Zheng Kewen is an author whose life and official career are very poorly documented in publicly available sources. His only known extant work is the single compiled volume Zhe Yu Gui Jian (A Mirror for Deciding Cases), usually classified under culture. Also known as Jue Yu Gui Jian, the book is an important ancient Chinese compilation of legal cases and forensic writings, drawing on historical records, notebooks, and case reports across the dynasties. It arranges difficult cases by category, recording how they were tried and reasoned through, in a concise style that stresses the analysis of doubt rather than empty argument. Many entries concern the checking of physical evidence, on-site investigation, and the comparison of testimony, showing a balanced regard for empirical proof and human circumstance. The work long served as a reference for later legal scholars and case handlers and has had a lasting influence on traditional legal culture and crime-case narrative. Because other details of Zheng Kewen's life are unrecorded, his fuller profile awaits further historical research.
