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Posthumous name
	Grand Prince Yeongseong; (영성대군, 永城大君; given in 1872 by King Gojong)

Yi Cheongye
Yi Cheongye
Grand Prince of Joseon (posthumously)
Born	Yi Cheon-gye; 1315 (before 1344); Goryeo
Died	1376; Goryeo
Spouse	Lady Bak
Issue	Yi Ran; Yi Seop; Yi Cheok; Yi Sil; Yi Jong; 3 daughters
Posthumous name
Posthumous name
	Grand Prince Yeongseong; (영성대군, 永城大君; given in 1872 by King Gojong)
House	House of Yi
Father	Yi Jachun (biological); Yi Jaheung (adoptive)
Mother	Lady, of the Hansan Yi clan
Korean name
Hangul	영성대군
Hanja	永城大君
Revised Romanization	Yeongseong Daegun
McCune–Reischauer	Yŏngsŏng Taegun
Art name
Hangul	석천
Hanja	石川
Revised Romanization	Seokcheon
McCune–Reischauer	Sŏkch'ŏn
Birth name
Hangul	이천계
Hanja	李天桂
Revised Romanization	I Cheongye
McCune–Reischauer	I Ch'ŏn'gye
Courtesy name
Hangul	순흠
Hanja	順欽
Revised Romanization	Sunheum
McCune–Reischauer	Sunhŭm
Posthumous name
Hangul	효민
Hanja	孝愍
Revised Romanization	Hyomin
McCune–Reischauer	Hyomin

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). Although he was older than Seong-gye, it was said that he was reluctant towards him.^[3] According to the records left, both Cheon-gye and his sister attempted a rebellion, but Seong-gye who know this suddenly stopped them. In 1376, a powerful man used his power to take over Cheon-gye's subordinate's wife but imprisoned under Seong-gye's command and died shortly after. In particular after his death, King Taejo posthumously granted him a sacrificial rite, and conferred the "Bulcheonwi" (불천위; 不遷位) while later received his posthumous name, Hyomin (효민; 孝愍) in 1871.^[4]

Yi married a daughter of Bak Jong-geon (박종건) from the Miryang Bak clan and had total of 5 sons and 3 daughters. 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.

Family

Father: Yi Jachun, King Hwan (이자준 환왕; 20 January 1315 – 3 June 1361)
Mother: Lady, of the Hansan Yi clan (부인 한산이씨; d. 1333)

Consorts and their respective issue(s):

Internal Princess Consort, of the Miryang Bak clan (부부인 밀양 박씨)
- Yi Ran, Prince Miryang (이란 밀양군; 1357 – 5 August 1428), 1st son
- Yi Seo, Prince Mireun (밀은군 이섭), 2nd son
- Yi Cheok, Prince Milchun ( 밀춘군 이척), 3rd son
- Yi Seol, Prince Mirreung (밀릉군 이실), 4th son
- Yi Jong, Prince Mirseong (밀선군 이종), 5th son
- Lady Yi, of the Jeonju Yi clan (이 씨), 1st daughter
- Lady Yi, of the Jeonju Yi clan (이 씨), 2nd daughter
- Lady Yi, of the Jeonju Yi clan (이 씨), 3rd daughter