Yelü Bei
After conquering the Dan Gur (Balhae in Khitan language) in 926, the Khitan crown prince Yelü Bei ascended to the throne of it at the Huhan fortress, the capital of Balhae, today's Mudanjiang, Heilongjiang Province. It used Dongdan as its Chinese name, which means the east Dan Gur, in respect to the Liao dynasty in the west.