 His remains were buried at Sangen-in, a sub-temple of the Daitoku-ji, Kyoto.A theory / legend says that Ieyasu showed him mercy, but hid him, for political reasons, with one of his veteran generals, Sakakibara Yasumasa, where he grew old and died a natural death.To thank Yasumasa for his silence, Mitsunari gave him a treasured "sunnobi-tantō" of 31,2 cm therefore nicknamed "Ishida-Sadamune" (石田貞宗), ranked "Jūyō Bunkazai" by the Japanese Government.