* Image is for illustrative purposes only.Ii Naotora
井伊直虎
Woman Daimyo—The Solitary General Who, as the Sengoku Era's Only Female Ruling Lord, Defended Tōtōmi Ii no Ōya to the End
Description
The Sengoku Era's Only Woman Daimyo
Born around Tenmon 4 (1535) in Ii no Ōya, Tōtōmi Province (present-day Hamamatsu, Shizuoka Prefecture), Ii Naotora is known as the exceptional woman daimyo of the Sengoku period. The epithet 'woman daimyo' celebrates Naotora's decisive judgment and courage—qualities that matched any male general—she who was also the adoptive mother of Ii Naotoki, one of the Tokugawa Four Heavenly Kings. Despite losing heirs one after another to cruel fate, Naotora assumed the role of family head while a nun, and defended the small domain of Ii no Ōya, surrounded by the great powers of Imagawa, Tokugawa, and Takeda.
Lord in Adversity
Naotora became family head because the male line of the Ii clan had been systematically purged through the political machinations of the Imagawa clan. Her betrothed cousin, Naotsugu, was slandered by the Imagawa and executed; protecting the young Naotoki (then known as Toramatsu) who remained became Naotora's paramount mission. Despite her status as a nun, Naotora governed Ii no Ōya across all domains—diplomacy, economics, and military affairs—skillfully navigating the treacherous space between great powers. Her abilities were in no way inferior to those of male generals of the time.
Naotora and Swords—The Symbol of the Woman Daimyo's Martial Spirit
In Ii no Ōya, governed by Naotora as its daimyo, swords held paramount significance as symbols of household authority. The blade said to have been possessed by Naotora functioned both as proof of succession to the family headship and as part of a unique cultural context—'the sword of a samurai woman'—whereby women of samurai lineage regarded the blade as a spiritual anchor. Samurai women typically carried the kaiken (concealed dagger) for self-defense at all times, and Naotora was no exception. However, for Naotora, this transcended a mere defensive tool: it was the embodiment of her will and responsibility as family head.
Legacy to Naotoki
Naotora's true legacy lies in the cultivation of Toramatsu—later Ii Naotoki—whom she defended at the cost of her life. Naotoki was promoted by Tokugawa Ieyasu, commanded the elite forces bearing the 'Ii Red Armor' (Ii no Akabe), served as the vanguard of the eastern forces at Sekigahara, and became renowned as one of the Tokugawa Four Heavenly Kings. The domain of Ōmi Hikone granted to Naotoki after Sekigahara ultimately reached 350,000 koku, becoming a great clan that produced regents throughout the Edo period. The small seed of Ii no Ōya that Naotora protected bloomed into the grand flower that was Naotoki.
The Kaiken and Samurai Women's Culture
The relationship between samurai women and swords possesses remarkable cultural depth. The kaiken is a 'blade of self-defense and resolve' that samurai women carried throughout their lives and customarily brought when entering marriage. For Naotora, this kaiken carried special significance—as the embodiment of indomitable will for a woman who had lost her betrothed, become a nun, and yet still defended her household as its lord. The traditions surrounding Naotora's kaiken are passed down to this day as a symbol of women's spiritual strength in Japanese bushidō.
Notable Swords
- Woman Daimyo's Kaiken—The blade for self-defense that Naotora carried throughout her life as family head. The kaiken, which samurai women customarily brought at marriage, transcended a mere defensive tool for Naotora; it was proof of her role as family head and embodied her iron will to defend the Ii clan to the end.
- Tachi Passed Down Through the Ii Clan—A treasured tachi inherited through generations of Ii clan heads. Inherited by Naotora along with the family headship, this blade symbolized the authority and responsibility of the 'woman daimyo' who defended a small domain surrounded by the great powers of the Sengoku era.