Kumano Sansho Gongen Nagamitsu

Kumano Sansho Gongen Nagamitsu is a tachi forged by Osafune Nagamitsu, the son of Osafune Mitsutada and one of the foremost swordsmiths of mid-Kamakura Bizen Province. Nagamitsu inherited and developed his father's style, producing masterworks in a wide range across tachi, tanto, and naginata. Many of his works are designated National Treasures or Important Cultural Properties, and his blades stand as canonical reference pieces for Kamakura-period Bizen swordsmanship.

This tachi is dedicated to Kumano Hayatama Taisha in Shingu City, Wakayama Prefecture — one of the three great Kumano shrines (Hongu, Hayatama, and Nachi) — and is designated an Important Cultural Property. The name "Kumano Sansho Gongen" refers to the three enshrined deities of the Kumano Sanzan. Kumano was the most celebrated pilgrimage site of premodern Japan, drawing worshippers from emperors and nobles to warriors and commoners. Warriors customarily dedicated fine swords here, and the sword has been preserved in the shrine's treasure hall (Shinpokan) as a sacred offering.

The blade exhibits the brilliant choji-midare characteristic of Nagamitsu, with precisely packed ko-itame grain, vivid midare-utsuri typical of Bizen work, and the bright, refined nioi-guchi with balanced activity of nie and nioi that defines the Kamakura Bizen ideal. Preserved as a sacred sword away from practical use, it remains an important artifact connecting the Kumano faith with samurai culture.