Yelü Bei
In 926, Emperor Taizu launched a major attack on Balhae, conquering it. He converted it to a kingdom named Dongdan, creating his and Empress Shulü's oldest son Yelü Bei its king, with the title of "Imperial King of Man" (人皇王, Ren Huangwang) — while their second son Yelü Deguang was, at the same time, given the title of "Generalissimo Crown Prince". It was said that this campaign was conducted with Empress Shulü's strategies.