Yán Qìzhī 嚴器之 (fl. mid-12th c., 金), friend and disciple of 成無己 Chéng Wúyǐ, author of the principal supporting preface to Chéng’s Zhù jiě Shānghán lùn 註解傷寒論 (KR3ef005), dated Shàoxīng 紹興 16 (1146). His preface is the chief biographical source on Chéng.