Chéng Wúyǐ 成無己 (born ca. 1063, fl. into the Jīn Hǎilíngwáng 海陵王 reign of Zhènglóng 正隆 丙子 [1156], when he was over ninety) was a native of Liáoshè 聊攝 (modern Liáochéng 聊城, Shāndōng) — a region that fell under Jīn rule in 1127, making Chéng a Jīn subject in his old age though Sòng-born. He was one of the founders of the JīnYuán “Shānghán-line” of clinical medicine and the first sustained commentator on the Shānghán lùn. His Zhù jiě Shānghán lùn 注解傷寒論 (KR3e0008, in ten juan, completed under the Jīn) became the standard SòngJīn commentary on the Hàn cold-damage canon, supplanted in the Míng only by Fāng Yǒuzhí 方有執’s Tiáobiàn 傷寒論條辨 (1592) and Yú Chāng 喻昌’s Shànglùn piān 尚論篇 — both of which heavily attacked Chéng’s reading. He is also the author of the Shānghán mínglǐ lùn 傷寒明理論 in three juan and the Lùn fāng 論方 in one juan (KR3e0010; appended in some editions to the Shānghán lùn), original treatises elaborating the Shānghán’s diagnostic and prescriptive logic. Yán Qìzhī’s 嚴器之 preface to the Mínglǐ lùn and Zhāng Xiàozhōng’s 張孝忠 bá of Kāixǐ 1 (1205) are the principal early biographical witnesses.