- Source: Princess Jeonghwa (Hwanjo)
Lady Yi of the Jeonju Yi clan or posthumously called as Princess Jeonghwa, was the fifth child, second and youngest daughter of Yi Cha-ch'un and also a full younger sister of Yi Sŏng-gye, the founder of the Joseon Dynasty.
In 1392, her brother made a new dynasty, their father was granted royal title as King Hwan (환왕; 桓王; later Hwanjo; 환조; 桓祖) and their mother was granted the title as Queen Ui (의비, 懿妃; later Queen Uihye; 의혜왕후; 懿惠王后). Under Emperor Gojong of Korea's command, she was then posthumously honoured as Princess Jeonghwa (정화공주; 貞和公主) in 1872. She married Cho In-byŏk, son of Cho Ton from Hanyang Cho clan (한양 조씨; 漢陽 趙氏). After the Joseon Dynasty was established, Cho was then honoured as Internal Prince Yongwon (용원부원군).
Family
Father: Yi Cha-ch'un (이자춘; 1315–1360) – son of Yi Ch'un and Lady Pak.
Mother: Lady Ch'oe (최씨; 1304–?) – daughter of Ch'oe Han-gi and Lady Yi.
Brother: Yi Sŏng-gye (이성계; 1335–1408)
Husband: Cho In-byŏk, Internal Prince Yongwon (조인벽 용원부원군; 1327–?) – son of Cho Ton and Lady Yi.
Adopted daughter: Lady Cho (조씨; 1340–?)
First daughter: Lady Cho (조씨; 1343–?) – married Hwang Kil-wŏn (황길원).
Second daughter: Lady Cho (조씨; 1345–?) – married Im Maeng-yang (임맹양).
First son: Cho Pu (조부; 1347–?)
Adopted son: Cho On, Internal Prince Hancheon (조온 한천부원군; 1347–1417) – married firstly with Lady Jang, then remarried again with Lady Bak.
Second son: Cho Paek (조백; 趙伯; 1365–?)
Third son: Cho Po (조보; 趙保; 1368–?)
Third daughter: Lady Cho (조씨; 1370–?)
Fourth son: Cho Hu (조후; 1372–?)
Fifth son: Cho Yŏn, Internal Prince Hanpyeong (조연 한평부원군; 1374–1429) – married Lady Kim.
Sixth son: Cho Sa (조사; 1378–1432)