Queen Jeonghui, of the Papyeong Yun clan, was a posthumous name bestowed on the wife and queen of Yi Yu, King Sejo. She was Queen of Joseon from 1455 until her husband's death in 1468, after which she was honoured as Queen Dowager Jaseong during the reign of her son, Yi Hwang, King Yejong, and as Grand Queen Dowager Jaseong during the reign of her grandson, Yi Hyeol, King Seongjong.
Lady Yun is the first Joseon royal consort to receive the title of Grand Queen Dowager. She also served as regent for her young grandson between 1468-1476 with her daughter-in-law, Queen Dowager Insu as adviser, after the sudden death of Yejong in 1469.