The Kamakura Shogunate and Sword Ritual: Yoritomo's Warrior Culture of Dedication, Bestowal, and Oath

When Minamoto no Yoritomo was appointed Shogun in 1192 and established a samurai government in Kamakura, it became a major turning point in the history of Japanese swords. Before this, swords were in the world of the imperial court and nobility, serving both as "ceremonial prestige goods" and "practical weapons," but with the establishment of the Kamakura shogunate, their function as a "medium for samurai oaths, dedications, and investitures" became institutionalized. This article explains in detail the actual practice of sword ceremonies in the Kamakura shogunate, using descriptions from primary sources such as the "Azuma Kagami" as reference points.

Until the Heian period, tachi were simultaneously tools that demonstrated formality in gift-giving and ceremonies, and practical implements used in actual battles. With Yoritomo's establishment of samurai rule, this dual nature gradually shifted its center of gravity toward a new role as "ritual implements for reestablishing master-servant relationships." In what follows, we will examine these concrete aspects in accordance with historical records.

Records of Sword Dedications as Seen in the Azuma Kagami

In the Azuma Kagami, the official history of the Kamakura shogunate, scenes where swords function as the center of ritual are depicted throughout. Particularly important is the record of Yoritomo's dedication of a tachi at the Tsurugaoka Hachimangu Shrine (Bunji 1, 1185). This account clearly demonstrates that samurai sword dedications were not merely acts of gift-giving, but were institutionally positioned as religious acts constituting "oaths to the gods." What deserves attention is that both "hounō" (dedication) and "hairyō" (investiture) were also means of confirming master-servant relationships in samurai society.

The movement of swords itself carried political and social significance, embodying in material form the master-servant bond that could not be fully expressed in words.

Tsurugaoka Hachimangu Shrine enshrines Hachiman, the clan deity of the Minamoto, and as the god of the bow and arrow and of military fortune, it commanded deep devotion from warriors. The record of Yoritomo's dedication of a tachi at this place can be understood not merely as an expression of personal faith, but as a symbolic event in which the new samurai government of the Kamakura shogunate sought legitimacy in the protection of the gods and Buddha. Through the act of dedication, a system was established whereby the position of shogun itself gained sacred backing.

Swords and Oaths—A Symbolic Medium in Place of "Blood Seals"

The role that swords played in oaths among medieval samurai is often overlooked. While the standard format for kishōmon (oaths/sworn documents) of the Kamakura period used divine punishment as witness, there are also numerous recorded instances where the giving and receiving of swords functioned as proof of an oath.

The ritual chain of "tachi dedication before the gods → activation of divine will" clearly demonstrates the concept that swords were a "medium connecting the will of the gods and the oaths of samurai." Under Yoritomo's rule, the reciprocal relationship of "on and kōgun" (benevolence and service) that bound the vassals together is thought to have been reinforced and made visible through such sword rituals. The physical presence of swords at the site of an oath created binding force and sacred power that words alone could not provide.

Behind the placement of swords at the site of oaths lay an ancient belief system, thought to view swords not merely as weapons but as entities capable of purifying defilement and harboring sacred power. One might say that the physical presence of a "thing"—a sword with an actual blade—placed at the site supplemented the tension and weight that mere words in a kishōmon could not convey. This sensibility might also be understood as the beginnings of the later concept that "swords embody the soul of the samurai."

The Reality of Dedicated Swords—Extant Kamakura-Period Dedications

Many Kamakura-period swords dedicated at shrines and still extant today are not in perfect condition, but some have been designated as National Treasures or Important Cultural Properties. Among the dedicated tachi preserved at the following shrines and other locations, those attributed to the Kamakura period include works displaying the characteristics of each of the three major sword-producing regions of Bizen, Yamato, and Yamashiro, testifying to the breadth and high quality of sword production at that time.

• Tsurugaoka Hachimangu Shrine
• Kasuga Taisha
• Ise Grand Shrine

Dedicated swords were typically presented with "koshirae" (fittings including scabbard and handle), and the lavishness of the decorations served as an indicator of the dedicator's status and wealth. The design of the metal fittings and the craftsmanship of the makie (gold-sprinkled lacquerwork) applied to the scabbard clearly prove that swords possessed artistic and symbolic value beyond that of mere weapons.

Most of these dedicated swords have been kept under strict guard at the shrines and displayed only on festival occasions or special circumstances. The very fact that these swords have been transmitted down to the present day over many centuries testifies both to the weight of the prayers that samurai of that time poured into swords and to the dedication of shrine officials in preserving them. The ability to discern the characteristics of place and period of production from the style and form is one aspect of the documentary value that such dedicated swords possess.

The System of Hairyō—"Imperial Bestowal" from Shogun to Vassal

"Hairyō" (investiture) is not merely the transfer of goods. A shogun's "kasshi" (bestowal) of a tachi to a vassal was a reconfirmation of the master-servant relationship and constituted for the vassal incontrovertible evidence proving in material form the "shogun's direct trust." The phrase "before the shogun, a tachi is bestowed" repeatedly appears in the Azuma Kagami.

A tachi received through hairyō was not merely a tool for use, but was regarded as an important item to be transmitted to descendants as a family treasure. The record of the provenance—"when and from whom the tachi was received"—became the basis for demonstrating a samurai family's standing, and swords accumulated history and authority in physical form. The very provenance of the tachi became testimony to the family's legitimacy and pride.

The custom of preserving a tachi received through hairyō as a family treasure and transmitting it to the next generation held meaning beyond merely passing down a physical object. By passing down the story of the tachi's provenance alongside the sword itself, families were transmitting the very history of the house to the next generation. This emphasis on provenance demonstrates that swords were treated not as standalone works of art, but as entities inseparably bound to the history of the house.

The Value Demonstrated by Provenance—Records of Dedication and Investiture and Modern Sword Appreciation

The practices of "dedication" and "investiture" established in the Kamakura period offer perspectives that extend beyond mere historical events to inform appreciation of Japanese swords today. The provenance (transmission history) of how a sword has been passed down is regarded as one of the important clues for appreciating and understanding a sword, alongside style, steel grain, and blade pattern. A sword with a clear provenance might be said to be "another kind of signature" that tells which era and under what circumstances the sword was valued.

When we encounter a tachi for which records of dedication or investiture remain, we are not merely appreciating the shaping of metal, but are also touching the thoughts and feelings of the people who preserved and transmitted it. When handling or appreciating a Japanese sword, reflecting on such provenance should deepen one's understanding of the work.

The Legacy of Sword Culture Established by the Kamakura Shogunate

The sword rituals institutionalized by the Kamakura shogunate were transmitted without interruption into the samurai culture of the Muromachi and Edo periods. Swords were positioned as entities fulfilling the following functions, and this thought forms a long lineage leading to the concept in the Edo period that "swords embody the soul of the samurai."

• The identity of the samurai
• A medium for master-servant relationships
• A symbol of oaths to the gods

This view of swords established in the Kamakura period positioned Japanese swords as a complex of spiritual, social, and religious meanings, transcending their function as mere weapons. It can be said that behind the high esteem in which Japanese swords are held as works of art and cultural properties in the modern era lies a deep accumulation of such sword rituals in medieval samurai society. When viewing swords, reflecting on the history of dedications and investitures behind them also provides a rich perspective for engaging with Japanese swords as cultural properties.