initially succeed. Meanwhile, in 726, Li Sisheng's title was changed to the Prince of Zhong, and his name was changed to Li Jun. In 728, his own mother Consort Yang Guipin died. In 729, when there was a Khitan and Kumo Xi incursion, Li Jun was put in titular command of the army sent to repel the Khitan and the Xi, with Emperor Xuanzong's second cousin Li Hui () the Prince of Xin'an in actual command of the army. After Li Hui defeated the Khitan and the Xi, Li Jun was nevertheless rewarded with the honorific title of Situ (), one of the Three Ducal Ministers. In 735, his name was changed to Li Yu. In 737, due to the machinations of Consort Wu, Li Ying, along with his brothers Li Yao () the Prince of E and Li Ju () the Prince of Guang, was accused of crimes, deposed, and forced to commit suicide. Consort Wu and Li Linfu continued to lobby for Li Qing (whose name had been changed to Li Mao at this point) to be created crown prince, but with Consort Wu having died herself later in 737 and Emperor Xuanzong believing that Li Yu was capable, he hesitated. At the urging of the eunuch Gao Lishi, who believed that one of his older sons should be made crown prince, Emperor Xuanzong created Li Yu crown prince in 738 and renamed him Li Shao. (As it was quickly pointed out that he thus shared a name with the Liu Song crown prince Liu Shao, who killed his father and usurped the throne, his name was then quickly changed to Li Heng and would not change again thereafter.) One of his consorts, Consort Wei, the sister of the official Wei Jian (), was created crown princess. As crown prince As Li Heng's ascension to be crown prince was against Li Linfu's wishes, and also because Wei Jian, who drew favor from Emperor Xuanzong due to his abilities to increase revenues for the imperial treasury, was becoming a rival to Li Linfu at court, Li Linfu looked for ways to incriminate both Wei and Li Heng. In 746, when the official Yang Shenjin (), at Li Linfu's instigation, reported to Emperor Xuanzong that, one night, Li Heng met Wei while both were sightseeing, and shortly after, Wei met a friend of his, the general Huangfu Weiming () at