Heungbang

Princess Heungbang was a Goryeo Royal Princess as the youngest daughter of King Taejo and Queen Sinmyeong. She was also the younger sister-in-law of King Gyeongsun of Silla, who later married her half brother, Prince Wonjang. From her title, Heungbang became the first Korean Princess who held the title gungju . The use of the title gungju for the king's daughter began with the case of Princess Heungbang. In addition, the title gungju was also used for princesses, and this form continued throughout the Goryeo periods.