Murayama Castle (Gunma Prefecture) Complete Guide: The Former Residence of Murayama Sado-no-kami, a Vassal of the Soja Nagao Clan
Murayama Castle, located in Motosōja-machi, Maebashi City, Gunma Prefecture, is known as the residence of Murayama Sado-no-kami, who served the Soja Nagao clan during the Sengoku period. Although very few remains today, archaeological excavations are gradually revealing the appearance of this medieval castle, making it a valuable historical site. This article provides a detailed explanation of Murayama Castle’s history, structure, lord, and on-site visit information.
Basic Information on Murayama Castle
Location and Situated Area
Location: Motosōja-machi, Maebashi City, Gunma Prefecture (Some sources also list Ōtomo-machi)
Murayama Castle was built on the flat land between the current “Soyokaze Park” and “Ginnan Park.” It was a flatland castle located in a tributary of the Tone River, and many other castles related to the Soja Nagao clan, such as Aokai Castle, Ōtomo Castle, Yōkaichiba Castle, and Ishikura Castle, are scattered in the surrounding area.
Construction Period and Classification
- Construction Year: Tenbun era (1532-1555)
- Abandonment Year: Unknown (Estimated to be late Sengoku period)
- Castle Classification: Flatland castle
- Remains: None (Moat remains confirmed through archaeological excavation)
History of Murayama Castle
Relationship between the Soja Nagao Clan and the Murayama Clan
The lord of Murayama Castle is said to have been Murayama Sado-no-kami. The Murayama clan were samurai who served the Soja Nagao Clan, a powerful local lord in Kozuke Province, and are thought to have been responsible for the defense and governance of this region.
The Soja Nagao Clan was a branch of the Nagao clan, distinct from the Echigo Nagao Clan, the family of Uesugi Kenshin, and was based around Maebashi (then known as Umayabashi). It is presumed that Murayama Castle functioned as one of the branch castles within the sphere of influence of the Soja Nagao Clan.
The Maebashi Region During the Sengoku Period
During the Tenbun era (1532-1542), the power of the Yamanouchi Uesugi clan, the Kanto Kanrei (governor of the Kanto region), declined, while the influence of the Hojo and Takeda clans increased. The Soja Nagao clan also struggled to maintain their power amidst this turmoil of the Sengoku period.
Murayama Castle, located west of Maebashi Castle (Umayabashi Castle), likely played a role in the defensive line from the Soja area. It is thought to have formed a coordinated defensive network with the surrounding Sokai Castle and Otomo Castle.
Date of Abandonment
While there are no clear records of the year Murayama Castle was abandoned, given that many castles in the Kanto region were abandoned after Toyotomi Hideyoshi’s siege of Odawara in 1590, it is highly probable that it was abandoned around this time.
Structure and Layout of Murayama Castle
Castle Structure Revealed by Archaeological Excavations
Although no remains of Murayama Castle exist today, important information has been obtained from past archaeological excavations.
The investigations revealed moat remains, which shed light on part of the castle’s scale and structure. Combining documentary sources and excavation results, Murayama Castle is estimated to have had the following structure:
Rectangular Residence-Type Layout
Murayama Castle is thought to have been a castle with a main enclosure resembling a rectangular residence and a secondary enclosure surrounding it. This is a typical structure for the castles of local powerful families during the Sengoku period.
- Main Enclosure: The central part where the lord’s residence was located
- Secondary Enclosure: An outer enclosure to defend the main enclosure
- Moat: Separating the main and secondary enclosures and serving a defensive function
Characteristics as a Flatland Castle
Murayama Castle is a flatland castle, not a mountain castle, and its construction took advantage of the flat terrain of the Tone River basin. Flatland castles have the following characteristics:
- Easy to surround with a moat
- Highly habitable for daily life
- Easy to build at strategic transportation points
- Although less defensive than mountain castles, they excel as a center of governance during peacetime
Relationship with surrounding castles
The area surrounding Murayama Castle is home to a concentration of castles associated with the Soja Nagao clan:
- Aokai Castle: A major castle located to the east
- Otomo Castle: A nearby branch castle
- Yokaichiba Castle: A defensive stronghold in the surrounding area
- Ishikura Castle: Also within the sphere of influence of the Soja Nagao clan
These castles are thought to have cooperated with each other, forming a defense network for the Maebashi region.
