and major general, but he continued to also serve as prefect of Yong Prefecture. At this time, he had the literarily talented official Wang Bo on staff. Around this time, the princes were apparently often engaged in cockfighting. Wang Bo wrote a playful piece entitled the Declaration Against the Prince of Zhou's Cock (檄周王雞文) (the Prince of Zhou was Li Xian's brother Li Xiǎn (note different tone), later named Li Zhe), which, however, when Emperor Gaozong read it, caused Emperor Gaozong to be angry, as he believed this would cause discord between his sons, and therefore expelled Wang from the Pei mansion. In 672, Li Xian's title was changed to Prince of Yong, and he was given the titles of commandant at Liang Prefecture (涼州, roughly modern Wuwei, Gansu), but continued to also serve as general and prefect of Yong Prefecture. His name was also changed to Li De. In 674, his name was changed back to Li Xian. As crown prince In 675, Li Xian's older brother Li Hong the crown prince died—a death that traditional historians generally believed to be a poisoning ordered by Empress Wu. On July 3, Li Xian was created crown prince to replace Li Hong. Emperor Gaozong soon ordered that much of government matters be ruled on by Li Xian, But because most of the imperial work was done by Empress Wu, his decisions were under her mother's control. But Li Xian was praised for making good decisions. Also around this time, Li Xian led a group of scholars, including Zhang Da'an, Liu Nayan (劉訥言), Ge Xiyuan (格希元), Xu Shuya (許叔牙), Cheng Xuanyi (成玄一), Shi Cangzhu (史藏諸), and Zhou Baoning (周寶寧), in writing commentaries for the Book of Later Han, the official history of the Eastern Han Dynasty, written by the Liu Song scholar Fan Ye. Meanwhile, Li Xian's relationship with Empress Wu began to deteriorate, as Li Xian had heard the rumors that he was actually the son of Lady of Han, and had become fearful. Empress Wu, detecting this, had her literary staff write two works entitled, Good Examples for Shaoyang (少陽正範, "Shaoyang" being an oblique term for a crown prince) and Biographies of Filial Sons (孝子傳) and gave them to Li Xian, and further wrote a number of letters rebuking Li Xian, making him more fearful. At the same time, Empress Wu relieved his duties as head of many government decisions