Shikawata Castle (Yotsukaido City, Chiba Prefecture) Complete Guide: History, Remains, Current Status, and Visitor Information
Shikawata Castle, located in Shikawata, Yotsukaido City, Chiba Prefecture, is one of the important medieval castles in Shimosa Province during the Sengoku period. Also known as “Shishigahana Castle” or “Shikagahana Castle,” this castle site, while retaining well-preserved remains, is currently in a unique situation where access is restricted. This article provides a detailed explanation from all angles, covering the historical background of Shikawata Castle, its builder and purpose, details of the remains, its relationship with surrounding related castles, and the current visiting situation.
Basic Information and Location of Shikawata Castle
Location and Geographical Characteristics
Shikawata Castle is located in Tozaki, Shikawata, Yotsukaido City, Chiba Prefecture, built on a plateau along the JR Sobu Main Line between Yotsukaido Station and Monoi Station. The castle ruins are built on the tip of a tongue-shaped plateau, 25-30 meters above sea level, surrounded by valleys to the east and west. It is a medieval castle measuring approximately 200 meters north-south and 150 meters east-west.
The topography—a long, narrow plateau about 30 meters high facing the Onagi River—provided excellent defensive capabilities as a natural stronghold. The plateau’s shape resembles a deer’s nose (head), giving rise to the alternative names “Shika-ga-hana” (Deer’s Nose) and “Shishi-ga-hana” (Lion’s Nose), which have been familiar names in the area since ancient times.
The Position of Castles in Yotsukaido City
Nineteen castle sites have been identified in Yotsukaido City, and Kawato Castle is known as one of the castles with the best-preserved remains. Other major castles in the city include Warabihorikomi Castle, Fukuseiji Castle, Kide Castle, Yamanashi Castle, Onagi Castle, Byobuyama Castle, Nakanotozaki Castle, Nakayama Castle, and Ikenoshiri-kan. These form an important group of ruins that demonstrate the sphere of influence of the Chiba clan in Shimosa Province.
History and Construction Background of Kawato Castle
Builder and Construction Period
There are no definitive historical records regarding the builder of Kawato Castle, and many aspects of its construction and its builder remain unknown. However, based on place names and legends, it is presumed to have been built by the Kawato clan, a branch of the Usui clan.
The Usui clan was a branch of the Chiba clan, a powerful local family in Shimosa Province, and their base was in Usui, Sakura City. The place name Kawato suggests that a branch of the Usui clan ruled this area and built Kawato Castle as their base. While there are no clear records regarding the exact construction date, the castle’s structure and size suggest it dates to the mid-to-late Sengoku period (Warring States period).
Relationship with Usui Castle
An important aspect of understanding the history of Kawato Castle is its relationship with the nearby Usui Castle. Usui Castle was one of the largest medieval castles in Chiba Prefecture, and during the Sengoku period, it was a strategic point fought over by various forces, including the Hojo, Uesugi, and Satomi clans.
Regarding Kawato Castle, two main possibilities have been proposed.
Possibility ①: A Sub-Castle of Usui Castle
This theory suggests that, given its relatively large size and remaining earthworks and dry moats, it was used as a sub-castle to protect Usui Castle. The view is that the Usui clan built a sub-castle in Kawato, located south of Usui Castle, to solidify their sphere of influence, and stationed family members there. In this case, Kawato Castle would have functioned as a strategic base, forming part of the Usui Castle defense network.
Possibility ②: The Theory of a Fortified Camp Built by an Opposing Force
On the other hand, it has also been suggested that Usui Castle may have been a fort built by opposing forces such as the Uesugi or Satomi clans when they attacked Usui Castle. During the Sengoku period, Usui Castle was the site of numerous battles. In particular, Uesugi Kenshin attacked Usui Castle during the Eiroku era (1558-1570), and it is possible that this fort was used as a camp during that time.
Insights from the Chiba Prefecture Medieval and Early Modern Castle Site Research Report
The Chiba Prefecture Medieval and Early Modern Castle Site Research Report includes topographical surveys of the Shikawatari Castle site and academic investigations of the surrounding area. According to this report, the castle is located on the tip of a tongue-shaped plateau surrounded by valleys to the east and west, and the central part contains a main enclosure surrounded by an inner masugata (square-shaped) entrance and earthworks and dry moats with irregular bends and distortions.
