Tachi by Sukemitsu of Yoshioka Ichimonji: A National Treasure Sword from the Late Kamakura Period

Among the many masterworks of Japanese swordsmithing, the tachi (long sword) inscribed with the name of Sukemitsu of Yoshioka in Bizen Province stands as one of the finest examples of the art. Designated a National Treasure of Japan, this extraordinary blade was forged in March of the second year of Genkō (1322) during the waning years of the Kamakura period. Its full inscription reads: "Bizen no Kuni Yoshioka-jū Sakon Shōgen Ki no Sukemitsu / Ichi / Namu Hachiman Daibosatsu / Namu Myōken Daibosatsu / Genkō ni-nen san-gatsu hi" — a testament to the smith's identity, lineage, and devotion to the Buddhist deities Hachiman and Myōken.

The Yoshioka Ichimonji School: Master Swordsmiths of Bizen

The Yoshioka Ichimonji school emerged in the late Kamakura period in the Yoshioka area of Bizen Province (present-day Okayama Prefecture), north of the earlier Fukuoka Ichimonji school. The Ichimonji tradition traces its origins to Norimune, who served as an imperial swordsmith for Emperor Go-Toba. These swordsmiths are distinguished by the character "ichi" (一, meaning "one") that they inscribed on their blades.

Among the Yoshioka Ichimonji smiths, Sukemitsu is widely regarded as the most skilled artisan of the entire school. His career spanned from the Einin era (1294) to the Karyaku era (1327), and he signed his blades with exceptionally long inscriptions, using the Ki surname and the official title of Sakon Shōgen (a military rank in the Imperial Guard). The founder of the Yoshioka Ichimonji school was Sukeyoshi, and the school's artisans characteristically used the character "suke" (助) as a generational prefix in their names.

Why This Tachi Was Designated a National Treasure

This tachi was first designated as an Important Cultural Property on May 3, 1940, and subsequently elevated to National Treasure status on March 31, 1953. Its designation reflects the exceptional quality of both its forging and its tempering, which represent the pinnacle of the Yoshioka Ichimonji tradition.

The blade is notable for its outstanding jigane (ground metal) and hamon (temper line). The hamon features a chōji-midare pattern (clove-shaped irregular pattern) mixed with gunome (zigzag pattern), with abundant ashi and yō (variations in the hamon). The nioi is deep and ko-nie (fine crystalline particles) are present, with kinsūji (golden streaks) running through the temper. What makes this tachi particularly remarkable among Yoshioka Ichimonji works is its exceptional brilliance — it is considered one of the most flamboyant pieces from the school, which typically produced more subdued works compared to the Fukuoka Ichimonji tradition.

Physical Characteristics and Artistic Features

The tachi measures approximately 82.3 cm (about 2 shaku 7 sun 2 bu) in blade length with a curvature of approximately 3.4 cm (about 1 sun 2 bu). The blade is constructed in the shinogi-zukuri (ridgeline) form with an iori-mune (gabled back). The curvature is high at the base (koshi-zori), with fumibari (a slight widening near the base), and the kissaki (point) is of medium length.

The forging pattern (kitae) is primarily itame (wood grain) with some areas displaying larger grain, flowing patterns, and ji-nie (crystalline particles on the ground). A midare-utsuri (irregular reflection pattern) stands along the blade, a hallmark of the Bizen tradition. The tang (nakago) retains its original shape (ubu), ending in a kuri-jiri (chestnut-shaped tip), with ō-sujikai file marks and two mekugi-ana (peg holes).

The Sacred Inscriptions: Buddhist Invocations on Steel

One of the most fascinating aspects of this tachi is the religious inscription carved alongside the swordsmith's signature. The blade bears the invocations "Namu Hachiman Daibosatsu" (Hail to the Great Bodhisattva Hachiman) and "Namu Myōken Daibosatsu" (Hail to the Great Bodhisattva Myōken). Hachiman is the Shinto deity of war and the divine protector of warriors, while Myōken is a Buddhist deity associated with the North Star and believed to grant victory in battle.

