Li Fengji
In 823, after Emperor Muzong made Niu Sengru a chancellor, over Li Deyu, who also wanted to be chancellor, Li Deyu believed that it was at Li Fengji's recommendation that Niu was made chancellor over him, and therefore resented both Niu and Li Fengji. (The Song Dynasty historian Sima Guang, the author of the "Zizhi Tongjian", believed that it was because of this resentment that Li Deyu later had his associate Li Yirang (李夷讓), write defamatory remarks about Li Fengji and Li Fengji's associates in the imperial chronicles, which were then adopted into the "Old Book of Tang".)