As Japan’s samurai evolved from historical warriors into pop culture icons over the centuries, one important object has remained by their side: the samurai sword. This weapon was often considered to be an extension of the warrior’s own spirit and represented far more than a mere instrument of war; each blade was instead a fusion of practical engineering, artistic mastery, and cultural significance. Today, many of the historic swordsmiths who forged these magnificent blades are as legendary as the warriors who wielded them, and their craftsmanship lives on in the swords now deemed National Treasures, kept alive through the passionate devotion of collectors, scholars, and enthusiasts worldwide.
One of the greatest swordsmiths of all time was Masamune, a craftsman from the region of Sagami Province in modern Kanagawa prefecture. His blades were made of the purest steel and with refined aesthetics; legends speak of the sharpness and even the moral discernment of Masamune swords, which supposedly would not cut through anyone who was innocent or undeserving. Perhaps his most famous sword, known as Honjo Masamune, was owned by the Tokugawa family and passed from shōgun to shōgun over the centuries, but disappeared during the American Occupation after World War II. While this sword is lost, of those that remain, several Masamune creations are now counted among Japan’s National Treasures.
Japan’s National Treasures initiative took root in the decades following the 1868 Meiji Restoration, when concerned citizens, scholars, and leaders realized that aspects of fast-paced modernization were threatening the country’s cultural traditions. By the late 19th century, a preservation movement had emerged alongside official government support for protecting historic structures and artworks. Adjusted in the 1920s then again post-WW2, this movement became the backbone to the modern “National Treasure” designation. This gave birth to the “National Treasure” designation, designed both to preserve culturally vital objects and prevent their removal from Japan.
Since 1950 when the Law for the Protection of Cultural Properties came into effect, a total of 122 blades have been designated National Treasures, including some of Japan’s earliest swords – the straight, single-edged swords called chokutō, modeled on swords from the Asian mainland. Starting in the 8th century, however, Japanese swordsmiths began innovating with new blade-making techniques (including heat treatment) that allowed new form factors to emerge, such as the famed curved sword that would become known as the nihontō, or “Japanese sword.” The earliest curved swords were known as tachi, which had longer blades and were worn with the cutting edge facing downwards, preferred by cavalry who used them to cut down their enemies while mounted on horseback. From the Kamakura period onwards (1185-1333), a shorter curved sword known as the katana became popular among warriors fighting on foot and in close quarters because of its lightness and more efficient design. The katana was worn with the cutting edge facing up, and from the 16th century on, was accompanied by either a wakizashi (short sword) or a tantō (dagger), with the former in a pairing called a daishō (“large and small”) that denoted samurai status throughout the Edo period (1603-1868).
Swords sometimes metamorphosized over time. For example, one of Masamune’s famous swords is known as Kanze Masamune, originally created as a tachi in the early 14th century but later made into a katana by shortening the tang, the part of the metal blade that extends into the handle. The sword has a fine hamon (temper pattern formed during quenching) typical of Masamune blades, featuring the star-like crystal patterning known as nie that he is said to have perfected. It is named for its original owners, the Kanze, a prominent family in Noh theater. However, in the late 16th century, the shōgun Tokugawa Ieyasu (1542-1616) received it from the Kanze family and gave it to his son Hidetada (1578-1632). It then passed through the hands of several of the Tokugawa family’s retainers. After the Meiji Restoration in 1868, the Tokugawa family presented it to a house of the Imperial family. Since 1961 it has belonged to the Tokyo National Museum, and it became a National Treasure in 1959. Although this sword may never actually have seen battle, the fact that it was prized by prominent performers and rulers for over 700 years is testimony to its status not just as a weapon but also as an outstanding work of art.
In its status as an official National Treasure, protected and preserved for future generations, the Kanze Masamune embodies the paradox at the heart of Japanese sword culture: instruments of war transformed into objects of brilliant engineering and beauty. Some seven hundred years after Masamune forged his last piece of steel, his swords still carry an almost physical weight – not just the heft of the blade, but the accumulated gravity of all those centuries. When you stand before one in a museum, you’re not just looking at metal and carbon; you’re witnessing the compression of time itself. The 110 sword treasures by Masamune and other artisans represent just one facet of Japan’s National Treasures program, yet they perfectly illustrate the importance of preservation to keep material culture alive. Through the ongoing devotion of curators, scholars, collectors, and admirers worldwide, these extraordinary objects continue their journey through time.
*Note: Japanese names in this article are written in the traditional Japanese order, with the family name first and personal name last.
Additional Reading
To learn more about the “National Treasure,” or kokuhō, in Japan:
Exploring Japan’s National Treasures | Books
Iconic Japanese Castles | Guardians of History
