Kagawa Shūan 香川修庵 (1683–1755), prominent early-Edo Japanese physician of Kyōto and one of the early figures of the kohō-ha 古方派 (Ancient-Formula School). A pupil of Itō Jinsai’s 伊藤仁齋 Kogigaku 古義學 Confucian movement before turning to medicine, Kagawa argued for a return to Shānghán lùn clinical practice under the slogan jūshén yīrú 儒醫一如 (“Confucianism and medicine are one”). His principal works include Ippondō kōyo igen 一本堂行餘醫言 and Ippondō yakuxen 一本堂藥選. Referenced in KR3eq001 Téngshì yītán as 衡山先生 (“Kōzan-sensei”), with whom 近藤明 Kondō Akira reports having briefly studied in Kyōto.