Tahara Castle: A Complete Guide to its History and Highlights | A Thorough Explanation of the Castle Associated with Watanabe Kazan
What is Tahara Castle?
Tahara Castle (Tahara-jo) was a flatland castle that once existed in Tahara-cho, Tahara City, Aichi Prefecture. Also known as “Hakou-jo,” it was located in the heart of the Atsumi Peninsula, facing Mikawa Bay. Currently, part of the castle ruins has been developed into a park, with remnants such as the second bailey turret and the main bailey.
Tahara Castle is particularly famous as the castle where the administrative center of the Tahara Domain was located, where Watanabe Kazan, a renowned scholar of Western learning and painter during the Edo period, served as a chief retainer. The Tahara City Museum is now located on the castle site, exhibiting valuable materials related to Watanabe Kazan.
History of Tahara Castle
Construction and the Sengoku Period
There are various theories regarding the construction date of Tahara Castle, but the most widely accepted theory is that it was built by Toda Munemitsu during the Bunmei era (1469-1487). The Toda clan was a powerful local family in Mikawa Province, and they built Tahara Castle as a base for controlling the Atsumi Peninsula.
During the Sengoku period, Tahara Castle became a stage for power struggles between warring daimyo such as the Imagawa, Oda, and Tokugawa clans. After the Battle of Okehazama in 1560, when the Imagawa clan’s power declined, Tahara Castle came under the control of Tokugawa Ieyasu.
Tahara Domain in the Edo Period
In the Edo period, Tahara Castle became the seat of the Tahara Domain. After the Battle of Sekigahara in 1600, Toda Takatsugu became the lord of the Tahara Domain with a stipend of 12,000 koku, and the Toda family continued as lords of the domain until the Meiji Restoration.
Although a small domain, the Tahara Domain was economically stable due to its maritime trade, fishing, and salt production in Mikawa Bay. It also focused on education, establishing the domain school, “Seishokan.”
Watanabe Kazan and Tahara Castle
Indispensable to understanding the history of Tahara Castle is the presence of Watanabe Kazan (1793-1841). Kazan was a scholar of Western learning and a painter in the late Edo period, and he dedicated himself to reforming the domain’s administration as a senior retainer of the Tahara Domain.
Kazan implemented policies to relieve the domain’s people during the Tenpo famine, and is credited with preventing a single death from starvation in the Tahara Domain. He also studied Dutch learning, absorbed Western knowledge, and left behind works such as “Shinki-ron” (Treatise on the Sense of Caution). However, he was imprisoned during the Bansha Incident and ultimately met a tragic end by committing suicide.
Tahara Castle After the Meiji Restoration
After the Meiji Restoration, the Tahara Domain was abolished due to the abolition of the feudal system and the establishment of prefectures, and Tahara Castle was also abandoned. In 1871 (Meiji 4), many of the buildings within the castle were demolished, but some structures, such as the Ninomaru turret, remained.
In the Showa era, efforts began to preserve the Tahara Castle ruins as a historical site, and in the Heisei era, development of the castle ruins progressed. In 1992 (Heisei 4), the Tahara City Museum opened on the site of the main keep, exhibiting materials related to Watanabe Kazan and the Tahara Domain.
Structure and Characteristics of Tahara Castle
Castle Layout
Tahara Castle was a flatland castle and also had the characteristics of a coastal castle facing Mikawa Bay. The castle consisted of three enclosures: the main enclosure (Honmaru), the second enclosure (Ninokuruwa), and the third enclosure (Sannomaru), surrounded by a moat, forming a concentric layout.
The Honmaru was the central part of the castle, housing the lord’s residence and administrative buildings. The second enclosure contained the residences of retainers and warehouses, while the third enclosure was lined with samurai residences.
Relationship between the Moat and the Sea
A major characteristic of Tahara Castle was its location facing Mikawa Bay. The northern side of the castle bordered the sea, and at high tide, seawater flowed into the moat. This gave the castle convenient access to water transport, providing advantageous location for both the transport of goods and defense.
The moat was wide and deep, posing a significant obstacle for attackers. Measures were also in place to protect against incursions from the sea.
Turrets and Gates
Tahara Castle had several turrets. The Ninokuruwa turret, which has been restored, functioned as a key defensive feature of the castle. From the watchtower, one could overlook the castle town and Mikawa Bay, serving the purpose of monitoring enemy movements.
Regarding the castle gates, there were the main gate and the rear gate, but none remain today. The main gate was the castle’s front entrance and is recorded as having had an impressive structure.
Highlights of Tahara Castle
Tahara City Museum
The Tahara City Museum, built on the site of the main keep of Tahara Castle, is the biggest highlight when visiting Tahara Castle. The museum exhibits the history of the Tahara domain and the culture of the Atsumi Peninsula, focusing on the works and materials of Watanabe Kazan.
You can see many paintings, including a replica of Kazan’s masterpiece, “Portrait of Takami Izumiseki” (National Treasure, currently housed in the Tokyo National Museum). Furthermore, the museum displays art materials and letters used by Kazan, offering insights into his personality.
