Lady Dongyangwon
Lady Dongyangwon of the Pyeongsan Yu clan was the daughter of Yu Geum-Pil who became the 9th wife of Taejo of Goryeo. Her father was a representative general under his command who showed many achievements, such as helping Taejo on several battlefields and gave the big contribution with participating in the unification of the Later Three Kingdoms and established the new Goryeo dynasty. Both of Yu Geung, Yu Gwan-yu and Yu Gyeong were her brothers. She bore Taejo 2 sons: Wang Ui and Wang Won.
However, her 2nd son was murdered by his half brother, Gwangjong of Goryeo due to Won's rebellion plotted and his two sons were escaped from their death, but after King Mokjong was dethroned and King Hyeonjong took the throne, they were reinstated and placed as an enemy of the Royal household.