Yi Cheon-gye (Korean: 이천계; Hanja: 李天桂; died 1376), formally called Grand Prince Yeongseong (영성대군; 永城大君), was a warrior in the late Goryeo periods who became part of the early Joseon dynasty royal family member as the second son of Yi Jachun and half elder brother to Yi Seonggye, its founder.
[1] Cheon-gye was raised by his uncle, Yi Ja-heung in his early days[2] and appointed as a Chumil (추밀; 樞密) at the end of the Goryeo period alongside received his first title, Prince Wanseong (완성군; 完城君).
[3] According to the records left, both Cheon-gye and his sister attempted a rebellion, but Seong-gye who know this suddenly stopped them.
It was recorded that Lady Bak's tomb is located at Chukjeon-dong, Judong Temple (now Gama-dong, Huju-ri), Hamheung.
However, all were collapsed in 1866 and renamed by Song Rae-hui (송래희), a Sungkyunkwan governor while enshrined at Sedeok Temple.