Zhang Jianzhi
In 705, Wu Zetian was overthrown in a coup, and her son and crown prince Li Xian, formerly emperor, was restored to the throne (as Emperor Zhongzong). Zhang Yizhi and Zhang Changzong were killed in the coup, and Zheng Yin, as their associate, was demoted to be publics works officer at Xuan Prefecture (宣州, roughly modern Xuancheng, Anhui). Once there, he was accused of receiving bribes, and he fled and secretly returned to the eastern capital Luoyang. Once at Luoyang, he secretly met Emperor Zhongzong's cousin (Wu Zetian's nephew) Wu Sansi the Prince of Liang, who was then a trusted advisor of Emperor Zhongzong and a lover to Emperor Zhongzong's powerful wife Empress Wei and was locked in a power struggle with the leaders of the coup that had returned Emperor Zhongzong to the throne—Zhang Jianzhi, Cui Xuanwei, Huan Yanfan, Jing Hui, and Yuan Shuji. When Zheng first saw Wu Sansi, he cried out loud, and then laughed out loud. Wu Sansi, who was stern in his disposition, was perplexed. Zheng responded: