Queen Heonjeong

Queen Heonjeong of the Hwangju Hwangbo clan, or formally called as Grand Queen Mother Hyosuk during her son's reign, was a Goryeo royal family member as the third daughter of Wang Uk and youngest sister of King Seongjong. She later became the fourth wife of her first cousin, King Gyeongjong. After his death, she had an affair with her half uncle, giving birth to King Hyeonjong.