Cháo Yuánfāng 巢元方 (fl. Suí Dàyè 大業 reign, 605–618), Suí imperial physician with the title Tàiyī bóshì 太醫博士 (Erudite of the Imperial Medical Academy), and the editor — by imperial commission of Emperor Yángdì 煬帝 — of the Zhū bìng yuánhòu lùn 諸病源候論 in fifty juan (KR3e0012), the foundational Chinese pathology treatise. The work, completed ca. 610, organizes the symptom-patterns and disease-aetiologies of more than 1,720 conditions into 67 mén (gates) and is the principal Sòng校正醫書局-era reference for clinical pathology, alongside the Sùwèn, Língshū, Shānghán lùn, and Mài jīng. Cháo’s name appears as the principal compiler in the Sòng Sòng shǐ yìwén zhì and in the Xīn Tángshū yìwén zhì (alongside a separate listing under Wú Jǐng[xián] 吳景[賢] for what is in fact the same work). The SKQS editors infer that the Sòng yīn attribution to “Wú Jǐngxián” reflects Wú’s role as 監修 (supervising compiler) and Cháo’s as 編撰 (chief editor) on a single imperial-bureau project. Beyond his role on this work, Cháo has no transmitted biographical record.