天正・桃山の刀剣文化

Warlords and Swords — Famous Blades as Political Instruments

The Tenshō period (1573–1592) and Bunroku-Keichō period (1592–1615) were an era of upheaval in which Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu successively rose to power and achieved national unification. This political transformation had incalculable consequences for sword culture. Famous blades evolved from weapons into "political gifts" — symbols of power, wealth, and cultural sophistication.

Oda Nobunaga was a particularly passionate sword collector whose aesthetic judgment is documented in historical sources such as the Shinchō Kōki. The number of famous swords Nobunaga possessed, awarded to retainers, and presented as diplomatic gifts was enormous: blades given at the wedding of Lady Nōhime, swords presented to Uesugi Kenshin, and the collection of the Ashikaga shogunate's treasures all attest to the central role of famous blades in political diplomacy. Hideyoshi likewise showed extraordinary interest in swords, and along with the tea ceremony, appreciation of fine swords came to define the highest cultural refinement in daimyo society.

The Compilation of Famous Sword Registers

One of the greatest cultural achievements of the Tenshō–Momoyama era was the compilation of meibutsuchō (registers of famous swords). These catalogues, compiled primarily by the Hon'ami family, documented swords recognized as the finest of their time.

To be included, a sword needed exceptional craftsmanship but also a distinguished history of ownership (denrai), high monetary valuation in origami documents, and a record of having been appreciated or presented by a warlord of the highest rank. Attaining the status of meibotsu (famous object) was the supreme honor for any blade. The most important example is the Kyōhō Meibustuchō (Kyōhō Famous Sword Register, compiled by Hon'ami Kochu during the Kyōhō era), whose attributions — "Three Great Spears," "Five Great Swords," "Meibotsu [name]" — became the canonical standards for Edo-period sword appraisal.

Most of the swords certified as meibotsu during this period had passed through the direct possession of Nobunaga, Hideyoshi, or Ieyasu, and their political provenance greatly enhanced their cultural property value. Famous blades such as Sōza-Samonji, Yagen-Tōshirō, and Fudo-Yukimitsu reached the present day through the hands of these rulers.

Momoyama Culture and Sumptuous Sword Furnishings

The defining aesthetic of Momoyama culture was lavish, bold magnificence, with gold deployed without restraint. This spirit pervaded sword furnishings (koshirae) — the ensemble of metalwork and lacquerwork accompanying the blade — producing works of unprecedented opulence.

In tsuba (sword guards), the rustic beauty of iron guards from the Heian and Muromachi periods gave way to sophisticated metalwork in gold, silver, shakudō, plain copper, and shibuichi. The Gotō family established itself as the preeminent metal artists in the service of the shogunate and major daimyo, producing fittings depicting birds, flowers, dragons, tigers, and historical figures in fine tsuba-bori and ke-bori techniques. The three masters — Gotō Jōshin, Gotō Tokujo, and Gotō Eijō — produced what are known as the "Three Gotō Masterworks," among the most prized metal fittings in all of Japanese art history.

Scabbards finished in cinnabar lacquer or black lacquer with gold maki-e decoration are emblematic of Momoyama aesthetic boldness. Koshirae in kin-tame-nuri and nashiji-maki-e styles, made as gifts from Hideyoshi to his inner circle and regional lords, are displayed in major museums today as representative Momoyama craft objects.

The Korean Invasions and Swords

Hideyoshi's Bunroku-Keichō campaigns in Korea (1592–1598) had complex effects on sword culture. Large quantities of Japanese swords were brought to the Korean peninsula, while Korean and Chinese blades were repatriated to Japan as war trophies. Just as the abduction of skilled Korean ceramicists contributed to the later development of Arita and Hagi ware, continental influences on swordsmithing and metalworking technique have also been noted by historians.

Furthermore, the wartime demand surge drove large-scale sword production, altering the existing system centered on individual smiths. The Mino smiths of Seki (Gifu) in particular organized systematic mass production, supplying large quantities of practical swords throughout the turbulent Tenshō era.

From Kotō to Shintō — The Turning Point

The Keichō era (1596–1615) is conventionally regarded as the boundary in sword history between kotō (old swords) and shintō (new swords). The quality of iron, quench-hardening technique, blade geometry, and hamon style all underwent significant changes during this transitional period.

Specifically, the Keichō shintō style — characterized by wider blades with extended kissaki and reduced taper between base and tip — was established in these years. As Japanese society transitioned to the prolonged peace of the Edo period, the uchigatana (practical hip sword) became the standard sidearm for samurai, while the tachi was relegated to ceremonial use. This was not merely a stylistic shift but a reflection of fundamental transformation in samurai society. The Tenshō–Momoyama era — where the practicality of the Warring States period intersected most dramatically with the aesthetics of the Edo period — stands as one of the richest and most complex chapters in the history of the Japanese sword.