Minakuchi Castle

Minakuchi Castle, also known as Hekisui Castle, is a hirashiro-style Japanese fortress located in Kōka, Shiga Prefecture. Constructed in 1634 under the orders of Shogun Tokugawa Iemitsu, the structure was built to serve a specific logistical purpose along the historic Tōkaidō highway. As the primary route connecting Kyoto with Edo, the highway lacked suitable accommodation for the Shogun in this specific region following the abolition of a nearby predecessor castle. To ensure security and maintain imperial prestige, Iemitsu commissioned this new castle adjacent to the Minakuchi-juku post station, providing a dedicated lodge for his journey to meet the Emperor.

The architectural design was patterned after the famous Nijō-jō in Kyoto, featuring a central bailey measuring 150 meters square surrounded by a protective moat and stone walls. The layout included corner watchtowers known as yagura, with a larger two-story tower facing the highway, while the remaining three were single-story structures. The grounds boasted gardens designed by Kobori Gonjūrō, the son of the renowned landscape architect Kobori Enshū. Although originally intended as a temporary imperial lodge, the site gained renewed significance in 1682 when it became the seat of the Minakuchi Domain under the Katō clan, descendants of powerful generals who had served both Toyotomi Hideyoshi and Tokugawa Ieyasu.

Today, Minakuchi Castle stands as a partial reconstruction of its former self, having been demolished in 1871 during the Meiji Restoration. While the original main keep and other structures were lost, reconstructed yagura towers now allow visitors to visualize the site's historical layout. Open to the public, the castle serves as a cultural landmark that highlights the intricate travel protocols of the Edo period and the sankin-kōtai system. Its unique history as a castle built specifically for a single night's stay by a reigning Shogun distinguishes it within the landscape of Japanese military architecture.