Prince Hyoeun (Korean: 효은태자; Hanja: 孝隱太子), personal name Wang Won (Korean: 왕원; Hanja: 王垣) or Wang Suk (Korean: 왕숙; Hanja: 王肅), also known by his title Prince Dongyang (Korean: 동양군; Hanja: 東陽君) and Grand Prince Dongyang (Korean: 동양대군; Hanja: 東陽大君) was a prince of Goryeo. He was the youngest son of Taejo of Goryeo and Lady Dongyangwon, and the 15th son of Taejo overall. Through his descendant, Wang Mi (Korean: 왕미; Hanja: 王亹, 1365-?), ninety percent of the modern day Kaesong Wang clan trace their lineage to Prince Hyoeun. He was the first grandson of (유달) whom served as Gongbusangseo (공부상서).