Tachi Sword (inscribed Yasutsuna)

A Sword from the Dawn of the Japanese Blade

The signature cut into the tang reads a single word: Yasutsuna. It belongs to a smith who worked in Hōki province, the western part of present-day Tottori Prefecture, during the late Heian period in the twelfth century. Yasutsuna is counted among the earliest named swordsmiths in Japan, and this tachi survives as one of the oldest signed examples of the curved single-edged blade that the world now recognises as the Japanese sword.

The blade measures roughly 80.6 centimetres along the cutting edge, with a gentle curve. Its outline still carries the slender, deeply waisted elegance of early Heian work, the moment when the straight blades of antiquity gave way to the graceful arc designed for cutting from horseback. The temper line, or hamon, runs as a broad straight pattern called hiro-suguha, restrained and quiet rather than flamboyant, with a long groove carved along the body that fades out toward the point.

The sword is held by Kishū Tōshōgū, the Tokugawa shrine in the city of Wakayama, and is normally kept on deposit at the Wakayama Prefectural Museum rather than at the shrine itself.

Why It Matters

Yasutsuna stands at the headwaters of Japanese sword history. Tradition names him, alongside Sanjō Munechika of Kyoto and the early Bizen smiths, among the first masters to sign their work, and he is famous as the maker of the celebrated blade Dōjigiri. To hold a signed Yasutsuna is to hold a record of the very years when the form of the Japanese sword was settling into the shape it would keep for the next eight centuries.

The blade was designated an Important Cultural Property in 1913. What lifts it beyond rarity alone is its documented connection to the Tokugawa house. Tokugawa Yorinobu, tenth son of Ieyasu and founding lord of the Kii domain, acquired this ancient tachi and presented it to Kishū Tōshōgū. Records preserved by the Miura family, senior retainers of the domain, place the dedication at the Waka Matsuri festival of 1665, the year of the fiftieth memorial of Ieyasu's death. The accompanying scabbard mounting, an itomaki no tachi style listed as an attached property, is decorated with scattered hollyhock crests, the emblem of the Tokugawa, in gold lacquer and dark shakudō fittings.

What to Look For

Because the sword lives in museum keeping, the chance to see it comes during special exhibitions. The Wakayama Prefectural Museum gathered the Kishū Tōshōgū blades for a dedicated show in 2024, and the shrine's swords reappear periodically in themed displays there.

When the blade is on view, look first at its silhouette. The narrow body and shallow curve speak of an age before the broad, dramatic blades of the later Kamakura period. Then study the surface steel, where a faint, cloudlike grain rewards patient looking under raking light. The quiet temper line is easy to overlook beside showier later work, yet that very reticence is the signature of the oldest school.

A visit to Kishū Tōshōgū itself is worth pairing with any sword-hunting. The shrine sits above Wakanoura bay, reached by a steep flight of 108 stone steps known as the Samurai Slope. Its lavishly carved and painted halls, finished in 1621, earned it the nickname the Nikkō of the West. The grounds are free to enter; the inner shrine carries an admission charge.