Sword (inscribed Kumano Sansho Gongen Nagamitsu)

A Sword That Names Its Gods

On the tang of this tachi, hidden beneath the hilt when the sword is mounted, a fine chisel has cut six characters: Kumano Sansho Gongen. On the other side, two more: Nagamitsu. The first is a dedication to the three principal deities of the Kumano shrines, the great pilgrimage sanctuaries of the Kii Peninsula. The second is the signature of one of the most celebrated swordsmiths of thirteenth-century Japan.

A blade signed with the name of its maker is common enough. A blade signed with the names of gods is something else entirely, and this inscription is the reason the sword carries the formal designation Tachi, signed Kumano Sansho Gongen Nagamitsu. It was recognized as a National Treasure under Japan's Cultural Property Protection Law on November 22, 1952, having earlier been designated under the prewar system on January 19, 1931. Today it belongs to a private owner in Osaka Prefecture.

The blade measures 75.0 centimeters along its cutting edge, with a curvature of 2.9 centimeters that sits low, near the hilt. This deep koshizori curve, strongest where the blade meets the hand, is a hallmark of the classic tachi, the long sword worn slung edge-down from the belt of a mounted warrior.

Nagamitsu and the Osafune School

Nagamitsu worked in Osafune, a village on the Yoshii River in Bizen Province, now part of Setouchi City in Okayama Prefecture. He is regarded as the second master of the Osafune school and the son of its founder, Mitsutada. Under these two men, Osafune grew into the most productive center of sword manufacture in medieval Japan.

The numbers alone suggest his standing. Six works by Nagamitsu hold National Treasure status, five tachi and one naginata, and more than thirty others are designated Important Cultural Properties. No other individual smith approaches that count.

His career also traced an arc. Early works echo the flamboyant, clove-blossom temper patterns of his father; later pieces settle into quieter, more disciplined lines. This sword is generally placed in his earlier to middle period, when the exuberance had begun to tighten into control.

Why Kumano? The inscription is read as evidence of the smith's own devotion to the Kumano deities, a point the Agency for Cultural Affairs notes in its official commentary. One tradition, related by the foundation involved in the sword's preservation, holds that the blade was forged for goma fire rituals performed by the imperial court to repel the Mongol invasions of 1274 and 1281, and was afterward dedicated to a Kumano shrine. The dating is plausible, since Nagamitsu was active in precisely those decades, though the story itself cannot be verified and is best read as transmitted legend rather than documented fact.

Why It Is a National Treasure

Two qualities anchor the designation: the workmanship and the state of preservation.

The official record describes a blade of shinogi-zukuri construction with an iori-mune ridged back, pronounced flare at the base, and a small point section measuring 3.0 centimeters. The steel surface shows a tightly knit small wood-grain forging pattern, ko-itame, across which rises a vivid midare-utsuri, a misty shadow reflection that floats above the temper line when the blade is angled toward light. Utsuri of this clarity is a signature achievement of Kamakura-period Bizen smiths, and one that later generations struggled to reproduce.

The hamon, the crystalline temper line along the edge, runs in choji-midare, an irregular clove-blossom pattern, with occasional gunome half-circles mixed in. Its outline is firmly compressed rather than billowing, yet the interior is alive with ashi and yo, streaks and isolated points of hardened steel that reach down toward the edge. The Agency's assessment singles out exactly this combination: a contained outline concealing intense activity within.

Then there is the tang. At 21.2 centimeters, it is ubu, completely unaltered since the day it left the forge, ending in a chestnut-shaped kurijiri tip with two mekugi holes and file marks slanting in the katte-sagari manner. Countless tachi of this era were shortened in later centuries to suit changing fashions of wear, a process that destroyed signatures and dedications alike. That this blade kept its original tang, and with it the rare votive inscription, makes it both an artwork and a document of Kamakura-period religious life.

Seven Centuries of Owners

Few swords can match this one for the company it has kept. The transmitted provenance, assembled from Edo-period records and modern research, reads like a roll call of Japanese history.

From a Kumano shrine the sword is said to have passed to the Kuki family, a seafaring clan of the Kumano coast whose fleet later became famous as the Kuki navy. When the Kuki entered the service of Oda Nobunaga in the 1570s, reportedly through the mediation of his retainer Takigawa Kazumasu, the blade was presented to Nobunaga himself.

After Nobunaga's death in 1582 it passed to Toyotomi Hideyoshi, and from Hideyoshi to the daimyo Uesugi Kagekatsu. A sword mounting in the Tensho Uesugi style that accompanies the blade is thought to date from this period. Following the Battle of Sekigahara in 1600, the Uesugi house, reduced and seeking reconciliation with the new order, is believed to have presented the sword to the Tokugawa, in whose shogunal collection it remained for over a century.

The next transfer is firmly documented. In 1717, the eighth shogun Tokugawa Yoshimune bestowed the blade on Kuchiki Tanemoto, second lord of the Fukuchiyama domain, as a reward for his service as magistrate of temples and shrines. An appraisal certificate valuing the sword at eight gold pieces was issued at the time through the Hon'ami family, the hereditary sword appraisers of the shogunate.

The Kuchiki kept it until the modern era, when it passed to Viscount Hosokawa Toshibumi, under whose name the 1931 designation was made. Sold in 1948, it has since remained in private hands in Osaka, where a sword preservation foundation in Ibaraki City participates in its care.

Seeing Nagamitsu Today

Here a practical note is unavoidable. As a privately owned National Treasure without a public museum home, this tachi is not on regular display, and opportunities to view it are limited to occasional special exhibitions. Photography of the actual blade circulates mainly through reference publications.

The good news is that Nagamitsu's work is unusually accessible elsewhere. The Tokyo National Museum holds the Daihannya Nagamitsu, a National Treasure tachi once valued at six hundred kan, displayed in rotation in its Japanese gallery. The Tokugawa Art Museum in Nagoya owns the Tsuda Totomi Nagamitsu, another National Treasure with its own battlefield pedigree. And in the smith's home village, the Bizen Osafune Japanese Sword Museum in Setouchi City, Okayama Prefecture, exhibits blades of the school alongside working forges where smiths demonstrate traditional techniques, usually on the second Sunday of each month.

For the religious dimension, the three Kumano shrines named in the inscription still stand: Kumano Hongu Taisha, Kumano Hayatama Taisha, and Kumano Nachi Taisha, linked by the Kumano Kodo pilgrimage routes inscribed on the UNESCO World Heritage list. Walking even a short stretch of the Nakahechi trail gives a feel for the faith that a Bizen swordsmith, seven hundred years ago, thought worth carving into steel.