Zhang Ou 張歐, courtesy name Zhang Shu 張叔, was a high minister of the early Former Han period 前漢 (206 BC-8 CE). He was a son of Zhang Yue/Shuo 張說, Marquis of Anqiu 安丘侯. Famous for his expertise in penal law, he was made a servant of crown prince Liu Qi 劉啓, the future Emperor Jing 漢景帝 (r. 157-141 BCE). Acceeded to the throne, Liu Qi made him one of the Nine Chamberlains (jiuqing 九卿). In 140 he wa appointed Commandant of the capital (zhongwei 中尉), in 131 to the post of Censor-in-chief (yushi dafu 御史大夫). Zhang Ou was known for his rightenousness and fairness. Emperor Wu highly esteemed him, and after Zhang Ou retired, the emperor granted him the income of a Senior Grand Master (shang dafu 上大夫). Sources: Cang Xiuliang 倉修良 (1996). Hanshu cidian 漢書辭典, p. 682. Jinan: Shandong jiaoyu chubanshe. Cang Xiuliang 倉修良 (1991). Shiji cidian 史記辭典, p. 504. Jinan: Shandong jiaoyu chubanshe.