbu-in Jinju Gang clan (晉州姜氏), daughter of Gang Seeon (姜世溫)
Nephew: Yi Roe (李蕾, 1561–1648), Chalbang (Post Station Official)
Nephew: Yi Bun (李芬, 1566–1619), Junior Secretary of the Ministry of Military Affairs
Nephew: Yi Beon (李蕃, 1575–1668), Chamber Superintendent of Hyoreung
Nephew: Yi Wan (李莞, 1579–1627), Magistrate of Uiju and Commander of Uiju Jinkwan Forces; Posthumous Minister of Military Affairs, posthumous name Gangmin (剛愍); killed in battle during the Jeongmyo War
Self: Yi Yo-sin (李堯臣, 1542–1580), Posthumous Assistant Minister of Justice
Spouse: Posthumous Jeongbu-in Cheongpum Kim clan (清風金氏), daughter of Kim Daeshin (大頣)
Eldest son: Yi Bong (李菶, 1563–1650), Second-Class Meritorious Subject of Sunmu Wonjong, Commander of Gyeongsang Provincial Military Forces and Deputy Chief of the Five Garrisons Office, Commander of Pyeongan Provincial Military Forces, Commander of the Royal Guard, Chief Commander of Samcheok Port
Grandson: Yi Jigang (李之綱), Senior 6th rank Seongyo-rang (宣敎郎); Posthumous Chamber Superintendent of the Royal Stables (通訓大夫司僕寺正)
Granddaughter: Deoksu Yi clan
Younger brother: Yi Sun-sin (李舜臣, 1545–1598), Deokpung Buwon-gun, posthumous name Chungmu (忠武)
Sister-in-law: Jeongkyeong-buin Sangju Bang clan (尙州方氏; Onyang Bang clan)
Nephew: Yi Hoe (李薈, 1567–1625), Military Merit First Class, Chief Instructor of the Military Training Office; posthumous Senior Secretary of the Royal Secretariat (承政院左承旨)
Nephew: Yi Ye (李䓲, 1571–1631), Junior Secretary of the Ministry of Justice; posthumous Senior Secretary of the Royal Secretariat
Nephew: Yi Myeon (李葂, 1577–1597), posthumous Vice Minister of Personnel; killed in battle with Japanese forces during the Jeongyu War
Nephew: Yi Hun (李薰, 1574–1624), passed military examination; posthumous Vice Minister of Military Affairs; killed in battle while suppressing Yi Gwal's Rebellion
Nephew: Yi Sin (李藎, unknown–1627), passed military examination; posthumous Vice Minister of Military Affairs; killed in battle during the Jeongmyo War together with his cousin Yi Wan
Younger brother: Yi Usin (李禹臣, unknown), Chambong (Chamber Official)
Yi Yo-sin (李堯臣, 12th generation descendant of the Deokdu Yi clan): Joseon, 1542 (Jungjong 37) – 1580 (Seonjo 13). Mid-Joseon civil official. Ancestral seat: Deoksu (德水). Courtesy name Yeoheum (汝欽), pen name Yulli (栗里). Posthumous rank: Senior Grand Master of Augmented Splendor, Minister of Revenue, Assistant Minister of Justice (Senior 2nd rank, Junior Secretary and Grand Chief Scholar1). His great-grandfather was Yi Geo (李琚), who served as Censor-in-Chief, Military Affairs Vice Minister and others; his grandfather was Yi Baengnok (李百祿), Gentleman of Seongyo and Service Officer of the Office of Markets. He was the son of Yi Jeong (李貞), Posthumous Left State Councillor and Deokyeon Buwon-gun, and the second elder brother of Admiral Yi Sun-sin (李舜臣).
Life
Born in the 37th year of Jungjong's reign (1542).
In the 9th year of Myeongjong (1554), studied at Donghak, one of the private academies in Seoul. (Presumed to be around age 13; fellow students included Seoae Ryu Seong-ryong and Hong Gasin.)
In the 15th year of Myeongjong (1560), studied at Gyesang Seodang of Toegye Yi Hwang (the place used by Yi Hwang at Onhye before he established Dosan Seodang). Others who studied in the same period included Kim Chwiryeo, Yi Gukpil, Kim Sawon, and Ryu Unryong (elder brother of Seoae Ryu Seong-ryong).
In the 18th year of Myeongjong (1563), his eldest son Yi Bong (李菶) was born.
In the 21st year of Myeongjong (1566), his second son Yi Hae (李荄) was born.
In the 6th year of Seonjo (1573), passed the Gyeyu (癸酉) regular state examination (式年試) [Saengwon], 2nd class, 22nd place (27/100).
As a disciple of Toegye Yi Hwang, and through his upbringing together with Seoae Ryu Seong-ryong in Geoncheon-dong, Hanseong, he influenced Seoae Ryu Seong-ryong's recommendation of his younger brother Admiral Yi Sun-sin as Naval Commander of the Left Jeolla Province (全羅左道水軍節度使) one year before the outbreak of the Imjin War (1592).
In the 13th year of Seonjo (1580), Gyeongjin (庚辰), died on the 23rd day of the first lunar month at the age of 39.
His spouse was Posthumous Jeongbu-in of the Cheongpum Kim clan, daughter of Kim Daeshin. Her grandfather was Chamjeong Kim Miseong, a 5th-generation descendant of Minister Kim Giltong; her maternal grandfather was Park Im of the Banam Park clan. Death anniversary: 29th day of the 2nd month.
