Li Chongjun
In 707, Li Chongjun, who was not born of Emperor Zhongzong's powerful wife Empress Wei (her only son Li Chongrun having been killed by Wu Zetian), was angry that Empress Wei's daughter Li Guo'er the Princess Anle and her husband Wu Chongxun (武崇訓, Wu Sansi's son) repeatedly insulted him and were trying to persuade Emperor Zhongzong to create Li Guo'er crown princess to displace Li Chongjun, rose in rebellion and killed Wu Sansi and Wu Chongxun. His subsequent attack on the palace, however, was repelled, and he was killed in flight. Some of his followers implicated Li Dan and Princess Taiping after they were arrested and interrogated. Emperor Zhongzong initially had the imperial censor Xiao Zhizhong put in charge of investigating Li Dan and Princess Taiping, but at Xiao's earnest urging stopped the investigation.