Toke Castle (Chiba Prefecture) Complete Guide: A Thorough Explanation of History, Structure, and Highlights
Toke Castle (Toke-jo) is a Japanese castle ruin located in Toke-cho, Midori-ku, Chiba City, Chiba Prefecture. It is also known as Kinjo and Kifune Castle. This castle, which is believed to have existed for approximately 850 years from the Nara period to the Sengoku period, is highly regarded by castle enthusiasts and history buffs as one of the most well-preserved medieval castles in Chiba Prefecture.
This article will provide a comprehensive explanation of Toke Castle’s appeal, from its history from construction to abandonment, the changes in its lords, the characteristics of its structure, the highlights of its existing remains, and access methods.
Overview and Basic Information of Toke Castle
Toke Castle was built as a multi-bailey flatland castle, situated on a hill approximately 60 meters above sea level. The castle’s scale extended approximately 600 meters east-west and 400 meters north-south, and it had a structure consisting of multiple interconnected baileys. Basic Data
- Location: Near 825-5 Toke-cho, Midori-ku, Chiba City, Chiba Prefecture
- Other Names: Kinjo, Kifune Castle, Toke Old Castle
- Castle Structure: Concentric flatland castle
- Year of Construction: Said to be during the Jinki era (724-729)
- Builder: Ono Azumahito (legend)
- Main Lords: Ono Azumahito, Chiba clan, Toke clan, Hatakeyama Shigeyasu, Sakai clan
- Year of Abandonment: Tensho 18 (1590)
- Remains: Earthworks, dry moats, baileys, cut-throughs
- Designated Cultural Property: Chiba City Designated Historic Site
History of Toke Castle: From the Nara Period to the Sengoku Period
Castle Construction Legends and the Nara Period
Regarding the construction of Toke Castle, there is a legend that it was built during the Jinki era (724-729) by Ono no Azumahito, who served as the Vice-General in the campaign against the Emishi people. Ono no Azumahito was a military commander of the Nara period, and it is believed that he established the castle in this location as a military base in eastern Japan. However, clear archaeological evidence from this period is limited.
If this legend is true, Toke Castle would be one of the oldest castles in Japan. However, most of the remains that can be confirmed today are thought to date from the medieval period or later. Originally called “Kifune Castle,” the Kifune Shrine is still enshrined on the earthen rampart of the third enclosure’s entrance, preserving a trace of its original name.
Kamakura Period: The Era of the Chiba and Toke Clans
At the beginning of the Kamakura period, Toke Castle came under the control of the Chiba clan, who held considerable power in the Boso region. The Chiba clan was a family that distinguished itself by following Minamoto no Yoritomo’s uprising and controlled a vast territory centered in Shimosa Province.
During this period, Toke Taro, believed to be a member of the Chiba clan, made Toke Castle his residence. The Toke clan, a branch of the Chiba clan, became the local administrator (jitō) of the Toke region and is presumed to have improved and expanded the castle. While detailed records of the Toke clan’s activities are limited, it is certain that Toke Castle functioned as a base for regional control during this period.
Muromachi Period: Decline of the Chiba Clan and Warlordism
Entering the Muromachi period, the Chiba clan gradually lost power due to internal conflicts and conflicts with other forces. During this turbulent period, Toke Castle also became the target of conflict among multiple powers.
In the late Muromachi period, Hatakeyama Shigeyasu appears in records as the lord of Toke Castle. The Hatakeyama clan was a family of warriors who served the Uesugi clan, the Kanto Kanrei (governor of the Kanto region), and controlled Toke Castle amidst the complex power dynamics of the Kanto region during this period.
Sengoku Period: The Rule and Golden Age of the Sakai Clan
The most important turning point in the history of Toke Castle was its capture by Sakai Sadataka in 1487.
Sadataka Sakai, whose base was Nakano Castle (Ichihara City, Chiba Prefecture), seized Toke Castle from Hatakeyama Shigeyasu, and the Sakai clan resided there for approximately 150 years. This Sakai clan, known as the “Toke Sakai clan,” played a crucial role in the Boso region during the Sengoku period.
Initially, the Toke Sakai clan belonged to the Yamanouchi Uesugi clan, the Kanto Kanrei (governor of the Kanto region), but amidst the changing political landscape of the Sengoku period, they deepened their relationship with the Later Hojo clan (Hojo clan), based in Odawara. In the Second Battle of Kōnodai in 1564, the Toke Sakai clan fought on the Hojo side, confronting the Satomi clan. The Hojo clan’s victory in this battle further solidified the position of the Toke Sakai clan.
During the Sakai clan’s time, Toke Castle underwent extensive renovations, and many of the remains visible today are believed to have been constructed during this period. The castle functioned not only as a military base but also as the political and economic center of the Toke region.