His tomb is located at Goryongsan 12-38, Eumbong-myeon, Asan-si, Chungcheongnam-do, buried jointly in the ancestral graveyard along the Eorasan range behind the Yi Chungmu tomb and stele.
He had two sons and one daughter; the sons, Yi Bong and Yi Hae, were both recorded as Second-Class Meritorious Subjects of Sunmu Wonjong (선무원종공신).
Evaluation
The name Yo-sin (堯臣) was given by his father, Deokyeon Buwon-gun Yi Jeong, after Yao (堯), the legendary sage king of China.
As a disciple of Toegye Yi Hwang (李滉), he was sincere and diligent in his studies and held himself to very strict personal discipline. In the reign of Seonjo he rose to the post of Sama (司馬), and Toegye Yi Hwang encouraged him by writing out Zhu Xi's "Baekrokdong Bu" (白鹿洞賦) for him.
Yi Yo-sin (李堯臣) was precocious from childhood, distinguished himself among his fellow students at Donghak, and shared a close friendship with Ryu Seong-ryong, who would later become Chief State Councillor; he was an outstanding talent. He passed the preliminary examination early in his pursuit of a civil career, and his mother, Lady Chogye Byeon, was overjoyed, saying he would bring glory to the Deokdu Yi family; yet he fell ill and died young.2
The sons of Yulli Gong Yi Yo-sin (李堯臣), Yi Bong (李菶) and Yi Hae (李荄), were the only nephews of Admiral Yi Sun-sin (李舜臣) to be recorded as Second-Class Meritorious Subjects of Sunmu Wonjong (1605), after the Jeongyu War. That they continued in military office after the war shows that they possessed the qualities and courage of military officers.
Based on Yulli Gong Yi Yo-sin (李堯臣), his descendants were divided into the Yulli Gong branch (栗里公派) of the Deokdu Yi clan (德水李氏).
Family Relations
Great-grandfather: Yi Geo (李琚), Censor, Hallim, Doctor of the Hongmun Academy, Magistrate of Suncheon, Military Affairs Vice Minister
Grandfather: Yi Baengnok (李百祿), Gentleman of Seongyo and Service Officer of the Office of Markets
Grandmother: Chogye Byeon (草溪卞氏), daughter of Byeon Seong (卞誠)
Elder brother: Yi Hui-sin (李羲臣, 1535–1587), Posthumous Vice Minister of Military Affairs
Sister-in-law: Posthumous Jeongbu-in Jinju Gang clan (晉州姜氏), daughter of Gang Seeon (姜世溫)
Nephew: Yi Roe (李蕾, 1561–1648), Chalbang (Post Station Official)
Nephew: Yi Bun (李芬, 1566–1619), Junior Secretary of the Ministry of Military Affairs
Nephew: Yi Beon (李蕃, 1575–1668), Chamber Superintendent of Hyoreung
Nephew: Yi Wan (李莞, 1579–1627), Magistrate of Uiju and Commander of Uiju Jinkwan Forces; Posthumous Minister of Military Affairs, posthumous name Gangmin (剛愍); killed in battle during the Jeongmyo War
Self: Yi Yo-sin (李堯臣, 1542–1580), Posthumous Assistant Minister of Justice
Spouse: Posthumous Jeongbu-in Cheongpum Kim clan (清風金氏), daughter of Kim Daeshin (大頣)
Eldest son: Yi Bong (李菶, 1563–1650), Second-Class Meritorious Subject of Sunmu Wonjong, Commander of Gyeongsang Provincial Military Forces and Deputy Chief of the Five Garrisons Office, Commander of Pyeongan Provincial Military Forces, Commander of the Royal Guard, Chief Commander of Samcheok Port
Grandson: Yi Jigang (李之綱), Senior 6th rank Seongyo-rang (宣敎郎); Posthumous Chamber Superintendent of the Royal Stables (通訓大夫司僕寺正)
Granddaughter: Deoksu Yi clan
Younger brother: Yi Sun-sin (李舜臣, 1545–1598), Deokpung Buwon-gun, posthumous name Chungmu (忠武)
Sister-in-law: Jeongkyeong-buin Sangju Bang clan (尙州方氏; Onyang Bang clan)
Nephew: Yi Hoe (李薈, 1567–1625), Military Merit First Class, Chief Instructor of the Military Training Office; posthumous Senior Secretary of the Royal Secretariat (承政院左承旨)
Nephew: Yi Ye (李䓲, 1571–1631), Junior Secretary of the Ministry of Justice; posthumous Senior Secretary of the Royal Secretariat
Nephew: Yi Myeon (李葂, 1577–1597), posthumous Vice Minister of Personnel; killed in battle with Japanese forces during the Jeongyu War
Nephew: Yi Hun (李薰, 1574–1624), passed military examination; posthumous Vice Minister of Military Affairs; killed in battle while suppressing Yi Gwal's Rebellion
Nephew: Yi Sin (李藎, unknown–1627), passed military examination; posthumous Vice Minister of Military Affairs; killed in battle during the Jeongmyo War together with his cousin Yi Wan
Younger brother: Yi Usin (李禹臣, unknown), Chambong (Chamber Official)