Jurchen people
Before coming under Khitan domination the Jurchen people were part of the state Balhae in Manchuria and northern Korea. The Wanyan tribe that were to lead the resurgence of the Jurchen traced their descent from Goguryeo and referred to Goreyo as `father and mother country'. They had particularly close contacts with the Goryeo court As Liao dominance weakened, Jurchen became more restless and launched raids across the Yalu (Amnok) River .