Tenchudashi: The Special Wakizashi of Edo Castle — Formal Sword Protocol in Samurai Court Culture

What is Tenchū-sashi? — Sword Etiquette at Edo Castle

"Tenchū-sashi" (tenchū-wakizashi) is a special wakizashi that Edo-period samurai were permitted to wear when visiting or attending Edo Castle (the shogun's official residence).

Under the Edo Shogunate's martial etiquette, the type, length, and mounting style of swords worn were strictly regulated according to location, rank, and occasion. Within the "tenchū" of Edo Castle—that is, within the reception halls, corridors, and grand chambers where the shogun conducted audiences—samurai were forbidden from wearing the ordinary uchigatana (long sword), and instead only a specific-standard wakizashi called tenchū-sashi was permitted.

Morphological Characteristics of Tenchū-sashi

Tenchū-sashi exhibited the following characteristics.

Blade Length Standards

Tenchū-sashi blade lengths were generally around 1 shaku 5 sun (approximately 45 cm), though they varied by era, shogunate policy, and individual rank. There was no strictly unified standard. What was important was that it was "not an uchigatana (2 shaku or longer)."

Formal Mounting Style

Unlike practical swords, tenchū-sashi mountings required dignified, formal-wear-appropriate exterior fittings.

• Shirasaya style: Some records indicate that there was a practice of changing to a shirasaya scabbard when attending the tenchū.
• Metalwork materials: Fittings made from precious metals such as gold, silver, and gilt copper were preferred, and many bore the family crests of the shogun's household or daimyo.
• Wrapped hilts: Tsuka wrapped with cord (itomaki) were used for formal dress, and the color and wrapping method of the hilt cord were sometimes determined by rank.
• Scabbard lacquer color: Decorative finishes such as black lacquer, red lacquer, and mother-of-pearl inlay were applied according to rank.

Blade Characteristics

The blades of tenchū-sashi did not necessarily require special shapes, but blades of appreciable quality were often selected. Records indicate that works by renowned smiths from the Bizen, Yamashiro, and Sōshū traditions were used.

The Role of Tenchū-sashi in Martial Etiquette

Prohibition on Drawing and Formal Sword-Wearing

As a general rule, drawing swords was forbidden within the tenchū of Edo Castle. The wound-inflicting incident caused by Asano Naganori in the "Treasury of Loyal Retainers" (the Genroku Akō Incident of 1701)—famous for the phrase "At the castle"—was treated as a serious violation of the martial etiquette rule against drawing swords in the tenchū.

Tenchū-sashi was "a sword worn as formal custom," serving primarily as a symbol of samurai rank. While it had practical value for self-defense, actively using it constituted a violation of etiquette.

Differences by Rank

The formality of tenchū-sashi varied according to samurai rank.

• Shogun's household and Three Great Houses: The highest-ranking fittings, lacquer work, and blades were used for tenchū-sashi.
• Daimyo (shinpan, fudai, and tozama): Tenchū-sashi with mountings appropriate to their kokudaka (rice stipend) and rank were brought. The formality of swords worn at castle attendance became a barometer of the domain's status.
• Hatamoto and gokenin: More simplified mountings for tenchū-sashi were used. However, hatamoto in positions close to the shogun were expected to use more formal tenchū-sashi.

Coming of Age and Tenchū-sashi — Life Milestones

For samurai men, wearing a tenchū-sashi when visiting Edo Castle for the first time (usually after coming of age) marked a rite of passage into recognized adulthood as a samurai. It was also customary for tenchū-sashi to be inherited from fathers or previous generations, sometimes taking on the significance of family treasures.

Asano Naganori and Tenchū-sashi — Chūshingura and Sword Etiquette

On the 14th of March, Genroku 14 (1701), in the Pine Corridor of Edo Castle, Asano Naganori, lord of Akō domain, wounded Kira Yoshinaka, a member of the kōke (ceremony officials), in an incident known as the "Pine Corridor Incident"—the most famous "sword-drawing outrage in the tenchū" in Japanese history.

The sword Asano used was a tenchū-sashi (wakizashi). Because long swords were left in custody before entering the tenchū, wearing a wakizashi was the only blade permitted according to regulations. However, drawing that wakizashi and wounding a person was considered a grave violation of the Shogunate's martial etiquette, leading to his immediate execution by seppuku.

This incident demonstrates how absolute a norm the concept of "tenchū-sashi as formal, ceremonial sword-wearing" was in Edo samurai society.

Extant Tenchū-sashi Artifacts

Wakizashi transmitted as tenchū-sashi from the households of daimyo and hatamoto are currently housed in museums throughout the country.

• Tokugawa Shogun household and Three Great Houses: Wakizashi transmitted as tenchū-sashi used by the Tokugawa shogun's household and the Three Great Houses are housed in the National Museum, Tokugawa Art Museum (Nagoya), Mito Tokugawa Museum, and similar institutions.
• Daimyo family artifacts: In some cases, mountings transmitted as the daimyo lord's castle-attendance tenchū-sashi are preserved in the archives and local history museums of various domains.

It should be noted that few pieces have clear inscriptions or records bearing the name "tenchū-sashi," and most are identified based on the style of mountings and transmission history.

The Disappearance of Tenchū-sashi Culture After the Meiji Restoration

With the enactment of the Sword Abolishment Edict in 1876 (Meiji 9), the wearing of swords by samurai itself was forbidden, and tenchū-sashi culture simultaneously disappeared. Meiji court ceremonies transitioned to Western-style formal dress and swords, and the "palace sword etiquette" that corresponded to Edo's tenchū-sashi transformed into new forms.

However, in the enthronement ceremony of the Meiji Emperor and important imperial rituals, the presentation of traditional tachi called "imperial swords" continued, and the role of Japanese swords in court ceremonial has persisted to the present day, taking new forms.

Conclusion

Tenchū-sashi occupies a unique position at the "intersection of etiquette and the blade" within Japanese sword culture. Rather than functioning as a practical weapon, tenchū-sashi served as a symbol embodying samurai rank, propriety, and formality, illuminating the order and aesthetic sensibility of Edo-period samurai society through the world of the blade. Through the incident involving Asano Naganori in Chūshingura, the etiquette surrounding tenchū-sashi has become widely known to modern people, and its cultural influence persists to this day.

TOUKENZA features numerous rare wakizashi, including tenchū-sashi. For online viewing and purchases, please inquire through our website.