Lady Seongmu of the Pyeongsan Bak clan[1] (Korean: 성무부인 박씨; Hanja: 聖茂夫人 朴氏) was the daughter of Bak Ji-yun, one of Wang Geon's helper in founding the new Goryeo dynasty who became the 26th wife of Taejo of Goryeo.
[2] She gave birth to 4 sons[3] and a daughter who later married King Gyeongsun of Silla,[4][5] but all of her sons died young without left any issue.
Since both of Bak Su-mun (박수문) and Bak Su-gyeong (박수경) were her brothers, she then became the aunt of her husband's 28th and 29th wife.