Zhang Jianzhi
In spring 705, with Wu Zetian being ill, Huan entered into a plot with a number of officials and generals, including Zhang Jianzhi, Cui Xuanwei, Jing Hui, and Yuan Shuji, to kill Zhang Changzong and his brother Zhang Yizhi, also a lover of Wu Zetian's. Before proceeding, Huan reported this to his mother, and his mother, approving his involvement in the plot, told him, "Where loyalty and filial piety cannot both be satisfied, you should first be faithful to the empire before your obligations to your family." With agreement from Li Xian the Crown Prince (Wu Zetian's son and former emperor), they acted on February 20, killing Zhang Yizhi and Zhang Changzong, and then surrounding Wu Zetian. Wu Zetian ordered Li Xian to return to the crown prince's palace, stating, "It is you. Since now the hoodlums [(i.e., the Zhang brothers, whom the coup leaders were claiming to have designs on the throne)] have died, you can return to the Eastern Palace." However, Huan stepped forward and spoke: