Tutu Chengcui (吐突承璀; died 820), courtesy name Renzhen (仁貞), was a powerful eunuch of the Chinese Tang dynasty, during the reign of Emperor Xianzong. Background It is not known when Tutu Chengcui was born—or whether he was originally surnamed Tutu, although, as it is known that he was from the Min region (閩, roughly modern Fujian), it would appear doubtful, as Tutu was largely a Xianbei surname. Early in his career as an eunuch, he served at the eastern palace (i.e., the crown prince's palace) and later served as a supervising eunuch at the textile agency (掖庭局, Yiting Ju) within the eunuch bureau (內侍省, Neishi Sheng). It was said that he was dextrous, intelligent, and capable. While he was serving at the Crown Prince's palace, he served under Li Chun the Prince of Guangling, a son of then-crown prince Li Song (who was a son of then-reigning Emperor Dezong). During Emperor Xianzong's reign In 805, Emperor Dezong died, and Li Song became emperor (as Emperor Shunzong), but as Emperor Shunzong was himself severely ill at that point, he yielded the throne to Li Chun later in the year (as Emperor Xianzong). Emperor Xianzong made Tutu Chengcui Neichangshi (內常侍)—the secretary general of the eunuch bureau, serving as the acting head of the eunuch bureau. In 806, Tutu was also made the commander (中尉, Zhongwei) of the Left Shence Army (左神策軍), as well as the director of religious affairs (功德使, Gongdeshi). In 809, one of the key military governors (jiedushi) who had been ruling their circuits in a de facto independent manner—Wang Shizhen the military governor of Chengde Circuit (成德, headquartered in modern Shijiazhuang, Hebei)—died. Wang Shizhen's son Wang Chengzong declared himself acting military governor. In the past, these successions were routinely approved by the imperial government, but Emperor Xianzong, wanting to reassert imperial authority, hesitated in doing so and considered taking the control of Chengde back by force. The chancellor Pei Ji opposed military action, but Tutu volunteered to command an army against Wang Chengzong. Meanwhile, Lu Congshi (盧從史) the military governor of Zhaoyi Circuit (昭義, headquartered in modern Changzhi, Shanxi) wanted imperial favor, and offered, through Tutu, to attack Wang as well, causing Emperor Xianzong to consider military action further. Meanwhile, around the same time, there was an incident where Tutu, in his role as director of religious affairs, remodeled Anguo Temple (安國寺) and, in the process, built a magnificent