"With a Pure Heart" : Terao Naomasa, samurai of the early 17. century, and his katana

An exciting search for traces of the provenance of a katana from the Taima-school, which was forged in the early 14th century. Three hundred years later, it came into the possession of Terao Naomasa, a high-ranking samurai and vassal of Tokugawa Yoshinao, the first lord of Owari.