Jeonju clan

The founder of this clan was Yi Han, a native of Baekje who later married a Silla princess and became a high-ranking official in Silla. His 22nd-generation descendant, Yi Seong-gye, went on to found the Joseon Dynasty. The House of Yi ruled the country for 518 years (between 1392 and 1910) and established many of the cultural, artistic and linguistic foundations for modern-day Korea.

During its reign, the House of Yi consolidated its effective rule over the territory of current Korea, which encouraged the entrenchment of Confucian ideals and doctrines in Korean society, imported and adapted Chinese culture, and promoted classical Korean culture, trade, science, literature, and technology.

As of 2005^[update], the pretender to the Joseon throne is Yi Seok.^[7] Members of the different branches of Jeonju Yi survived until the formation of the current Republic of Korea. Many families claim membership in the House of Yi, but few actually descend from this lineage. South Korea's first president, Syngman Rhee, claims descent from the lineage.

Gyeongju clan

The founder of the Gyeongju clan was Yi Al-pyeong (李謁平), one of the village headmen who chose Park Hyeokgeose as the first King of Silla. According to the Samguk Sagi, the Yi name was officially bestowed on the family by King Yuri around 9 CE.

The Gyeongju Yi clan, according to the 2000 South Korean census, numbered over 1.4 million individuals, making it the most numerous of the clans that bear the surname Yi.^[8]

Jinwi clan

The Jinwi Lee clan is based on the old names of Jinwi-gun, the current Gyeonggi Province, Pyeongtaek-si, and Jinwi-myeon. The Jinwi Lee clan involved in political education for the royal family and served as an adviser to the king and teacher to the crown prince for generations of Goryeo Dynasty. The Jinwi clan is a family that turned out six queens during the Joseon Dynasty. Lee Bang, who served as an adviser to the king and a teacher to the crown prince in the early Goryeo Dynasty, is the founder. Lee Bang's ancestors are the descendant of Lee Geomyeong, an ancestor of Gyeongju Lee Clan.

Pyeongchang clan

The founder of the Pyeongchang clan was Yi Gwang, an official and military commander during the Joseon Dynasty. Yi Seung-hun, who was the first person that brought Catholicism to Korea, was a member of this clan. This was a yangban clan, founded somewhere between 1580 and 1607.

Deoksu clan

The founder of this clan was Yi Dong-su, an official of the Goryeo period. This was a prominent yangban clan during the Joseon Dynasty, producing figures including the legendary admiral Yi Sun-sin and the highly influential government official and philosopher Yi I. The clan takes immense pride in producing both Korea's top military commander and arguably top scholar. Both Yi Sun-shin and Yi I are depicted on South Korea's money and have taekwondo forms named in their honor. The clan seat, corresponds to Deoksu-hyeon, an old division of what is now Kaepung County, North Korea.

Jinbo clan

The Jinbo Yi clan was known for the famous Joseon scholar Yi Hwang, who founded the Yeongnam School and started a private Confucian academy. He also became one of the 18 Sages of Korea (동방 18현).^[9] The progenitor of this clan was Yi Seok of the Goryeo Dynasty.

Seongju clan

The founder of this clan was Yi Sun-yu, a prominent official of late Silla. His 12th-generation descendant, Yi Jang-gyeong, was also a prominent official during the Goryeo Dynasty. Eight generations of Jang Kyung's descendants yielded 75 civil examination qualifiers. As of the 2000 census, 186,188 Koreans of the Seongju Yi clan live in South Korea.

Hongju clan

The founder of the Hongju Yi clan was Yi Yu-seong, a member of the King's inner circle during late Goryeo. The clan's ancestral seat was bestowed when his 9th generation descendant, Yi Gi-jong, was titled. Hongyang/Hongju is located in present-day Hongseong County, South Chungcheong Province. Especially during the late Goryeo and early Joseon Dynasties, the Hongju Yi clan produced many influential people, including Yi Jong-jang.

Yeonan clan

The Yeonan Yi clan were aristocrats during the Joseon Dynasty. Several members were Chief State Councillors. The clan also had a high number of Chief Scholars during that period. The progenitor was Yi Mu, who came from Tang China.

Hansan clan

It is based in Hansan-myeon, Seocheon County, South Chungcheong Province. There are two different branches (Hojanggong family and Kwonjigong family). The founder of this clan is Yi Yoon-kyung. One member of the clan is Yi Saek, a Confucian scholar during late Goryeo. He founded an academy that educated the founders of Joseon. The Hansan Yi clan also produced many scholars in the Joseon Dynasty such as Yi San-hae. Modern figures belonging to Hansan Yi clan include Yi Sang-jae, an independence activist during the Japanese occupation.