It is said that the family was originally from Yoshida-mura, Inugami-gun, Oe Province, and during the mid-Muromachi Period his ancestor went to the capital (Kyoto) and served as an in-house doctor of the Muromachi bakufu.
もともとは近江国犬上郡吉田村出身とされ、室町時代中期に上洛し室町幕府お抱えの医者としてつとめた。