Dae Inseon

Dae Inseon was king of Balhae, (906 – 926) a kingdom in northeast Asia occupying parts of Manchuria, northern Korea, and the Russian Far East. Dae Inseon was also the last king of Balhae. He and his armies were pushed back and eventually defeated by the Khitan.
Last moment
His times lied in the rapid point of changing. In case of Silla, lots of nobles started to refusing to follow superiors' and rebels gathered all over the territories. Additionally, Tang faced serious crisis which was caused by An Lushan and several peasants. Then, Zhu Wen took the foremost position and established Later Liang.
Ae concentrated all the way for enhancing defensive strength against new superpowers and came to urge new brotherhood - Goryeo Dynasty. However, the outcome was not strong because of continuous conflict among the nobles who just looked for the next thrones eagerly.
But the real matter was the Khitans growing numerous power of Manchuria. The Khitans established...