1590 (Tensho 18): Toyotomi Hideyoshi’s Siege of Odawara and the Abandonment of the Castle
The history of Toke Castle ends with Toyotomi Hideyoshi’s Siege of Odawara in 1590 (Tensho 18).
The Toke Sakai clan, who belonged to the Later Hojo clan, are believed to have surrendered without resistance to Hideyoshi’s large army. With the fall of Odawara Castle and the downfall of the Hojo clan, the Toke Sakai clan also lost their territory. When Tokugawa Ieyasu entered the Kanto region, the Toke region became a direct territory of the Tokugawa clan or a territory of their hatamoto (direct retainers), and Toke Castle ceased to exist and was abandoned.
After the castle was abandoned, the site gradually fell into disrepair, but the main earthworks and dry moats remained well-preserved to this day.
Structure of Toke Castle: Characteristics of a Concentric Hilltop Castle
Toke Castle is a concealed hilltop castle, characterized by its layout that skillfully utilizes the hilly terrain. Here, let’s take a closer look at the castle’s structure.
Arrangement and Composition of Enclosures
Toke Castle has a concealed structure with multiple enclosures arranged in a series. The main enclosures are as follows:
Main Enclosure (Honmaru)
This is the central enclosure of the castle, located at the highest elevation. It measures approximately 80 meters east-west and 60 meters north-south, and is surrounded by earthworks. From the main enclosure, one could overlook the surrounding area, and it functioned as a military command post.
Second Enclosure
This enclosure is located north of the main enclosure and is the second most important section after the main enclosure. A deep dry moat separates the main enclosure from the surrounding areas, enhancing its defensive capabilities.
Third Enclosure
Located on the west side of the castle, it faces the castle’s entrance. The Kifune Shrine is enshrined on the earthen rampart of this enclosure, making it the spiritual center of the castle.
Other Enclosures
More than 10 enclosures of varying sizes have been identified within the castle grounds, each believed to have served functions such as residential areas, warehouses, and barracks.
Earthen Ramp and Dry Moat: The Defensive System of Toke Castle
The most distinctive feature of Toke Castle is its well-preserved earthen ramparts and dry moats.
Earthen Ramp
Earthen ramparts 3 to 5 meters high surround each enclosure and are still clearly visible today. These ramparts served to prevent enemy intrusion and protect the buildings within the enclosures from wind and rain. The ramparts surrounding the main enclosure, in particular, are remarkably well-preserved, showcasing the castle-building techniques of the Sengoku period.
Dry Moats
Deep dry moats were dug between the baileys and around the outer perimeter of the castle. These moats reached widths of 10-15 meters and depths of 5-8 meters in some places, significantly hindering enemy advances. Vertical moats connected to the bottom of the dry moats, providing rainwater drainage.
Entrances and Passages
The entrances to the castle, known as “koguchi,” were heavily guarded as strategically important defensive points. At Toke Castle, the entrances were designed with curves rather than straight lines to make enemy intrusion more difficult.
Particularly noteworthy is the “Kuran-zaka” pass. This is a passage carved deeply into a hillside, resulting in a narrow terrain with high cliffs on both sides. Kuran-zaka boasts one of the largest scales and best-preserved features in Chiba Prefecture, making it a highlight of Toke Castle.
Water Sources and Wells
Regarding the securing of water, essential for life within the castle, several well sites have been identified within the castle grounds. Furthermore, there is a valley (yato) on the north side of the castle, and it is believed that water from this spring was utilized.
Highlights of Toke Castle: Visiting Existing Remains
Currently, the Toke Castle ruins are maintained as a park and can be freely visited. Here, we introduce must-see points for your visit.
Kurana Slope: One of Chiba Prefecture’s Most Impressive Cut-Throughs
The most impressive remains of Toke Castle are the “Kurana Slope.” This cut-through cuts into the hillside, approximately 10 meters deep and 50 meters long, with cliffs on both sides rising at a near-vertical angle.
The origin of the name “Kurana” is uncertain, but the tension of passing through this narrow passage and the sheer power of the cliffs leave a strong impression on visitors. It is highly regarded among castle enthusiasts as a remains that demonstrates the advanced civil engineering techniques of the Sengoku period.
Earthen Embankment of the Main Enclosure
The earthen embankment surrounding the main enclosure is approximately 4 meters high and 10 meters wide, and is still well-preserved. There are places where you can climb onto the embankment, offering a magnificent view of the castle grounds.
Observing the cross-section of the embankment reveals layers of soil carefully compacted using the rammed earth technique, allowing a close-up view of the castle-building techniques of the Sengoku period.
Dry Moats
Multiple dry moats crisscross the castle grounds, their scale and depth being astonishing. The dry moat between the main enclosure and the second enclosure reaches approximately 7 meters in depth, and looking up from the bottom of the moat gives a real sense of its high defensive capability.
Some dry moats have vertical moats connected to their bottoms, making them valuable remains for understanding the castle’s drainage system.
