Wu Zetian place of burial Qianling Mausoleum
In winter 704, Wu Zetian became seriously ill for a period, and only the Zhang brothers were allowed to see her; the chancellors were not. This led to speculation that Zhang Yizhi and Zhang Changzong were plotting to take over the throne, and there were repeated accusations of treason. Once her condition improved, Cui Xuanwei advocated that only Li Xian and Li Dan be allowed to attend to her—a suggestion she did not accept. After further accusations against the Zhang brothers by Huan and Song Jing, Wu allowed Song to investigate, but before the investigation was completed, she issued a pardon for Zhang Yizhi, derailing Song's investigation.By spring 705, Wu was seriously ill again. Zhang Jianzhi, Jing Hui, and Yuan Shuji planned a coup to kill the Zhang brothers. They convinced the generals Li Duozuo, Li Dan (李湛, note different character than the former emperor), and Yang Yuanyan (楊元琰) and another chancellor, Yao Yuanzhi, to be involved. With agreement from Li Xian as well, they acted on 20 February, killing Zhang Yizhi and Zhang Changzong, and had Changsheng Hall (長生殿), where Wu was residing, surrounded. They then reported to her that the Zhang brothers had been executed for treason, and forced her to yield the throne to Li Xian. On 21 February, an edict was issued in her name that made Li Xian regent, and on 22 February, an edict was issued in her name passing the throne to him. On 23 February, Li Xian formally retook the throne, and the next day, under heavy guard, Wu was moved to the subsidiary palace, Shangyang Palace (上陽宮), while still honored with the title of Empress Regent Zetian Dasheng (則天大聖皇帝). On 3 March, the Tang dynasty was restored, ending the Zhou.Wu died on 16 December, and, pursuant to a final edict issued in her name, was no longer called empress regnant, but instead "Empress Consort Zetian Dasheng" (則天大聖皇后). In 706, Wu's son Emperor Zhongzong had Wu interred in a joint burial with his father, Emperor Gaozong, at the Qianling Mausoleum, near the capital Chang'an on Mount Liang. Zhongzong also buried at Qianling his brother Li Xián, son Li Chongrun, and daughter Li Xianhui (李仙蕙) the Lady Yongtai (posthumously honored as the Princess Yongtai)—victims of Wu's wrath.
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