* Image is for illustrative purposes only.Iida Castle
飯田城
Iida Castle is a historic castle in Chūbu dating from the Built circa 1394–1428 (Ōei era), whose lord was Sakanishi clan / Ogasawara clan / Wakisaka clan / Hori clan.
Overview
About Iida Castle
Iida Castle is a hillside castle (hirayamajiro) situated at the southern tip of the Ina Valley in southern Nagano Prefecture, standing on a terrace above the western bank of the Tenryū River and commanding the strategic center of southern Shinano. Its history is said to have begun with its construction by the Sakanishi clan around the Ōei era (1394–1428) of the Muromachi period; during the Sengoku period it came under the control of Takeda Shingen and served as an important strategic base for the Takeda's governance of the Ina Valley. After the Honnō-ji Incident, Tokugawa Ieyasu secured control of the Ina Valley, and throughout the Edo period Iida Castle developed as the political and economic center of the Iida Domain. Domain lords rotated among the Ogasawara, Wakizaka, and Hori clans—a testament to Iida's enduring strategic importance to the Tokugawa shogunate.
Geography and Culture of the Ina Valley
The Ina Valley, where Iida is situated, is an elongated basin nestled between two mountain ranges of approximately 3,000 meters—the South and Central Alps. Enriched by the abundant waters of the Tenryū River, this valley witnessed the early development of agriculture and forestry, while simultaneously serving as a vital transportation corridor connecting the Tōkaidō and Nakasendō routes with the Kōshū Kaidō. The warriors of the Ina Valley honed their martial skills in the demanding mountain environment, and like other regions of Shinano, cultivated a sword culture that emphasized practical, durable blades. Iida is also known as the "Land of Apples," and the cultivation of apples, pears, and other fruit crops that flourished after the Meiji Restoration added a new chapter to the agricultural culture of the Ina Valley.
The Takeda Clan and the Ina Valley
During the era when Takeda Shingen brought the Ina Valley under his control, Iida Castle functioned as an important strategic base on the route of expansion from Kai into Tōtōmi and Mikawa. While Shingen placed castellans throughout Shinano to administer his domains, Iida Castle in particular was consistently valued as a strategic stronghold linking Kai and Mikawa in the governance of the Ina Valley. Following the fall of the Takeda clan in the 10th year of Tenshō (1582), Iida Castle passed through the hands of multiple lords as the forces of Oda, Tokugawa, and Toyotomi vied for dominance, enduring the tumultuous final years of the Sengoku period. These successive changes of castle lords bear witness to the high strategic value of the Ina Valley itself, and the layered samurai cultures brought by each ruler combined to give Iida its rich historical depth.
The Ruins of Iida Castle and the Modern Era
Today, the grounds of Iida Castle's main citadel house the Iida City Museum of Art, and the site has been developed as a castle-ruins park. Portions of the main citadel's stone walls and moats remain intact; in particular, the three surviving gates—the Sakuramaru Gate, Akamon Gate, and Karamete Gate—are precious architectural remnants that convey the style of castle construction in the castle's heyday. The "Weeping Cherry of the Female Lord" that stands on the western side of the main citadel is renowned as an ancient cherry tree over 400 years old and has become an iconic symbol of spring at Iida Castle. The Iida City Museum of Art displays swords, armor, and historical materials related to the Iida Domain, making it an important facility for understanding the samurai culture of southern Shinano.
Sword Culture of Southern Shinano
Southern Shinano is a region where sword-smithing culture has deep roots; the sword smiths of the Ina Valley forged sturdy blades emphasizing practical durability, using iron-bearing sand from the Tenryū River basin and the pure water of the mountain regions. While Shinano blades in general are known for their sturdy construction suited to actual combat, records show that the swords produced by southern Shinano smiths were particularly favored by the military commanders of both the Takeda and Tokugawa clans. Moreover, the Ina Valley was home to numerous woodworkers and lacquer artisans of long standing, and the craftsmanship of sword hilts, scabbards, and mountings (koshirae) achieved high standards. Traditional woodworking and lacquerware workshops still remain in Iida today, and the transmission of traditional techniques connected to the decorative arts of sword fittings continues. Standing against the backdrop of the southern Shinano mountain ranges, the ruins of Iida Castle remain a concentrated point of southern Shinano history where the legacies of Takeda and Tokugawa overlap, continuing to inspire quiet emotion in all who visit.
Connection to Swords
Iida Castle's sword culture took its distinctive character through the mountainous nature of the Ina Valley and the presence of Takeda Shingen as a great patron. The Takeda clan is known as one of the daimyo of Japan's Warring States period that most systematically and comprehensively managed and collected swords and armor. Shingen generously patronized swordsmiths of Kai and Shinano Provinces, and the swords used by the elite cavalry units of the Takeda army boasted the highest standards in both sharpness and durability. The numerous celebrated swords possessed by the Twenty-Four Takeda Generals continue to be passed down in discussion among sword enthusiasts today. During the period when Iida Castle was under Takeda clan control, it is believed that swordsmiths in the castle town established a system for mass-producing high-quality practical swords to meet the demands of the Takeda military. The iron sand of the Ina Valley in Shinano Province was of excellent quality, and the clear waters of the Tenryū River provided ideal water temperature for the quenching of tamahagane (jeweled steel). The South Shinano blades produced in this environment became known as "Takeda swords" and, alongside swordsmiths of Kōfu and Matsumoto, occupied a significant place in Shinano sword culture. During the Edo period, the Wakisaka and Hori clans, which ruled Iida, each possessed their own sword collections, and the numerous masterpieces brought to Iida Castle elevated the cultural standard of the samurai culture of the Ina Valley. The Iida City Art Museum houses swords and armor connected to the Ina Valley of Shinano Province, and one can trace the evolution of the samurai culture of South Shinano from the Takeda clan to the various Edo-period daimyo. Iida's sword culture embodied practical sturdiness rather than ornate elegance, crystallizing directly into the form of swords the spirit of warriors forged by the harsh nature of the mountainous region. When imagining the scene of swordsmiths of the past wielding their hammers while hearing the crystalline air of the Ina Valley and the sound of the Tenryū River, one can touch the essence of the simple power and beauty inherent to the origins of the Japanese sword.
Highlights
- Iida City Museum (on the honmaru site; nature, history, and culture of South Shinano)
- 400-year-old weeping cherry tree ('Lady of the Castle')
- Three surviving castle gates from the Edo period
- Views of the South and Central Alps flanking the Ina Valley
- Iida mizuhiki cord craft (nationally designated traditional craft)
- Tenryūkyō Gorge (Tenryū River scenic boat trips)
* Opening hours and admission fees are subject to change. Please check the official website before visiting.