Lady Cheonanbuwon of the Gyeongju Im clan () was the daughter of Im-Eon who became the 11th wife of Taejo of Goryeo. Her father was a Cheonan Governor and two times came to Taejo as his envoy in 927. She bore Taejo 2 sons. Their first son《고려사》〈열전〉- 효성태자 married a daughter of King Jeongjong and Queen Munseong,《고려사》〈열전〉- 공주 (정종의 딸) but had no any issue. This son later murdered in the aftermath of the revenge law enforced by King Gyeongjong, his half nephew. It seems that her 2nd son also didn't have any issue and died young.《고려사》〈열전〉- 효지태자
References
External links 천안부원부인 on the Encyclopedia of Korean Culture .