 Later in 904, Zhu assassinated Emperor Zhaozong and replaced him with his son Li Zuo the Prince of Hui (as Emperor Ai), and the Tang court came under Zhu's complete control.In 906, Zhu launched a major attack on Liu Shouwen, and Liu Rengong sought aid from Li Keyong.Li Keyong initially refused to aid Liu, but after advice by his son Li Cunxu, who pointed out that if Zhu destroyed the Lius, no one else could stand up against Zhu.