while sending Princess Taiping and her husband Wu Youji the Duke of Chu to Pu Prefecture (蒲州, roughly modern Yuncheng, Shanxi). However, after Princess Taiping found out and objected, the plan was cancelled, and Song and Yao were demoted out of the capital Chang'an. Later in 711, Emperor Ruizong created a daughter of Li Chengqi the Princess Jinshan and offered to marry her to the khan of Eastern Tujue, Ashina Mochuo, or Ashina Mochuo's son Ashina Yangwozhi (阿史那楊我支) (although Princess Jinshan would ultimately not be married to either). Soon thereafter, Li Chengqi resigned the honorific title of Sikong and again served as Li Longji's advisor. In turn, Li Longji offered to yield the crown prince position to Li Chengqi, an offer that Emperor Ruizong again declined. In 712, Emperor Ruizong passed the throne to Li Longji, who took the throne as Emperor Xuanzong, although Emperor Ruizong continued to retain actual and superior power, as Taishang Huang (retired emperor). During Emperor Xuanzong's reign In 713, Emperor Xuanzong, believing that Princess Taiping was about to, along with officials and generals loyal to her, start a coup to overthrow him, acted first, killing officials and generals close to her and then forcing her to commit suicide. Thereafter, Emperor Ruizong transferred full imperial authorities to Emperor Xuanzong, who subsequently conferred on Li Chengqi the honorific titles Kaifu Yitong Sansi (開府儀同三司) and Taiwei (太尉) (also one of the Three Excellencies). It was said that thereafter, Emperor Xuanzong tried to show his love toward his brothers—Li Chengqi, Li Chengyi (李成義) the Prince of Shen, Li Fan (李範) the Prince of Qi, Li Ye (李業) the Prince of Xue—as well as his cousin Li Shouli, who was raised with them, established rooms for them inside the palace to allow them to stay overnight whenever they wished. Emperor Xuanzong and the five princes often spent time together in various activities—discussing Confucian classics, writing poetry, drinking, gambling, gaming, hunting, and playing music (and Li Chengqi, in particular, was known for playing the di and jiegu). Li Chengqi was praised for being humble and careful, and Emperor Xuanzong was therefore respectful and trusting of him. Nevertheless, the officials were concerned that Li Chengqi, Li Shouli, and Li Chengyi (who was also older than Emperor Xuanzong) would become centers of conspiracies, and therefore requested that they be sent out of the capital to be prefects. In 714, Emperor Xuanzong agreed and