Yoshimasu Tamenori 吉益爲則 (Chinese: Jíyì Wéizé, 1702–1773), better known by his hào Tōdō 東洞 (Chinese: Dōngdòng — usually given as Yoshimasu Tōdō in Western scholarship). Founder of the Kohōha 古方派 (“Classical Formula school”) of Edo-period Japanese medicine, the dominant indigenous Japanese medical movement of the 18th century. Native of Hiroshima; trained as a physician and practiced in Kyōto from 1737. Doctrinally radical: he rejected the entire JīnYuán speculative apparatus (and with it the Manase-school Goseihō tradition then dominant in Japan), arguing that the only authoritative source for Chinese medicine is Zhāng Zhòngjǐng’s ShānghánJīnguì corpus, and that all medical theory must be re-grounded in the actual clinical formula-substance patterns of the Hàn classics. His pharmacological work Yakuchō 藥徵 (KR3ec077, 1771) is the systematic statement of this position: each substance is zhēng “tested” against its actual use in Zhòngjǐng’s formulae, with later commentarial speculation severely critiqued. His continuator 村井杶 Murai Kin (村井杶) extended the work in the Zoku yakuchō (KR3ec078). The Kohōha was the dominant Japanese medical tradition from the 1770s through to the Meiji-period collapse of traditional medicine. Japanese physician; not in CBDB.