Cheongju Han clan topic's main category Korean nobility
The Cheongju Han clan (Hangul: 청주 한씨, Hanja: 淸州 韓氏) is a Korean royal family as well-known for the many female members including six queens. It is also called the House of Han or the Han clan of Cheongju. 
The Chengju Han clan is considered one of the most prominent clans since the Gojoseon period, currently, the Cheongju Han is known as a clan that has long been prominent in Korean politics, public service, business and arts.History
In the Silla dynasty, all of the Cheongju Hans were part of the seonggol rank. The clan provided the largest number of generals during the Joseon dynasty and were considered the highest of the yangban class, next to the royal Jeonju Yi clan. 
The members of the Han clan are descendants of the sage Jizi (or Gija), who was a noble from the Chinese Shang dynasty, and rode his white horse and set a nation in "The Farthest East". Their founder was King Jun, the last monarch of the Gija period, during the ancient Gojoseon Kingdom. The nobles with the surname Han were greatly praised, and not to be bothered.
The Cheongju Han clan is well-known for the many female members who produced most royal consorts including most six queens. They had produced six queens, five princesses consort, three royal concubines, 315 scholars, 12 Sangshin, 14 Gongshin, and 1 Daejejak throughout the Joseon dynasty.Queen Wisuk, the mother of Goryeo's founder, Wang Geon, was part of the clan. Another member was Queen Insu, wife of Crown Prince Uigyeong, and the first female author in Korean history, who wrote Naehun, a Confucian morality guidebook for women.