Opening Hours: 9:00 AM – 5:00 PM (Last entry at 4:30 PM)
Closed Days: Mondays (or the following day if Monday is a public holiday), New Year holidays
Admission Fee: 210 yen for adults, 100 yen for elementary and junior high school students (special exhibitions have separate fees)
Restored Ninomaru Turret
The Ninomaru Turret was restored in wood in 1979. The turret has a two-story structure, and the contrast between the white walls and black wainscoting is beautiful. The interior is open to the public and features exhibits on the history and structure of Tahara Castle.
From the turret, you can see the city of Tahara and Mikawa Bay, allowing you to imagine the view seen by the former lords and retainers. On particularly clear days, you can even see the Chita Peninsula in the distance.
Honmaru Site and Stone Walls
The Honmaru site is now the location of the Tahara City Museum, but the original stone walls remain around it. The stone walls were built using an old technique called “nozurazumi,” exhibiting characteristics of castle architecture from the Sengoku period to the early Edo period.
An information board is installed in front of the stone walls, where you can read a detailed explanation of the history and structure of Tahara Castle. The area around the stone walls has also been developed as a park, allowing visitors to enjoy a stroll.
Moat Remains and Earthworks
Parts of Tahara Castle’s moat still remain. The moat remains are filled with water, allowing visitors to experience the atmosphere of the time. A walking path has been built around the moat, allowing visitors to leisurely explore the castle ruins.
Parts of the earthworks also remain, providing clues to understanding the castle’s defensive system. Visitors can walk on top of the earthworks, experiencing the castle’s structure firsthand.
Site of Watanabe Kazan’s Seclusion (Ikenohara Palace Site)
Located close to Tahara Castle are the remains of Ikenohara Palace, where Watanabe Kazan was imprisoned after the Bansha Incident. This is where Kazan spent his final days, and it is now preserved as a historical site. A statue of Kazan stands at the site of his secluded residence, allowing visitors to reflect on his life and achievements. Information boards about Kazan are also installed in the surrounding area, allowing visitors to trace his life’s trajectory.
Access to Tahara Castle
Access by Train
From Toyohashi Station:
- Get off at Mikawa-Tahara Station on the Toyohashi Railroad Atsumi Line, approximately 15 minutes on foot.
- The journey from Toyohashi Station to Mikawa-Tahara Station takes approximately 50 minutes.
From Mikawa-Tahara Station, you can walk through the Tahara city center to the Tahara Castle ruins. Along the way, you’ll find shopping streets and restaurants, allowing you to enjoy the atmosphere of Tahara City.
Access by Bus
From Mikawa-Tahara Station, the Tahara City community bus, “Gururin Bus,” operates. Get off at the “Tahara City Museum” bus stop, and you’ll arrive at the Tahara Castle ruins immediately.
Access by Car
From Nagoya:
- Approximately 60 minutes from the Tomei Expressway “Toyokawa IC” via National Route 151 and National Route 259
- Approximately 40 minutes from National Route 23 (Meito Road) “Toyohashi East IC” via National Route 259
From Shizuoka:
- Approximately 90 minutes from the Tomei Expressway “Hamamatsu IC” via National Route 1 and National Route 259
Tahara City Museum has its own parking lot, which is free to use. It can accommodate approximately 50 cars.
Tourist Attractions Around Tahara Castle
Jōhōji Temple
This is a Sōtō Zen Buddhist temple located very close to Tahara Castle. It houses the grave of Watanabe Kazan and is known as a temple associated with Kazan. There is also a monument inscribed with Kazan’s death poem on the temple grounds, allowing visitors to remember his final moments.
Tahara Festival Hall
This facility exhibits materials related to the Tahara Festival, a traditional festival of Tahara City. The Tahara Festival is held every September, with magnificent floats parading through the town. At the hall, you can see actual floats and learn about the history of the festival.
Zao Mountain Observatory
This observatory is located at the summit of Mt. Zao, 250m above sea level, in the northern part of Tahara City. You can enjoy a 360-degree panoramic view, overlooking Mikawa Bay, the Atsumi Peninsula, and even Mt. Fuji in the distance. It is especially known for its beautiful sunsets.
Irago Cape
This scenic spot is located at the tip of the Atsumi Peninsula. Situated at the boundary between the Pacific Ocean and Mikawa Bay, it features attractions such as the Irago Cape Lighthouse and Koijigahama Beach. It is approximately a 30-minute drive from Tahara Castle.
Rapeseed Fields
The Atsumi Peninsula is one of Japan’s leading flower-producing areas, and from winter to spring, vast fields of rapeseed flowers spread across the area. From January to March, the “Atsumi Peninsula Rapeseed Blossom Festival” is held, attracting many tourists.
Points to Note When Visiting Tahara Castle
Estimated Time Required for Visit
If you want to thoroughly explore the Tahara Castle ruins and the Tahara City Museum, it will take approximately 2-3 hours. This amount of time is necessary to leisurely appreciate the museum exhibits and stroll around the castle ruins.
