Emperor Zhaozong of Tang
Later in 906, Zhu advanced north and again put Liu Shouwen under siege at Cang Prefecture. Liu Rengong sought aid from Li Keyong to try to save Liu Shouwen. Under Li Keyong's demand, Liu Rengong sent troops to join Hedong forces under Li Sizhao and Zhou in attacking Lu Prefecture (潞州, in modern Changzhi, Shanxi), to try to recapture Zhaoyi Circuit (昭義, headquartered at Lu Prefecture). When the joint Hedong/Lulong forces reached Lu Prefecture, Ding Hui, the military governor commissioned by Zhu, who had been mourning Emperor Zhaozong of Tang (whom Zhu had assassinated in 905 and replaced with his son Emperor Ai), surrendered Lu to them.