About the castle lord, Murayama Sado-no-kami
Origin of the Murayama clan
Detailed records of Murayama Sado-no-kami are scarce, but it is certain that he was a samurai who served the Soja Nagao clan. “Sado-no-kami” was an official title, not a title used by actual Sado Province governors, but rather a common name adopted by samurai.
The Role of the Murayama Clan
The Murayama clan is presumed to have been entrusted with governing the area around Motosōja-machi within the vassal group of the Sōja-Nagao clan. As local samurai during the Sengoku period, they likely played the following roles:
- Governing their territory and collecting taxes
- Maintaining local security
- Military mobilization during wartime
- Providing military service to their lord
Current Site of Murayama Castle
Soyokaze Park and Ginnan Park
Currently, the Murayama Castle site is completely urbanized, and no castle remains can be seen on the surface. The location of the castle site is believed to be roughly in the middle of “Soyokaze Park” and “Ginnan Park.”
Both parks are neighborhood parks located within residential areas, equipped with playgrounds and open spaces. Because there are no signs or markers indicating the castle ruins, even history enthusiasts would find it difficult to identify the site on-site.
Status of the Ruins
- Moat: Confirmed during excavation, but currently backfilled.
- Earthwork: Not confirmed.
- Building Remains: Details unknown.
- Stone Walls: Presumed not to have existed.
Access to Murayama Castle
Access by Train and Bus
Nearest Station: JR Joetsu Line “Shin-Maebashi Station”
- Approximately 25-30 minutes on foot from Shin-Maebashi Station
- Approximately 40 minutes on foot from Maebashi Station
Using Bus:
- Take a local bus from Maebashi Station or Shin-Maebashi Station towards Motosōja.
- A few minutes’ walk from the nearest bus stop.
Access by Car
- Approximately 15 minutes from Kan-Etsu Expressway “Maebashi IC”
- Approximately 20 minutes from Kita-Kanto Expressway “Maebashi Minami IC”
Parking: Neither Soyokaze Park nor Ginnan Park has dedicated parking. Please avoid parking on the surrounding streets and use nearby coin-operated parking lots or public transportation.
Address and Map Information
Address: Near 2-chome, Motosōja-machi, Maebashi City, Gunma Prefecture
Since there are no signs indicating the castle ruins at the site, it is recommended to check the location on a map beforehand.
Points of Interest and Estimated Time Required
Average Visit Time
According to visit records from castle enthusiasts, the average visit time to Murayama Castle ruins is approximately 15 minutes. This is because there are few remaining structures, resulting in fewer things to observe on-site.
How to Enjoy Your Visit
Although no remains of Murayama Castle exist, visiting with the following perspectives will provide a fascinating experience:
- Observing the Topography: Imagine how the flat terrain was utilized as a castle site.
- Positional Relationship with Surrounding Castles: Check the location of Murayama Castle on a map, comparing it to castles such as Sokai Castle and Otomo Castle.
- Imagining the Historical Landscape: Visualize the Sengoku period landscape lying beneath the modern residential area.
- Understanding the Excavation Results: Reading excavation reports beforehand will deepen your understanding.
Evaluation by Castle Enthusiasts
While the castle receives relatively low ratings on castle websites such as Kojodan, this is due to the limited remaining structures. However, visiting as part of a “castle tour” of the Soja Nagao clan’s branch castles will provide a deeper understanding.
Nearby Attractions
Nearby Castles
When visiting Murayama Castle, we recommend also visiting the surrounding castles:
Aokai Castle: Located east of Murayama Castle, it was one of the main strongholds of the Soja Nagao clan. While few remains exist, it is a historically significant castle.