If you have extra time, we recommend visiting the former residence of Watanabe Kazan and Jōhōji Temple. Including these, the visit will take about half a day.
Best Season for Visiting
While Tahara Castle ruins can be visited year-round, the following seasons are particularly recommended:
Spring (March-May): During cherry blossom season, the cherry blossoms around the castle ruins are in full bloom. The rapeseed blossoms on the Atsumi Peninsula are also at their peak.
Autumn (September-November): The weather is mild, making it ideal for strolling. In September, the Tahara Festival is held, bringing the castle town to life.
Winter (January-February): Thanks to the mild climate of the Atsumi Peninsula, winter is relatively pleasant. A rapeseed blossom festival is also held.
Photography Tips
The following are recommended photography spots at Tahara Castle Ruins:
- Ninomaru Turret: The contrast between the white walls and black wainscoting is beautiful, making it a symbolic landmark of Tahara Castle.
- Stone Walls and Moat: A great spot to capture the atmosphere of a castle.
- Tahara City Museum: Although a modern building, the museum, built on the site of the main keep, symbolizes the history of the castle ruins.
- Turret Across the Moat: The reflection of the turret on the water makes for a picturesque scene.
Trivia about Tahara Castle
Origin of the name “Tomoe Castle”
Tahara Castle’s alternative name, “Tomoe Castle,” is said to originate from the fact that the northern side of the castle faced Mikawa Bay, and the seawater flowed in in a tomoe (comma-shaped) pattern. The character “江” (e) means sea or inlet, indicating that the castle faced the sea.
Tahara Domain’s Rice Yield
The Tahara Domain was a relatively small domain with a rice yield of 12,000 koku (a unit of rice production). However, it is believed that its actual income was higher due to fishing rights in Mikawa Bay and income from salt fields. Furthermore, maritime commerce flourished, resulting in economic stability.
The Multitude of Watanabe Kazan
Watanabe Kazan is known as a scholar of Western learning and a painter, but he also left behind outstanding achievements as a financial reformer and educator for the domain. During the Tenpo famine, he not only released the domain’s rice reserves but also created employment through public works projects, providing relief to the domain’s people.
Furthermore, Kazan was interested in Western military technology and developed theories on coastal defense. However, this incurred the displeasure of the shogunate, leading to his punishment in the Bansha Incident.
The Keep of Tahara Castle
Tahara Castle did not have a keep. This is thought to be because the Tahara Domain was a small domain, and due to castle construction regulations during the Edo period, it was not possible to construct a large keep. Instead, turrets served the role of defense and surveillance for the castle.
Preservation and Utilization of Tahara Castle
Designation as a Historic Site
The Tahara Castle ruins are designated as a historic site by Tahara City. The city is committed to the preservation and utilization of the castle ruins, and regular maintenance and surveys are conducted.
In recent years, archaeological excavations have also been conducted at the castle ruins, sometimes uncovering new remains. These survey results are sometimes made public at the Tahara City Museum.
Utilization in Education
The Tahara Castle ruins and the Tahara City Museum are also used as a place for local history education. Local elementary and junior high schools visit Tahara Castle as part of their local history studies, learning about Watanabe Kazan and the history of the Tahara Domain.
Furthermore, the museum regularly holds lectures and workshops, providing citizens with opportunities to learn about local history and culture.
Utilization as a Tourism Resource
Tahara City is working to promote historical tourism centered on Tahara Castle. Information boards and explanatory signs are installed around the castle ruins, allowing tourists to freely explore.
A tourist route themed around Watanabe Kazan has also been established, allowing visitors to visit his former residence and Jōhōji Temple. The Tahara City Tourism Association also conducts guided tours, allowing visitors to learn more about the history of Tahara Castle.
Summary
Tahara Castle is a historically important castle site located in Tahara City, Aichi Prefecture. From the Sengoku period to the Edo period, it functioned as a coastal castle on Mikawa Bay and flourished as the center of the Tahara Domain.
In particular, it is known as the castle where Watanabe Kazan, a scholar of Western learning and painter of the late Edo period, served as chief retainer. His achievements and tragic life are still recounted by many people today.
Currently, the Tahara Castle ruins have been developed into a park, with the reconstructed Ninomaru turret and the Tahara City Museum, built on the site of the Honmaru (main keep), being the main attractions. At the museum, you can learn about Watanabe Kazan’s works and the history of the Tahara domain, and you can feel the atmosphere of the time while strolling through the castle ruins.
Tahara Castle is also an ideal base for sightseeing on the Atsumi Peninsula. There are many attractive tourist spots in the surrounding area, such as Cape Irago, rapeseed fields, and the Zao Mountain Observatory. Why not visit Tahara Castle and its surrounding area as a travel destination to enjoy history and nature?
Learning about the history of Tahara Castle leads to learning about the realities of local domains in the Edo period and the life of outstanding figures like Watanabe Kazan. Though it is a small castle site, it holds an important part of Japanese history.