These inscriptions reflect the deep intertwining of martial culture and religious devotion in medieval Japan. Warriors often commissioned swords bearing such prayers, believing the divine inscriptions would imbue the blade with spiritual protection. The presence of both Shinto and Buddhist invocations on a single blade illustrates the characteristic Japanese syncretism of religious traditions during the Kamakura period.

A Blade Connected to the Tokugawa Shoguns

This tachi carries a remarkable historical provenance connected to the Tokugawa shogunate. According to tradition, the sword was bestowed by the third shogun, Tokugawa Iemitsu, upon Abe Tadaaki (also known as Abe Bungo-no-Kami Tadaaki), who served as a senior councillor (rōjū) under both Iemitsu and the fourth shogun, Tokugawa Ietsuna.

The occasion for this bestowal was a dramatic event: during a severe rainstorm that caused the Sumida River in Edo (present-day Tokyo) to swell dangerously, Abe Tadaaki demonstrated exceptional courage and skill by reading the river's currents and guiding Iemitsu safely across on horseback. Impressed by this act of loyalty and bravery, the shogun rewarded Abe with this magnificent tachi. In the Meiji era, the sword came into the possession of the noted sword collector Horibe Naoomi, and it has remained in private ownership since.

Highlights and Points of Appreciation

For sword enthusiasts and cultural heritage visitors, this tachi offers several key points of appreciation:

• The exceptionally vivid chōji-midare hamon with gunome and kawazuko (frog-shaped) elements, representing Sukemitsu's mastery at its peak
• The original, unaltered tang (ubu nakago) preserving the complete, lengthy inscription — a rarity among swords of this age
• The religious inscriptions that provide insight into the spiritual world of Kamakura-period warriors
• The connection to the Tokugawa shogunal house and the dramatic story of Abe Tadaaki's river crossing
• The outstanding state of preservation for a blade over 700 years old

Where to See Japanese Swords and Related Cultural Treasures

As this tachi is privately owned, it is not on permanent public display. However, National Treasure swords are occasionally loaned to major exhibitions at museums across Japan. Visitors interested in Japanese swords and the Bizen swordsmithing tradition can explore the following institutions:

• Bizen Osafune Sword Museum (Okayama Prefecture): Located in the heartland of Bizen swordsmithing, this museum specializes in the local tradition and regularly exhibits important swords including works by the Ichimonji school.
• Tokyo National Museum (Tokyo): The museum's extensive collection includes numerous National Treasure swords, with rotating exhibitions throughout the year.
• Nagoya Token Museum / Nagoya Token World (Aichi Prefecture): One of Japan's newest sword museums, housing a major private collection with many important blades.
• Osaka Museum of History (Osaka): Located near Osaka Castle, this museum periodically hosts sword-related exhibitions and houses a collection reflecting the region's martial heritage.
• Kyoto National Museum (Kyoto): Holds a significant collection of National Treasure swords and periodically organizes major exhibitions featuring blades from across Japan.

Visitors are encouraged to check museum websites for current exhibition schedules, as sword exhibitions frequently rotate. Major exhibitions featuring National Treasure swords are often announced well in advance and can attract considerable crowds.

Understanding Japanese Sword Appreciation

For international visitors encountering Japanese swords for the first time, understanding a few key concepts enhances the experience greatly. The hamon (temper line) is the wavy pattern visible along the edge of the blade, created during the hardening process. Each swordsmithing school developed distinctive hamon patterns; the Ichimonji school is celebrated for its chōji-midare, which resembles the shape of clove blossoms.

The jigane (ground metal) reveals the folding and forging technique of the smith. Bizen-tradition swords like this tachi typically show itame-hada (wood-grain pattern) with beautiful utsuri (shadow patterns) along the blade. The overall sugata (form) of a tachi — its curvature, width, and proportions — reflects both the aesthetic ideals and practical combat requirements of the era in which it was made.