Zhang Jiazhen (張嘉貞) (666 – September 19, 729), formally Marquess Gongsu of Hedong (河東恭肅侯), was an official of the Chinese Tang Dynasty and Wu Zetian's Zhou Dynasty, serving as a chancellor during the reign of Emperor Xuanzong of Tang. During Emperor Xuanzong's reign, he also served as a general. He was known for being capable but also being self-important during his term as chancellor.
Read more about Zhang Jiazhen: Background, During Emperor Xuanzong's Reign