Yi Ch'un (? – August 25, 1342) or known for his Mongolian name Bayan Temür (Mongolian script: Баян төмөр; Pai-yen tö-mör) was the grandfather of Yi Sŏng-gye, founder of the Joseon Dynasty.
From Yuan dynasty, he replaced his father, Yi Haeng-ni () as a chiliarch. He later married Lady Pak of the Munju Pak clan (문주 박씨; the future Queen Gyeongsun) and had 2 sons, they were: Yi Cha-hŭng and Yi Cha-ch'un, the biological father of Yi Sŏng-gye. After Pak's death, Yi remarried again with Lady Cho (), the daughter of Cho Yang-gi (). In 5 August 1392, his grandson, Yi Sŏng-gye founded the Joseon Dynasty and he posthumously honoured his grandfather as King Gonguiseongdo the Great () and gave him the temple name Dojo (). He was buried in Uireung, Hamheung-si, Hamgyeongnam-do and his wife was buried in Sulleung, Heungnam-si, Hamgyeongnam-do.
Family
Father: Yi Haeng-ni, Ikjo of Joseon (조선 익조; 1236–?) Grandfather: Yi An-sa, Mokjo of Joseon (조선 목조; 1204–1274) Grandmother: Queen Hyogong of the Pyeonchang Yi clan (효공왕후 이씨; 1207–?) Mother: Queen Jeongsuk of the Deungju Ch'oe clan (1232 – 20 September ?) Grandfather: Ch'oe Ki-yŏl, Prince Anbyeon (; 1205–?) Wives and their Children(s): Queen Gyeongsun of the Munju Pak clan (경순왕후 박씨; 1268–?) Princess Munhye (; 1283–?) – married Mun In-yŏng (), first daughter Princess Munsuk (; 1285–?) – married Kim Ma-bun (; 1285–?), second daughter Yi Cha-hŭng, Grand Prince Wanchang (완창대군; 1287–?), first son Yi Pyŏng, Grand Prince Wancheon (; 1311–?), second son Yi Cha-ch'un, Hwanjo of Joseon (환조 조선; 1313 – 3 May 1360), third son Yi Cha-sŏn, Grand Prince Wanwon (이자선 완원대군; 1317–1356), fourth son Yi Chong, Grand Prince Wanseong (이종 완성대군; 1320–1385), fifth son Lady Jo of the Hanyang Cho clan (; 1304–?); daughter of Cho Yang-gi (). Yi Wanja, Prince Bulhwa (; 1323–?), sixth son Yi Nan-hae (; 1325–?), seventh son Princess Munsuk (문숙공주; 1329–?) — married Kim (김방쾌; 1326–?), third daughter Princess Munui (; 1331–?) – married Hŏ Chung (; 1328–?), fourth daughter
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