The oldest line of Yōshin-ryū (楊心流?) is probably the school founded by Nakamura Sakyōdayū Yoshikuni around 1610, and is often referred to as Yōshin Koryū (楊心古流?). Nakamura later changed his name to Miura Yōshin (三浦 楊心), and this school may also be referred to as Miura-ryū (三浦流?), or Miura Yōshin-ryū (三浦楊心流?). It is interesting that this line has a historical connection to the Takeda family through the founder's grandfather, Nakamura Yorifusa. Yorifusa was a retainer of the Koshu Takeda who founded a school of jujutsu called Taiyo ryu. Yoshin Koryu was founded by Nakamura Yoshikuni in Nagasaki after being driven from Takeda lands by Tokugawa Ieyasu. It is stated that Yoshin Koryu was a mixture of Taiyo ryu and knowledge gained by Yoshikuni’s exposure to Chinese martial arts and medicine, knowledge gained while living in Nagasaki and in nearby Miura village.
Read more about Yōshin Koryū: History