From this structural analysis, it is clear that Shikawatari Castle was not merely the residence of a local powerful family, but was systematically constructed as a castle with considerable military functionality.
Layout and Remains of Shikawatari Castle
Basic Structure of the Castle
Shikawatari Castle is a castle with a linear layout. The structure, which divides a long, narrow plateau with dry moats and connects multiple enclosures, is one of the typical forms of medieval castles. The following are the main remains that have been confirmed:
Structure of the Main Enclosure (Honmaru)
The main enclosure, the center of the castle, is heavily defended by earthworks and dry moats. Particularly noteworthy is the presence of an inner masugata (square-shaped) entrance. This type of entrance, designed to prevent enemy intrusion, demonstrates advanced castle-building techniques.
The earthworks surrounding the main enclosure have bends and curves, a design intended to facilitate flanking attacks by the defenders. Such ingenious structures reflect the development of castle-building techniques in the late Sengoku period.
Previously, the main enclosure was maintained as “Kyodo-no-Mori Park” and was well-maintained for a period. Due to the excellent state of preservation of the remains, it has attracted attention among castle researchers.
Characteristics of the Earthworks
The earthworks of Shikawatari Castle are well-preserved not only in the main enclosure but also in the southern enclosure. While the height and width of the earthworks vary depending on the location, they maintain a scale sufficient to adequately function as defensive structures.
The earthworks may not have been simply piled up but were reinforced using a technique called rammed earth construction, resulting in a robust structure capable of withstanding long-term use. The existence of earthworks that can still be clearly seen today is evidence that Shikawatari Castle functioned as a full-fledged military facility.
Arrangement of the Dry Moats
The dry moats dividing the plateau are the cornerstone of Shikawatari Castle’s defensive system. In the interconnected enclosure layout, the dry moats separating each enclosure functioned as an important barrier to prevent enemy intrusion.
The depth and width of the dry moats are unknown due to the lack of archaeological excavation, but observations from the ground surface suggest they were of considerable size. The dry moat was not merely a ditch; the excavated soil was piled up to form an earthen embankment, creating a more effective defensive line.
Arrangement and Function of the Enclosures
Shikawatari Castle has a structure in which multiple enclosures are connected to the main enclosure. While historical records are scarce regarding the specific uses of each enclosure, and therefore speculation is limited, considering typical examples of medieval castles, it is thought that the main enclosure served as the lord’s residence and command post, while the other enclosures were used as troop garrisons and storage areas for supplies.
The size, approximately 200 meters north-south and 150 meters east-west, is standard for a local powerful family’s castle, but it is among the largest in Yotsukaido City. This size indicates that Shikawatari Castle was not merely a watchtower, but a full-fledged castle capable of accommodating a certain number of troops.
Relationship with Surrounding Related Castles
Positional Relationship with Major Castles in Chiba Prefecture
Understanding the relationship with surrounding castles is important for understanding Shikawatari Castle. Numerous medieval castles existed within Chiba Prefecture, each forming a complex political and military network.
Usui Castle: The main castle of the Usui clan, a branch of the Chiba clan, located approximately 10 kilometers northeast. It is considered to have the closest relationship with Kawato Castle.
Sakura Castle: Although a castle was renovated in the early modern period, a medieval castle preceded it.
Hon-Sakura Castle: A large-scale castle known as the base of the Chiba clan. It is a nationally designated historical site.
Kide Castle/Nakayama Castle: Other castles within Yotsukaido City, similar to Kawato Castle, are ruins indicating the sphere of influence of the Chiba clan.
Strategic Location in Shimosa Province
The location of Kawato Castle is interesting when considering the transportation routes of Shimosa Province. Its plateau topography allowed for overlooking the surrounding lowlands, functioning as a military observation post.
During the Sengoku period, Shimosa Province was a complex political landscape, with the Hojo clan (Odawara), Uesugi clan (Echigo), Satomi clan (Awa), and local powers such as the Chiba clan all intertwined. Kawato Castle may have played a role in the defense of Usui Castle or been used as an offensive base amidst these power struggles.
