Crown Prince Sado
On 22 June 1759, Queen Jeongsun formally married King Yeongjo at Changgyeong Palace. This marriage was considered the oldest marriage in Joseon Dynasty history as Yeongjo was 66 years old, and the Queen was 15 years old at the time of the marriage. She was also 10 years younger than her husband's son and heir, Crown Prince Sado, and his daughter-in-law, Lady Hyegyeong.