Naginata (Meirai Kunitoshi)

What Is a Naginata?

The naginata is a traditional Japanese polearm consisting of a curved, single-edged blade mounted on a long wooden shaft. Originally developed for foot soldiers and famously favored by warrior monks (sōhei), it became a symbol of the warrior class throughout the medieval period. The weapon's sweeping cuts were effective against both mounted opponents and groups of attackers. In later eras, it became closely associated with the martial training of samurai women, who learned to wield it in defense of the household.

Although thousands of naginata were forged over the centuries, very few examples were created by the era's most prestigious master swordsmiths. Most masters concentrated on tachi (long swords) and tantō (daggers), which is why a naginata signed by Rai Kunitoshi is such an exceptional surviving treasure.

Two Phases of a Long Career

Rai Kunitoshi's body of work is generally divided into two stylistic phases. His earlier blades display a powerful, robust shape with showy chōji-midare (clove-shaped irregular) tempering patterns. His later works, by contrast, are slender and refined, with quietly elegant suguha (straight) tempering lines—an aesthetic prized by collectors and connoisseurs ever since. The vast majority of his surviving works are designated National Treasures, Important Cultural Properties, or Important Art Objects, a clear testament to the consistent quality of his craftsmanship.

Rarity of the Form

While Rai Kunitoshi left a substantial number of tachi and tantō, naginata bearing his signature are rare exceptions. A reference work on the Rai school notes that "tachi and tantō are common, with naginata and ken (straight swords) only occasionally seen." Each surviving naginata by a Rai master therefore carries enormous documentary value for understanding the school's full range of work.

Artistic Mastery

The Rai school is celebrated for its exceptionally fine ji-gane (forged steel surface) characterized by tightly compacted ko-itame (small wood-grain) hada, beautifully even ji-nie (tiny crystalline particles), and a distinctive nie-utsuri (a misty reflection in the steel)—all hallmarks of the school's superior forging technology. These qualities elevated Rai blades above ordinary weapons into genuine works of art.

A Glimpse Into Warrior Culture

That a master like Rai Kunitoshi was commissioned to forge a naginata speaks to the high status of polearms in samurai society. Naginata were ceremonial as well as practical objects, and a piece by such a renowned hand would have been treasured by its original owner as both a weapon and an heirloom.

The Signature

The three-character signature 来国俊 ("Rai Kunitoshi") is itself a historical artifact. Kunitoshi began adding the "Rai" prefix to his signature around 1288, distinguishing his later works from his earlier two-character "Kunitoshi" inscriptions. Connoisseurs study the precise calligraphic details of these signatures with great care.

The Steel

The Rai school's signature ji-gane—a finely textured surface with a luminous misty reflection—gives blades by Kunitoshi a quiet, almost watery beauty. This optical effect, called nie-utsuri or midare-utsuri, is one of the most admired features of late Kamakura-period blades.

The Tempering Line

Rai Kunitoshi's mature works typically feature a calm, dignified suguha (straight) hamon, sometimes mixed with subtle small clove-shapes. The control required to produce such a refined and consistent line across the length of a polearm blade represents the pinnacle of medieval Japanese metalworking.

A UNESCO World Heritage Site

Mount Koya was inscribed on the UNESCO World Heritage List in 2004 as part of the "Sacred Sites and Pilgrimage Routes in the Kii Mountain Range." Founded in the year 816 by the Buddhist master Kūkai (Kōbō Daishi), it is the headquarters of the Shingon school of Esoteric Buddhism. More than one hundred temples cluster on the high plateau at roughly 800 meters of elevation, surrounded by towering cedars and mountain mist.

Koyasan Reihokan: The Treasure Museum

For visitors interested in the artistic heritage of Mount Koya, the Koyasan Reihokan (Treasure Museum) is essential. Opened in 1921, it houses approximately 28,000 designated cultural properties—including National Treasures and Important Cultural Properties—drawn from temples across the mountain. Its rotating exhibitions occasionally feature swords and other arms preserved on the mountain, providing context for the kind of high-quality blades that have historically been entrusted to Koyasan.

Other Highlights of Koyasan

• Kongōbu-ji: the head temple of Shingon Buddhism, with magnificent painted sliding doors and a celebrated rock garden
• Danjō Garan: the sacred temple complex including the vermilion Konpon Daitō pagoda
• Okunoin: the mystical cemetery with over 200,000 memorial stones lining a 2-km cedar-shaded approach to Kūkai's mausoleum
• Shukubō (temple lodgings): an opportunity to stay overnight at a working temple, share vegetarian shōjin-ryōri cuisine, and join morning prayers

Getting There

Mount Koya is most easily reached from Osaka. From Namba Station, the Nankai Koya Line train travels to Gokurakubashi Station, where a cable car climbs to Koyasan Station near the top of the mountain. Local buses then connect the station to the major temples and museums. The complete journey from central Osaka takes approximately two hours.