Current Status and Visiting Information for Kawato Castle
Current Land Use
The Kawato Castle ruins are currently privately owned, and public access is restricted. It was once developed as “Kyodo-no-Mori Park” and open to citizens and castle enthusiasts. However, due to issues with visitor etiquette and unresolved negotiations between the landowner and the city, it is now closed and access is prohibited.
This situation is unfortunate for castle enthusiasts, but as it is privately owned, the owner’s wishes must be respected. Unauthorized entry is a violation of the law and must be absolutely avoided.
Viewing Methods from the Surrounding Area
While direct access to the castle ruins is not permitted, it is possible to observe the site to some extent from the surrounding area. Parking is available at Zenkoji Temple (334 Shikawata, Yotsukaido City), and this serves as a starting point for exploring the surrounding area.
Farm roads surround the castle ruins, allowing you to observe the plateau’s topography and the castle’s location. However, these farm roads are private property and used for agricultural work, so please be considerate of local residents when using them.
Precautions During Visits
When visiting Shikawata Castle Ruins, please observe the following points:
- No Trespassing on Private Property: The castle ruins are private property. Unauthorized entry is strictly prohibited.
- Consideration for Local Residents: When taking photographs or strolling around, please be quiet and avoid disturbing the lives of local residents.
- Do Not Interfere with Agricultural Work: When using the surrounding farm roads, please be careful not to interfere with agricultural work.
- Please take your trash home: When the area was open as a park, visitor etiquette was a problem. Visitors are requested to always take their trash home and be mindful not to pollute the environment.
- Appropriate use of the parking lot: When using the Zenkoji Temple parking lot, please be considerate of temple visitors.
Expectations for future preservation and utilization
The Shikawatari Castle ruins are the best-preserved castle ruins in Yotsukaido City, and their historical value is extremely high. Currently, access is restricted, but it is hoped that appropriate preservation and utilization will be achieved in the future.
If designated as a cultural property or developed as a historical park, it will be possible to utilize it for historical education and as a tourist resource. To achieve this, it is important for landowners, the government, citizens, and researchers to cooperate and formulate a sustainable preservation and utilization plan.
Legends and culture surrounding Shikawatari Castle
Legend of the ghost of a warrior
Interesting legends remain at the Shikawatari Castle ruins. Legend says that while strolling along the farm roads surrounding the castle ruins, one might encounter the ghost of a samurai descending from the site of Shikagahana Castle.
Such legends may suggest that the castle was the site of fierce battles and that many samurai lost their lives there. From a folkloric perspective, it is an interesting example of how local memory is passed down in the form of legend.
Origin of the Place Name and Cultural Background
There are several theories regarding the origin of the place name “Shikawatari,” but the most likely explanation is that it was named because the shape of the plateau resembles a deer’s head. The alternative names “Shishigahana” and “Shikagahana” are thought to have similar origins.
In ancient Japan, there was a custom of naming place names by likening the topography to animals. Deer were often treated as sacred animals, so this place name may not only reflect a geographical feature but also have religious significance.
Current Status and Challenges of Shikawatari Castle Research
Results of Academic Research
Regarding Shikawatari Castle, topographical surveys and surrounding area investigations were conducted as part of the Chiba Prefecture Medieval and Early Modern Castle Site Research Report. This research revealed the castle’s scale, structure, and the arrangement of its remains.
In particular, the confirmation of an inner masugata gate and the existence of earthworks with a bent and distorted shape are important discoveries indicating that Shikawatari Castle was constructed using advanced castle-building techniques. These findings are valuable resources for understanding the level of castle construction technology in Shimosa Province during the Sengoku period.
Future Research Topics
Many aspects of Shikawatari Castle remain unclear.
- Identification of the Builder: While it is speculated that the castle was built by the Shikawatari clan, definitive historical evidence is needed to support this.
- Determination of the Construction Date: If dating of excavated artifacts is conducted, a more accurate construction date may be determined.
- The Castle’s Function and Role: Whether it was a subsidiary castle of Usui Castle or a fortified camp of an opposing force needs to be clarified through the discovery of historical documents and comparative research with surrounding castles.
- The Time and Circumstances of Abandonment: The details of when and why the castle was abandoned are unknown.
- The Existence of a Castle Town: Archaeological investigations are needed to determine if there were settlements of samurai or merchants around the castle.
