Balhae

State · 705–925 CE · at its largest around 911 CE

A kingdom founded by Dae Jo-yeong in Manchuria and northern Korea, claiming the legacy of Goguryeo. The Khitan Liao destroyed it in 926.

On its lands while it lasted

Balhae (698–926 CE): Kingdom founded by the former Goguryeo general Dae Jo-yeong in Manchuria and northern Korea.
Shangjing Longquanfu (c. 756–785 CE): Capital of Balhae (756–785).