Ren Huan
In 926, Li Cunxu was killed in a mutiny at then-capital Luoyang. His adoptive brother Li Siyuan, who had previously rebelled against him, arrived at Luoyang shortly after and became emperor. Shortly after, the general Ren Huan returned from a campaign against Former Shu, and was expected to be made chancellor. Li Siyuan's chief of staff An Chonghui, not wanting Ren to serve as chancellor alone, sought to have someone else serve with Ren. An's close associate Kong Xun recommended Zheng, claiming that during Zheng's service as Later Liang chancellor, he was cautious and lenient, capable of writing, and capable of judging character. An thus recommended Zheng to Li Siyuan. Subsequent, Li Siyuan made Ren and Zheng chancellors.