The Yagyu Code: Yagyu Jubei Kills Fifty Men

Seven years after Tokugawa Iemitsu was proclaimed the third shogun, the shogunate introduced a new sankin-kotai system to all feudal lords across the country and also strengthened measures to eliminate outside lords. Naturally, the outside lords strongly opposed this, and Shimazu Yoshihiro, the lord of the Satsuma domain, did not hesitate to criticize them. Shimazu then concluded that the Yagyu Bugeicho, which had been compiled by Tajima's father, Yagyu Sekishusai, on Ieyasu's top-secret orders, was the root cause of the efforts to eliminate the outside lords and demanded that it be destroyed. The shogunate rejected the request, but soon efforts to target the Yagyu Bugeicho became more active.