Dae Inseon (r. 906–926) was the last king of Balhae, a kingdom in northeast Asia occupying parts of Manchuria, northern Korea, and the Russian Far East.
Dae concentrated on increasing defense capabilities against the threat of new powers and was in favor of allying with the Goryeo dynasty.
In 926, Balhae came to an end, some of the nobles were moved to the Khitan proper by the Liao dynasty, while many of its populace including many of the nobility fled to Goryeo.
[1] The Khitans established the Dongdan Kingdom on the former territories of Balhae, which was ruled by crown prince Yelü Bei.
Dae Inseon likely served in high positions during Yelü Bei's rule and possibly shared power with the latter.