Li Chongjun
In 707, Emperor Zhongzong's son Li Chongjun the Crown Prince, born of a concubine, was angry at insults repeatedly thrown at him by his sister Li Guo'er the Princess Anle and her husband Wu Chongxun (武崇訓, Wu Sansi's son) and Li Guo'er's repeated attempts to become crown princess to displace him. He rose in rebellion and killed Wu Sansi and Wu Chongxun and then marched on to the palace, seeking to arrest Empress Wei, Li Guo'er, and another concubine of Emperor Zhongzong's, Consort Shangguan Wan'er, who also had an affair with Wu Sansi, but was soon defeated and killed in flight. In the aftermath of Li Chongjun's rebellion, there were investigations into anyone who might have conspired with Li Chongjun. The chancellors Zong Chuke and Ji Chuna, aligned with Empress Wei, had the censor Ran Zuyong (冉祖雍) accuse Emperor Zhongzong's brother Li Dan the Prince of Xiang and sister Princess Taiping of having conspired with Li Chongjun. Emperor Zhongzong requested Xiao to investigate, but Xiao, weeping, responded: