Shakudo Torinikubi Tachi Sword (inscribed "Masanaga" with

Akagane Karasu-kubi Tachi (Signed Sanenaga, with Mounting): A Bizen Osafune Masterpiece at Nokami Hachimangu

Tucked into the wooded hills of inland Wakayama, the venerable shrine of Nokami Hachimangu safeguards a sword of extraordinary historical and artistic importance. The "Akagane Karasu-kubi Tachi, signed Sanenaga, with mounting" (赤銅烏頸太刀〈銘真長／拵付〉) is an Important Cultural Property of Japan—one of the surviving works of Sanenaga, a Kamakura-period master ranked among the famed "Three Masters of Osafune." For visitors interested in samurai history, sacred swordcraft, or the deep cultural fabric of rural Japan, this rarely-seen treasure is one of Wakayama's hidden jewels.

About the Sword and Its Designation

The sword is a tachi—a long, gracefully curved blade designed in the age of mounted warfare to be worn edge-down at the warrior's hip. The full designation refers to three things together: the blade itself, signed with the smith's name "Sanenaga" (真長); its tachi-style mounting (koshirae); and the shakudō-decorated metal fittings, including the distinctive "karasu-kubi" (raven-neck) shape of the tsuka pommel that gives the sword its formal name. Akagane here refers to shakudō, a refined alloy of copper and a small percentage of gold, treated to develop a deep, purplish-black patina prized in Japanese metalwork.

Designation as an Important Cultural Property under Japan's Cultural Properties Protection Law recognizes objects of outstanding historical or artistic value. What makes this sword especially noteworthy is that the blade and its period mounting have survived together as a single ensemble—a rare circumstance for swords of this antiquity, since most medieval blades have been re-mounted, shortened, or separated from their original fittings over the centuries.

The Smith Sanenaga and the Bizen Osafune School

Sanenaga worked in the late thirteenth and early fourteenth centuries in the village of Osafune in Bizen Province (today's Setouchi City, Okayama Prefecture). Bizen was Japan's preeminent sword-producing region, blessed with iron-rich satetsu sand and a long lineage of master smiths. The Osafune school (長船派) is regarded as the largest and most influential lineage in the entire history of Japanese swordmaking.

One of the "Three Masters of Osafune"

Within the school's pantheon, Sanenaga is grouped with Nagamitsu and Kagemitsu as the "Three Masters of Osafune" (長船三作). All three excelled at the most technically demanding feat in sword-forging: properly extending the hardened temper line into the kissaki (point) of the blade, a feature collectively known as the "Three Masters' boshi" (三作帽子). Sanenaga is variously described as Nagamitsu's younger brother or a senior disciple; whichever the case, his mature work occupies a place of honor in any survey of Kamakura-period swordcraft.

The Sanenaga Style

Compared with Nagamitsu's bolder, more robust tachi, Sanenaga's blades are renowned for a quieter dignity. They tend toward a calm, well-balanced silhouette with a shallow curve, a subdued hamon based on the straight suguha pattern with gentle small undulations, and a finely worked steel surface (jigane) often described as having a serene, blue-black depth. Connoisseurs prize this restrained aesthetic for its sense of inner strength and refinement—qualities that align beautifully with the contemplative atmosphere of the shrine that has preserved it.

Why This Sword Was Designated an Important Cultural Property

Several factors converge to give this work its exceptional status. First is the certainty of authorship: the blade carries Sanenaga's signature on the tang, an attribution rarely available with such confidence for swords of this age. Second is the artistic quality of the blade itself, exemplifying the Sanenaga style at its most refined. Third is the survival of the original tachi mounting with its shakudō fittings—an irreplaceable record of how high-status medieval swords were actually dressed and worn. Finally, there is the sword's continuous history as a sacred offering at Nokami Hachimangu, where it has been treasured for centuries as a votive treasure of the deity.

Highlights to Appreciate

The Blade

When the sword is publicly displayed, attentive visitors can observe the elegantly curved silhouette characteristic of Kamakura tachi, the subtle play of the hamon temper line along the cutting edge, and the soft, watery patterning of the steel surface. The signature "真長" cut into the tang is the smith's own hand reaching across more than seven centuries.

The Shakudō Fittings

The mounting takes its formal name from the karasu-kubi (raven-neck) profile of the tsuka pommel and the use of shakudō for the metalwork. Shakudō's distinctive deep, dark sheen—neither true black nor true purple—was achieved by skilled metalworkers using a centuries-old patination process and signaled high status. The combination of austere surfaces and refined details makes this an important reference object in the study of medieval Japanese sword fittings.

The Setting

Half the wonder of this artifact lies in the shrine that has cared for it. Nokami Hachimangu's main hall, worship hall, and three subsidiary shrine halls are themselves nationally designated Important Cultural Properties, dating from the Muromachi and Momoyama periods. To encounter Sanenaga's tachi within this living architectural ensemble is to feel the layered continuity of Japanese sacred culture.

About Nokami Hachimangu Shrine

According to shrine tradition, Nokami Hachimangu's origins reach back to the sixth century, when the Hachiman deity was invited from Yamato Province to this site. In 987, the shrine became a branch of the great Iwashimizu Hachimangu near Kyoto, and it grew into a major regional center. Its medieval buildings were destroyed in 1541 by warriors of nearby Negoro-ji temple, but the dedicated abbot Shinken began a reconstruction in 1557 that produced the buildings still standing today. Asano Yoshinaga and the Tokugawa lords of the Kishu domain later patronized the shrine, leaving inscribed plaques, lanterns, and other offerings still visible on the grounds.

Visitor Information

The shrine grounds are open year-round and free to enter. The treasured sword is not on permanent display; it is shown only on special occasions, so visitors hoping to see it should contact the shrine office in advance. The shrine periodically holds a treasure exhibition (宝物展示) around the spring festival in late April and early May, which is the most reliable opportunity to view shrine artifacts.

Access

From JR Kainan Station on the Kisei Main Line, take the Daiju Bus toward Nogami; the Nokami Hachimangu stop is right at the shrine entrance (about 20 minutes). By car, it is roughly fifteen minutes from the Kainan or Kainan-Higashi interchange of the Hanwa Expressway via the Sakai Bypass on Route 370. A small parking lot (four to five spaces) is available beside the shrine.

Around Nokami Hachimangu

The town of Kimino offers a quietly beautiful slice of inland Wakayama. Visitors can combine their visit with the riverside scenery of the Kishigawa valley, the pottery and craft workshops dotted around the area, the seasonal persimmon and citrus orchards for which the region is famous, and the panoramic susuki (silver grass) plateau of Mount Oishi (Oishi Kogen). Within an easy drive lie the historic temples of Kainan—Chohoji and Zenfukuin among them, both holding National Treasure halls—and Wakayama City with its castle and Kishu Toshogu Shrine.