Zheng Dangshi 鄭當時, courtesy name Zheng Zhuang 鄭莊, was an official during the mid-Former Han period 前漢 (206 BCE-8 CE). He came from Chen 陳 (modern Huaiyang 淮陽, Henan) and was famous along the Yangtse river as a so-called wandering knight (youxia 遊俠). During the reign of Emperor Jing 漢景帝 (r. 157-141 BCE) he became a retainer of the Crown Prince and rose to the post of governor (taishou 太守) of Jinan 濟南. He also was counselor to the Prince of Jiangdu 江都 and later became Right Chamberlain for the Capital (you neishi 右內史) and Chamberlain for the National Treasury (da sinong 大司農). Zheng Dangshi was honest and incorruptible in his office and treated the rich and and the poor equally fair. He made use of competent advisors. As an adherent of the Huang-Lao school of thought 黃老 he preferred a non-active, benevolent and peaceful government. He died as governor of Runan 汝南. Sources: Cang Xiuliang 倉修良 (1991). Shiji cidian 史記辭典, p. 718. Jinan: Shandong jiaoyu chubanshe. Cang Xiuliang 倉修良 (1996). Hanshu cidian 漢書辭典, p. 992. Jinan: Shandong jiaoyu chubanshe.