Importance of Preservation
Currently, the Shikawatari Castle ruins are closed off as private land, which conversely protects them from development. However, considering long-term preservation, measures such as designation as a cultural property or public ownership are desirable.
As the castle with the best-preserved remains in Yotsukaido City, and as an important site for understanding the medieval history of Chiba Prefecture, the preservation of the Shikawatari Castle ruins is an essential issue for protecting the region’s cultural heritage.
Kawatari Castle and the Castle Culture of Chiba Prefecture
Characteristics of Medieval Castles in Chiba Prefecture
Chiba Prefecture is known as a treasure trove of medieval castles. Due to its geographical location on the Boso Peninsula, it served as a key point for both maritime and land transportation, attracting many powerful forces to establish bases.
The local powers, centered around the Chiba clan, deployed family members throughout the region, forming a network of castles. Kawatari Castle is believed to have been one of these castles belonging to the Chiba clan, serving as a base for regional control.
Comparison with Other Castles in Chiba Prefecture
Otaki Castle: A strategic point in the southern part of the Boso Peninsula, it became the residence of a daimyo in the early modern period. Its scale and structure differ significantly from Kawatari Castle.
Hon-Sakura Castle: A castle with large earthworks and dry moats, serving as the base of the Chiba clan. It is preserved and maintained as a nationally designated historical site.
Usui Castle: This castle is considered to have the closest connection to Kawato Castle and was built on a strategic location overlooking Lake Inba.
While Kawato Castle is medium-sized compared to these large castles, it possesses a typical structure and scale for a local powerful family’s castle and occupies an important position in the study of medieval castles.
Access and Nearby Attractions
Transportation Access
Access by Train:
- Approximately 20-30 minutes on foot from JR Sobu Main Line “Yotsukaido Station” or “Monoi Station”
- Located midway between the two stations, making it accessible from either station.
Access by Car:
- Approximately 10 minutes from Higashi-Kanto Expressway “Yotsukaido IC”
- Easy to find if you aim for Zenkoji Temple (334 Kawato, Yotsukaido City)
- Zenkoji Temple’s parking lot is available (priority given to worshippers).
Nearby Historical Spots
When visiting Kawato Castle Ruins, we recommend also visiting historical spots in Yotsukaido City and the surrounding area.
Zenkoji Temple: A temple located very close to the ruins of Kawato Castle. Convenient as a starting point for visiting the castle ruins.
Other Castle Ruins in Yotsukaido City: Several castle ruins are scattered throughout the city, including Kide Castle, Nakayama Castle, and Fukuseiji Castle.
Usui Castle Ruins: A large castle site located in Usui, Sakura City. A place worth visiting to consider its relationship with Kawato Castle.
Sakura Castle Ruins Park: The ruins of the early modern Sakura Castle have been developed into a park. The National Museum of Japanese History is also adjacent.
Summary: Historical Value of Kawato Castle
Kawato Castle is a medieval castle site remaining in Yotsukaido City, Chiba Prefecture, possessing many historical value points. Although many aspects of its builder and construction history remain unknown, the well-preserved earthworks, dry moats, and inner masugata gate structures are valuable cultural heritage that convey the castle-building techniques and military ideology of the Sengoku period.
It is believed that Kawato Castle was built by the Kawato clan, a branch of the Usui clan, and it is suggested that it may have functioned as a subsidiary castle of Usui Castle or as a temporary encampment during attacks on Usui Castle. As the castle with the best-preserved remains in Yotsukaido City, it is an indispensable site for understanding the region’s history.
Currently, access is restricted as it is private property, but it is possible to observe its topography and location from the surrounding area. When visiting, please avoid trespassing on private property, be considerate of local residents, and observe proper etiquette during your visit.
We hope that appropriate preservation and utilization will be implemented in the future, allowing many people to experience the historical value of Kawato Castle. Kawato Castle will continue to be an important subject of research for understanding the medieval history of Chiba Prefecture, particularly the sphere of influence of the Chiba clan.
We hope that history enthusiasts and castle fans will rediscover the value of Kawato Castle through documents and reports, and widely spread the importance of its preservation. The understanding and cooperation of each and every one of us is essential to passing on this valuable cultural heritage of the region to future generations.
