Crown Prince Uiso

Crown Prince Uiso (; 27 September 1750 – 17 April 1752), personal name Yi Jeong, was the elder son of Crown Prince Sado and Lady Hyegyeong. He was born as second in line to the throne during the reign of his grandfather, King Yeongjo, the 21st monarch of Joseon. His younger brother became King Jeongjo.

Biography His mother, Lady Hyegyŏng of the Pungsan Hong clan was the great-great-great-granddaughter of Princess Jeongmyeong, the only daughter of Queen Inmok and King Seonjo. Due to intermarriage within the royal family, Princess Jeongmyeong was also his 5th great-grandaunt and 4th great-grandmother.

His maternal grandfather was Chief State Councilor Hong Bong-han, whose younger brother was Hong In-han, another prominent official of the period.

Yi Jeong was the first grandson of the King Yeongjo and his father, Crown Prince Sado, was Yeongjo's second and only surviving son (his elder brother, Crown Prince Hyojang, had died at the age of 9, seven years prior to Sado's birth). Sado suffered from severe mental disorders and was often at odds with his father.

Yi Jeong was born in 1750, in Changgyeonggung. Half a year later, King Yeongjo declared him grand heir (왕세손; 王世孫).

In December 1751, his aunt-in-law, Crown Princess Hyeon, died. Soon after, on 17 April 1752, Yi Jeong also passsed away. Yeongjo took both of their deaths hard and grieved for some time.

He was given a state funeral, on special instructions from his grandfather. Yeongjo gave him the posthumous name Uiso (의소; 懿昭), and personally composed the eulogy and epitaph. His body was buried to the south of Mount Ahnhyon, and the tomb was known as Uisomyo (의소묘; 懿昭墓).

His younger brother, Yi San, was born several months after his death; he became gand heir in 1759, and would ascend to the throne in 1776. In 1762, Crown Prince Sado was executed through starvation after being locked in a rice chest.

During Gojong's reign, his tomb was upgraded to Uiryeongwon (의령원; 懿寧園). On 7 June 1949, it was relocated to the Seosamneung Cluster in Goyang, Gyeonggi Province.

Family Father: King Jangjo (; 13 February 1735 – 12 July 1762) Grandfather: King Yeongjo (; 31 October 1694 – 22 April 1776) Biological grandmother: Concubine Yeong , of the Jeonui Yi clan (; 5 August 1696 – 12 August 1764) Adoptive grandmother: Queen Jeongseong , of the Daegu Seo clan (; 2 January 1693 – 23 March 1757) Mother: Queen Heongyeong , of the Pungsan Hong clan (; 6 August 1735 – 1 January 1816) Grandfather: Hong Bong-han , Internal Prince Yeongpung (; 1713–1778) Grandmother: Internal Princess Consort Hansan , of the Hansan Yi clan (; 1713–1755)

Ancestry