Kifune Shrine and the Third Enclosure
Kifune Shrine is enshrined on the earthen embankment of the third enclosure. This shrine is considered a remnant of the faith dating back to the time when Toke Castle was known as “Kifune Castle,” and is an important site demonstrating the historical connection between the castle and the surrounding area.
The earthworks surrounding the shrine are also well-preserved, allowing for a clear view of the castle’s layout.
Understanding the Overall Structure of the Castle Site
Information boards and explanatory signs are installed at the Toke Castle ruins, allowing visitors to learn about the castle’s history and structure. Walking around the entire castle site allows you to experience the ingenuity of the layout of the multi-bailey flatland castle and the defensive system that utilized the terrain.
The autumn and winter seasons, in particular, are ideal for visiting the castle as the remains are more clearly visible during the leaf-fall period.
Evaluation and Cultural Property Designation of Toke Castle
Toke Castle is protected as a Chiba City designated historical site and is recognized as an important cultural heritage of the region. It is highly regarded among castle researchers and enthusiasts for the following reasons:
- Excellent Preservation of Remains: Major remains such as earthworks, dry moats, and cuts are clearly preserved, making it invaluable for understanding the structure of castles during the Sengoku period.
- The Impressive Kuranzaka Slope: This cut, one of the largest in Chiba Prefecture, is a unique feature not found at other castle ruins.
- Historical Significance: The castle’s transformation from the Nara period to the Sengoku period is important for understanding the history of the Boso region.
- Easy Access: Located within Chiba City, it is easily accessible by public transportation, making it convenient for visitors.
Toke Castle is ranked as the No. 1 tourist attraction in Chiba City and Chiba Prefecture on a community site for castle enthusiasts, and is a castle ruin with high visitor satisfaction.
Access and Visiting Information
Access by Public Transportation
Train
- Get off at Toke Station on the JR Sotobo Line, approximately 25-30 minutes on foot.
- From the station to the castle ruins, it’s a gentle uphill walk through a residential area.
Bus
- From Toke Station, take the Chiba Chuo Bus bound for Asumigaoka Brand New Mall, get off at the Toke Castle Ruins bus stop, and walk for approximately 5 minutes.
Access by Car
- Approximately 10 minutes from Nakano IC on the Chiba-Togane Expressway.
- There are a few parking spaces around the castle ruins, but it can get crowded on holidays.
- Caution is required when driving as you will be driving on narrow roads within a residential area.
Notes for Visitors
- Visiting is free, but please be careful not to damage the remains as the castle ruins are protected as a historical site.
- The slopes of the earthworks and dry moats can be slippery, so comfortable walking shoes are recommended.
- In summer, vegetation can grow thick, making it difficult to see the remains.
- Don’t forget insect repellent and heatstroke prevention measures.
- There are no toilets or vending machines within the castle ruins, so please prepare in advance.
Estimated Visiting Time
If you want to thoroughly explore the entire castle grounds, please allow 1-2 hours. If you only want to see the main remains, you can do so in 30 minutes to 1 hour.
Nearby Attractions
When visiting Toke Castle, visiting nearby historical sites will give you a deeper understanding of the region’s history.
Nakano Castle Ruins
Nakano Castle (Ichihara City), the base of Sakai Sadataka who conquered Toke Castle, is also about a 20-minute drive from Toke Castle. This is also a castle ruin with remaining remains that can be visited.
Showa no Mori Park
This is Chiba City’s largest park, located about 2 kilometers from Toke Castle. The vast grounds include nature observation facilities, athletic facilities, and observation decks, making it ideal for family visits.
Historic Streetscape of Toke District
Around Toke Station, some streetscapes remain that evoke the atmosphere of a former post town. A stroll through the area, feeling the history of a castle town, is sure to be enjoyable.
Summary: The Charm of Toke Castle and Future Preservation
Toke Castle is a representative castle site of Chiba Prefecture with a long history, ranging from legends of the Nara period to its actual appearance during the Sengoku period. In particular, the remains such as the earthworks, dry moats, and Kuranzaka slope, which were constructed during the Sakai clan’s era, are valuable cultural heritage that conveys the castle-building techniques of the Sengoku period.
Currently, the Toke Castle site is being preserved and maintained through the efforts of local residents, the government, and history enthusiasts, but continued protection activities are necessary. To prevent the deterioration of the remains and pass them on to future generations, the awareness of cultural property protection from each visitor is crucial.
Located relatively easily accessible within Chiba City, Toke Castle offers a chance to experience the remains of a full-fledged medieval castle, making it a historical site worth visiting not only for castle enthusiasts but for anyone interested in history. Standing on the site where warlords of the Sengoku period built, defended, and fought, and reflecting on that history, will surely be an unforgettable experience.
We hope that many people will learn about the charm of Toke Castle, and that this precious cultural heritage will be passed down to future generations.
