account of this, she had Princess Zhao accused of crimes and put into solitary confinement at the bureau of eunuchs. She was given raw vegetables and raw meat for her to cook them herself. However, sometime later, the kitchen stopped to have smoke and steam come out of it, and when Empress Wu had her confinement house opened, Princess Zhao was seen dead inside, having starved to death. Empress Wu also demoted Zhao Gui to be the prefect of Kuo Prefecture (括州, roughly modern Lishui, Zhejiang) and ordered Princess Changle to accompany her husband to Kuo Prefecture, and further ordered that neither Zhao Gui nor Princess Changle would be allowed to enter the palace. In 676, when the Tibetan Empire attacked Tang's western prefectures, Li Xiǎn and his younger brother Li Lun, the Prince of Xiang, were nominally put in charge of the two armies that were actually commanded by the generals Liu Shenli () and Qibi Heli (), but neither Li Xiǎn nor Li Lun actually set out with the troops. In 677, Li Xiǎn had his title changed to Prince of Ying. His name was also changed to Li Zhe. He was also made the prefect of the capital prefecture Yong Prefecture (雍州, roughly modern Xi'an, Shaanxi). By 680, Li Xián, who was then crown prince, had lost Empress Wu's favor. After she suspected him of having had her trusted sorcerer Ming Chongyan () assassinated, she had him investigated for treason, and subsequently, he was found guilty. He was reduced to commoner rank and exiled, and Li Zhe was created crown prince to replace him. Hao Chujun and another chancellor, Liu Rengui, were made his senior advisors. Emperor Gaozong also recruited the famed hermit scholar Tian Youyan () to serve as an advisor, although Tian would later draw criticism from others for not having any actual good advice for the crown prince. First stint as crown prince In 681, after Emperor Gaozong had become ill after consuming pills made by alchemists, Empress Wu rarely allowed anyone to meet with Emperor Gaozong, and all important matters were resolved in the Central Palace (the residence of the empresses), he had Li Zhe briefly exercise imperial powers, also, the chancellors aligned with Empress Wu were also responsible for helping him. In 682, Li Zhe's second wife, Crown Princess Wei, gave birth to a son, Li Chongzhao. Emperor Gaozong was pleased, and