 In 936, the Later Tang general Shi Jingtang, with military assistance from Emperor Taizong, overthrew then-Later Tang emperor Li Congke and established a new state of Later Jin, subservient to the Khitan.When one of the Later Tang generals that Emperor Taizong captured, Zhao Dejun the military governor of Lulong Circuit (盧龍, headquartered in modern Beijing), was delivered to Empress Dowager Shulü, she pointed out Zhao's hypocrisy in claiming to want to defend the Later Tang emperor while actually engaging in negotiations with Emperor Taizong to have his support for the throne instead.When Zhao offered his properties at Lulong's capital You Prefecture (幽州) to her, she pointed out that Shi, as part of his agreement with Emperor Taizong to cede 16 prefectures to Khitan, had already been ceded to her, and therefore was no longer Zhao's, causing Zhao to be distressed and subsequently dying in Khitan captivity.