Princess Jeongsin (Korean: 정신궁주; 정신공주; Hanja: 貞信宮主; 貞信公主; 1366–1421) was a Goryeo Royal Princess as the second daughter of King Gongyang and Royal Consort Sun.
[1][2] On 17 April 1390, she was honoured as Princess Jeongsin (정신궁주; 貞信宮主) along with her sisters,[3] then married with Woo Seong-beom (우성범) whom later honoured as Prince Danyang (단양군).
[4][5] However, in July 1392, after Yi Seong-Gye's ascension to the throne and made the new dynasty, Woo was sentenced to death and was beheaded along with Gang Hoe-gye (강회계), her younger brother-in-law.
Woo Seong-beom came from the Danyang Woo clan (단양 우씨; 丹陽 禹氏) who was the eldest son of Woo Hong-su (우홍수)[6] and the grandson of Woo Hyeon-bo (우현보).
[7] While the Princess's father-in-law tried to conspired, it was failed and died after being executed by Taejo's royal troops in 23 August.