The lucky sword of Tokugawa Ieyasu. It was smithed by Sadamune Hikoshiro, the adoptive son of Masamune the swordsmith (note: not to be confused with Masamune Date). Its name, “Monoyoshi”, means ‘good thing’; due to whenever it was brought to battle, Ieyasu would always win. After Ieyasu’s death, one of his concubine, Kame, stole the sword and gave it to her son, Yoshinao, despite the sword originally should be handed down to Hidetada, Tokugawa’s third son.
The sword now resides in Tokugawa Art Museum in Nagoya.