Tokugawa Yoshimune
Tokugawa Yorinobu, head of the Kishu Han (modern day Wakayama Prefecture) had heard about Jushin and after meeting him Jushin was asked to be a permanent guest of the Han at Wakayama castle and teach Sekiguchi-ryū. From there the art spread all the way to Edo Tokugawa where the 8th Tokugawa "shōgun", Tokugawa Yoshimune, became a menkyo kaiden of Sekiguchi Ryu.