Jurchen people

The Jurchens were a Tungusic people who lived in Manchuria in present-day Northeast China. They were known as Jurchens until the 17th century when they became known as the "Manchu". 
The Jurchens established the Jin Dynasty. The Jurchen Wanyan Yingge's paternal nephew Wanyan Wuyashu however fought against the Koreans, forcing them to submit and recognize Jurchens as overlords after "pacifying" the border between the Koreans and Jurchens.
The Joseon Dynasty of Korea placed great value on a policy of "neighborly relations" ("gyorin" or "kyorin") with the Jurchen people.