Tachibana Nankei 橘南谿 (sinicized Jú Nánxī, 1753–1805), original surname Miyakawa 宮川, given name 春暉 (Haruteru); his physician name 橘元亮 (Tachibana Genryō) and hào 南谿 (Nankei) are the forms by which he is universally known. A native of Ise 伊勢 (modern Mie prefecture), Nankei studied medicine in Kyōto under Yoshimasu Tōdō 吉益東洞 and Ogino Gengai 荻野元凱, and practiced in Kyōto for most of his career. He is best known not for his medical works but for his two travel collections, Saiyū-ki 西遊記 (Western journey, 1795) and Tōyū-ki 東遊記 (Eastern journey, 1797), which are foundational documents of late-Edo travel literature and one of the most-cited primary sources for the social and intellectual history of late-eighteenth-century Japan. His medical writing is less voluminous but includes the Shōkanron kōyō 傷寒論綱要 (a clinically organized digest of the Shānghán lùn) and several case-records. Nankei died in Bunka 2 = 1805.