Zhang Jiuling
In 712, Emperor Ruizong passed the throne to Li Longji, who took the throne as Emperor Xuanzong. For some time, though, Emperor Xuanzong did not sacrifice to heaven and earth outside of the capital Chang'an, as was customary for emperors. Zhang Jiuling submitted a petition asking him to carry out such sacrifices, and Emperor Xuanzong, following his advice, did so. In or around 713, he submitted a petition to the chancellor Yao Chong, pointing out the importance of a clean and fair civil service system, and Yao was impressed.