built by King Jeongjo, specifically to memorialize and honor his father's tomb (the construction lasted 1794-1796, while the official reception was 1795). Lady Hyegyeong died and was buried with her husband in 1816. Prince Sado and Lady Hyegyeong were posthumously elevated in status and given the titles Emperor Yangjo and Empress Heonyeong in 1899 during the reign of Emperor Gwangmu (Gojong). Their tomb and the adjacent tomb of their son, King Jeongjo, and his wife, Queen Hyoui, were upgraded accordingly and renamed Yungneung. Taboo and reinstatement Prince Sado was reinstated fifteen days after he died but King Yeongjo banned any mention of the prince's name for the rest of his reign. Because of this decision, Prince Sado's son, Jeongjo, who ascended the throne following the passing of King Yeongjo, as the heir to his deceased half-uncle (Crown Prince Hyojang) instead. One of Jeongjo's first statements upon becoming king, however, was to declare, "I am the son of Prince Sado." Jeongjo always showed great filial devotion to his father, Crown Prince Sado, and he changed the posthumous name of his father's to a longer one, which is the origin of the latter's alternative title, Crown Prince Jangheon. Family Father: King Yeongjo of Joseon (조선 영조) (31 October 1694 – 22 April 1776) Grandfather: King Sukjong of Joseon (조선 숙종) (7 October 1661 – 12 July 1720) Biological grandmother: Royal Noble Consort Suk of the Haeju Choe clan (숙빈 최씨) (17 December 1670 – 9 April 1718) Adoptive grandmother: Queen Inwon the Gyeongju Kim clan (인원왕후 김씨) (3 November 1687 – 13 May 1757) Biological mother: Royal Noble Consort Yeong of the Jeonui Yi clan (영빈 이씨) (15 August 1696 – 23 August 1764) Grandfather: Yi Yu-beon (이유번) Grandmother: Lady Kim of the Hanyang Kim clan (한양 김씨) Adoptive mother: Queen Jeongseong of the Daegu Seo clan (정성왕후 서씨) (12 January 1693 – 3 April 1757) Consorts and their Respective Issue(s): Queen Heongyeong of the Pungsan Hong clan (헌경왕후 홍씨) (6 August 1735 – 13 January 1816) Yi Jeong, Crown Prince Uiso (의소세자 이정) (27 September 1750 – 17 April 1752), first son Grand Heir Yi San (28 October 1752 – 18 August 1800) (왕세손 이산), second son Royal Princess Cheongyeon (1754 – 9 June 1821) (청연공주), first daughter Royal Princess Cheongseon (1756 – 20 July 1802) (청선공주), second daughter Royal Noble Consort Suk of the Buan Im clan (? – 1773)