Zhang Renyuan (張仁愿) (died 714), né Zhang Rendan (張仁亶), formally the Duke of Han (韓公), was an official and general of the Chinese dynasty Tang Dynasty and Wu Zetian's Zhou Dynasty, serving as a chancellor during the reigns of Wu Zetian's sons Emperor Zhongzong and Emperor Ruizong and grandson Emperor Shang.
Read more about Zhang Renyuan: Background, During Wu Zetian's Reign, During Emperor Zhongzong's Second Reign, During Emperor Shang's Reign, Emperor Ruizong's Second Reign, and Emperor Xuanzong's Reign