Ulsan O clan

Ulsan O clan (Korean: 울산 오씨; Hanja: 蔚山吳氏) was one of the Korean clans. Their Bon-gwan was in Ulsan. According to the research in 1985, the number of Ulsan O clan was 2696. Their founder was O Yeon ji [ja]. O Yeon ji [ja] was a 7th descendant of Oh In yu [ja] who was a founder of Haeju Oh clan. Oh In yu [ja] came over from China during Seongjong of Goryeo’s reign in Goryeo. Oh In yu [ja] passed Imperial examination during Chungnyeol of Goryeo’s reign in Goryeo. As a result, O Yeon ji [ja] served as a munha sirang pyeongjangsa (Korean: 문하시랑평장사; Hanja: 門下侍郞平章事) and began Ulsan O clan. Then, O Yeon ji [ja] was appointed as Prince of Hakseong (Hanja: 鶴城君) because he defeated Wokou.^[1]

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