* Image is for illustrative purposes only.Women and Swords: Naginata and Kaiken
女性と刀——薙刀・懐剣の文化
The relationship between Japanese women and swords deepened with the rise of the warrior class. Naginata became the emblematic weapon of female warriors and noble ladies, while the kaiken served as both protective tool and symbol of feminine honor in the bridal trousseau.
Description
Female Warriors and the Naginata—Another Blade Culture
In Japanese sword history, the relationship between women and swords has long been treated as peripheral, yet it actually possesses a very deep and rich history. Particularly within warrior society, women were also bearers of blade culture and its spiritual successors. The naginata, a long-shafted weapon used widely among monk-warriors and samurai from the late Heian through Kamakura periods, increasingly acquired the character of a "woman's weapon" from the Nanbokuchō period onward. This was because the naginata emphasized not merely physical strength but body positioning, spacing, and technique, offering practical advantages that allowed women of lesser stature to stand against male warriors. During the Sengoku period, records show that many warrior women trained in naginata and participated in actual combat defending castles. The most renowned female warrior is Tomoe Gozen, known as the consort of Minamoto no Yoshinaka. Fighting alongside male warriors during the Genpei War, Tomoe Gozen's fearless martial prowess was repeatedly depicted in later military chronicles and paintings. Records of Tomoe Gozen in the *Heike Monogatari* and *Genpei Seisui Ki* deeply imprinted upon Japanese culture the image of women wielding the naginata.
Naginata Blade-Making and Smiths
Naginata blades were made by the same smiths who produced tachi and uchigatana. The Yamato-tradition smith groups connected to great temples and shrines of Nara and Yamato—particularly the Tegai, Taima, and Senjuin schools—were known to produce many naginata for monk-warriors. Naginata from the Kamakura period, called "ko-naginata" (ancient naginata), typically featured relatively long blades with pronounced curvature. By the Nanbokuchō period, blades became even longer and wider, giving rise to "dai-naginata" (large naginata). Most surviving ancient naginata blades were later shortened and converted into tachi or uchigatana forms—a process called "naginata-naoshi"—making examples that retain their original naginata form exceptionally rare. Key distinguishing features of naginata-naoshi are the unique curvature quality (a thin-based curvature distinct to the form) and the blade's width change (tapering sharply from base to tip). Blades bearing these characteristics are very likely conversions of superior medieval naginata, making them fascinating from a sword-connoisseurship perspective.
The Kaiken—Bride's Protective Sword
The kaiken, "a sword carried in one's bosom," refers specifically to a short sword carried by women for self-defense. From the Heian period, noblewomen had the custom of carrying a short sword concealed for protection, and with the establishment of warrior society, this practice spread to warrior women. By the Edo period, it became codified as "essential bridal trousseau." In warrior marriages, it became customary for brides to bring kaiken among their dowry items. This kaiken functioned as a "protective sword" for self-defense in the husband's absence or during emergencies, and simultaneously served as a last resort to preserve chastity. The fittings of kaiken presented to noblewomen and samurai brides were extraordinarily elaborate, housed in "kaiken bags" decorated with family crests on silk crepe, gold maki-e lacquer, and cloisonné work, and were treated as particularly prestigious items within the complete bridal trousseau.
Kaiken Smithcraft and Artistic Value
Kaiken blades were made by the same smiths who produced ordinary tantō, though high-quality kaiken employed works by renowned smiths. Most featured either hira-zukuri or kamuro-otoshi-zukuri form, with blade length typically around nine sun. Blades often bore carved Sanskrit characters, images of Acala, or kurikara dragons, embodying protective prayers—a fascinating fusion of the smith's tempering skill and religious symbolism. The artistic value of the fittings was also extremely high; fine kaiken transmitted through noble, shogunal, and daimyō families are designated as National Treasures or Important Cultural Properties based on the comprehensive aesthetic merit of blade and fittings combined. The Tokyo National Museum, Kyoto National Museum, and museums at various former samurai residences hold excellent kaiken collections, displayed as important historical materials demonstrating the intersection of Japanese women's culture and blade culture.
Modern Development of Naginata as Women's Martial Art
From the Meiji period onward, naginata spread as a physical education subject in girls' schools, being reorganized as a modern martial discipline. Within the Meiji government's "Rich Nation, Strong Military / Good Wives, Wise Mothers" policy, naginata training was encouraged for women, particularly spreading through high schools and women's teacher-training schools nationwide. This represents a reinterpretation of medieval female warrior culture within a modern educational context, demonstrating that the relationship between Japanese women and blades remains a living tradition spanning centuries. Today, the All-Japan Naginata Federation continues to promote naginata as martial art, sport, and education, and through naginata club activities in middle schools, high schools, and universities, the spirit of medieval Japanese blade culture is transmitted to contemporary young women. Additionally, some contemporary smiths specialize in commissions for kaiken and naginata from female patrons, showing that the tradition of women and blades continues as living culture in the modern era.
Collecting Perspective
The kaiken is a unique collecting object evaluated for both the blade's aesthetic merit and the fittings' craft value. Kaiken transmitted through renowned warrior and noble families derive maximum added value from the certainty of provenance, and examples with assured lineage command high market prices even when the blade's craftsmanship is merely competent. Conversely, ancient naginata (including naginata-naoshi) remain a relatively overlooked collecting field—a hidden market where true quality is undervalued relative to perceived significance. Naginata-naoshi from the Tegai and Taima schools exemplify the rare opportunity to appreciate Yamato-tradition straight-grained surface patterns and straight edges within the body structure distinctive to naginata, making them particularly attractive to collectors with deep knowledge of Yamato traditions.
Characteristics of This Era
- Naginata-naoshi forms — converted polearm blades; identified by thin kasane at the base and dramatic taper toward the tip
- Kaiken as total artwork — blade quality combined with silk, lacquer, and cloisonné mountings create composite art objects
- Religious carvings predominant — Sanskrit, Fudō, and kurikara motifs especially common on female-oriented blades
- Strong provenance chains — bridal trousseau kaiken with genealogical records offer among the best-documented sword provenances