Nagata Tokuhon 永田德本 (also styled 知足齋 / Chizoku-sai; traditional dates 1513–1630, almost certainly conflating multiple persons / legendary inflation), semi-legendary wandering physician of late Sengoku / early Edo Japan, native of Kōshū (Kai 甲斐). Patronised by the Takeda house. Renowned in Edo-Japanese clinical tradition for an idiosyncratic nineteen-prescription corpus (Tokuhon jūkyūhō 知足齋德本十九方) recovered by 片倉元周 Katakura Genshū from a Kuroda 黑川 village manuscript and printed in KR3eq053 Qīngnáng suǒtàn with Katakura’s commentary.