 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.Soon after conquering Balhae, Emperor Taizu died.