Seosan Jeong clan

The Seosan Jeong clan (Korean: 서산 정씨; Hanja: 瑞山鄭氏) is a Korean clans. Their Bon-gwan was in Seosan, South Chungcheong Province. According to the South Korean census held in 2000, the number of Seosan Jeong clan was 15362. Their founder was Chŏng Ŭngch'ung [ja] living in Pujiang County, Zhejiang who was a government officer in Song dynasty. Chŏng Ŭngch'ung [ja] used to be a Yuanwailang (員外郎/员外郎). Then, he settled in Seosan of Goryeo after Song dynasty declined.^[1]