Due to intermarriage into the royal family, Princess Jeongmyeong was also his 5th great-grandaunt, and 4th great-grandmother.
King Yeongjo's first son, Crown Prince Hyojang, died at the age of 10, leaving Crown Prince Sado as King Yeongjo's only male descendant.
His grandfather, King Yeongjo took both of their deaths hard and severed from psychological trauma for some time.
Ten years later, in 1762, his grandfather, King Yeongjo, had his father, Crown Prince Sado, executed by locking him in a rice chest and starving him.
In 1870, during King Gojong of Joseon's 6th year of reign, his grave name was Uiryong Park (의령원; 懿寧園).