李吉甫
Around new year 806, Zheng Yin was promoted to be "Zhongshu Shilang" (中書侍郎), the deputy head of the legislative bureau, and given the "de facto" chancellor title of "Tong Zhongshu Menxia Pingzhangshi" (同中書門下平章事). It was said, however, that at the time fellow chancellor Du Huangchang, who was advising Emperor Xianzong on reforms, especially the wresting of control back from regional warlords, made most of the decisions, and that Zheng was often silent. There was an occasion after Du left office and was replaced by Li Jifu where Li Jifu secretly accused Zheng of having leaked secrets to the warlord Lu Congshi (盧從史), but the imperial scholar Li Jiang pointed out to Emperor Xianzong the implausibility of the accusation, and Emperor Xianzong agreed and did not act on the accusation. Still, with Emperor Xianzong considering Zheng to be too silent and not doing much as chancellor, in 809 Zheng was removed from his chancellor office and made an advisor to the Crown Prince; Zheng was replaced as chancellor with Li Fan.