Queen Munhye of the Chŏngju Yu clan (Korean: 문혜왕후 유씨; Hanja: 文惠王后 柳氏) was a Goryeo princess^[1] as the first and oldest daughter of King Taejo and Queen Jeongdeok who became the wife of her half brother, King Munwon.^{[2][unreliable source?]} With this marriage, she then followed her maternal clan, the Chŏngju Yu.^[3] Though her younger sister, she would become the maternal aunt of King Seongjong and became the mother-in-law of her half nephew, King Gyeongjong since her only daughter married him as his second wife. Alongside her husband who was posthumously honoured as a king, she was also posthumously honoured as a queen.