Jeongseon Lee clan (, ) is a Korean clan. Their Bon-gwan is in Jeongseon County, Gangwon Province (historical). According to the research held in 2000, the number of Jeongseon Lee clan's member was 3657. The Jeongseon Lee clan claims to be of Vietnamese origin, descending from , known as Lý Dðáng Côn in Vietnamese.
According to the genealogical records of the Jeongseon Lee clan, their founder was who was exiled to the Song dynasty and was settled in Qìng Prefecture during Emperor Huizong of Song's reign and then fled to Goryeo to avoid war with the Jin dynasty (1115âÂÂ1234). was originally born as a third son in Lý dynasty, Vietnam when Lý Nhân Tông, 5th king, ruled. He was the younger brother of Lý Thần Tông. However, he exiled himself to Song dynasty because he was involved a succession dispute. In Korean, Lý Dðáng Côn became known as Yi Yanggon. The son of Yi Yanggon, Yi Nan, (), became a Minister of Rites (), and Yanggon's grandson, Yi Muchà Âng () was a junior second-grade official as a senior executive in letters (). The sixth generation descendent of Yi Yanggon was Yi à ¬imin, who was born of slave origin but participated in the 1170 military coup and later became the military ruler of Goryeo.
The credibility of claim of descent from the Lý dynasty is questionable. Lý Nhân Tông was the fourth emperor not the fifth king and was recorded as having no children in the ÃÂại Viá»Ât sá» ký toàn thð, meaning neither Lý Thần Tông nor Lý Dðáng Côn were his sons. Lý Thần Tông was also born in 1116, meaning that Lý Dðáng Côn had to be born after 1116, as his younger brother. It would be near impossible for Yi à ¬imin, who took part in the 1170 military coup, to be his sixth generation descendant.