Lady Mongryangwon of the Pyongsan Pak clan (), or Lady Mongnyangwon, was the daughter of Pak Su-gyà Âng who became the 29th wife of Taejo of Goryeo. Her aunt became his 26th wife and her cousin became his 28th wife. Her father was excellent in physical appearance, won every time went to war and took part in the fight against Kyà Ân Hwà Ân while rescued Wang Kà Ân from crisis when he was surrounded by the Later Baekje armies. It was said that he was entrusted with noble title and when Wang Kà Ân paid a tribute to consideration of his servants' merits, Pak Su-gyà Âng specially trusted with a special gift of 200 yards (200ê²°). Pak's families also maintained their power until the accession of Wang So. However, Wang So soon reorganized the system to strengthen the royal authority and purged the nobles which led Pak to death.