Su Gui (蘇瓌 or 蘇瑰) (639 – December 18, 710), courtesy name Changrong (昌容) or Tingshuo (廷碩), formally Duke Wenzhen of Xu (許文貞公), was an official of the Chinese dynasty Tang Dynasty and Wu Zetian`s Zhou Dynasty, serving as a chancellor during the reigns of Emperor Zhongzong, Emperor Shang, and Emperor Ruizong. == Background....