Otomo Castle: A subsidiary castle adjacent to Murayama Castle. Also a flatland castle, it played a part in the Soja Nagao clan’s defense network.
Maebashi Castle (Umayabashi Castle): A large flatland castle located in the center of Maebashi City. Currently, it is maintained as Maebashi Park, with some earthworks and moats remaining.
Kanayama Castle: One of Japan’s 100 Famous Castles, located in Ota City. A mountain castle with well-preserved stone walls, it is a representative castle of Gunma Prefecture.
Historical Facilities
Maebashi City Soja Historical Museum: A facility where you can learn about the history of the Soja Kofun Group and the surrounding area. It also has exhibits on the medieval history of the region, including Murayama Castle. Gunma Prefectural Museum of History: Located in Takasaki City, this prefectural museum offers a systematic study of the castle history of Gunma Prefecture.
Preliminary Knowledge for Understanding Murayama Castle
About the Sōja Nagao Clan
The Sōja Nagao clan was a powerful local lord in Kōzuke Province, based around Maebashi (Umayabashi). While a separate lineage from the Nagao clan of Echigo (the family of Uesugi Kenshin), they are believed to share the same Kanmu Taira clan lineage.
During the Sengoku period, while belonging to the Yamanouchi Uesugi clan, they maintained complex diplomatic relations with the Hōjō and Takeda clans.
Sengoku History of Kōzuke Province
The Tenbun era in Kōzuke Province saw the decline of the power of the Kantō Kanrei Yamanouchi Uesugi clan, and Hōjō Ujiyasu’s expansion into the Kantō region. Furthermore, Takeda Shingen from Shinano Province also began to exert influence over Kōzuke Province.
Amidst these circumstances, local lords, including the Soja Nagao clan, engaged in complex political maneuvering for survival. Murayama Castle was built and functioned within this historical context.
Characteristics and Role of Flatland Castles
Flatland castles like Murayama Castle have the following characteristics compared to mountain castles:
Advantages:
- High convenience for daily life
- Easy water supply
- Suitable as a base for governing territory
- Can be built at strategic transportation points
Disadvantages:
- Inferior defensive capabilities compared to mountain castles
- Difficult to withstand sieges by large armies
Many local powerful families during the Sengoku period used flatland castles as their residences in peacetime and fortified themselves in nearby mountain castles during wartime.
Research and Archaeological Excavations of Murayama Castle
Results of Archaeological Excavations
Archaeological excavations have been conducted at Murayama Castle in the past, and traces of moats have been detected. This research has archaeologically proven the existence of Murayama Castle, which had previously only been recorded in historical documents.
The size and shape of the excavated moat allow for estimations of the castle’s defensive structure and scale. However, it is unclear whether a detailed excavation report is publicly available.
Future Research Topics
Many aspects of Murayama Castle remain unclear:
- The exact extent and layout of the castle
- Detailed building arrangements
- The exact time and reason for its abandonment
- The subsequent activities of the Murayama clan
- Its position within the group of branch castles of the Sōja Nagao clan
Future excavations accompanying development in the surrounding area may lead to new discoveries.
Practical Advice for Visiting Murayama Castle
Preparation Before Visiting
- Pre-visit Study: Gain basic knowledge about the Sōja Nagao clan and the Sengoku period history of Kōzuke Province.
- Map Check: Confirm the locations of Soyokaze Park and Ginnan Park using a map app.
- Planning for Nearby Castles: Plan your visit to include nearby castle ruins such as Aokai Castle and Ōtomo Castle.
Points to Note on Site
- There are no signs or information boards indicating the castle ruins.
- The park is a living space for local residents, so please observe proper etiquette while visiting.
- When taking photographs, please be careful not to include houses or people in your shots.
- In summer, there are many insects such as mosquitoes, so insect repellent is recommended.
Recommended Time to Visit
Since no remains are left, there is no particular season that is especially good, but please consider the following points:
- Spring/Autumn: The weather is mild and suitable for strolling.
- Winter: There is little snowfall, but cold weather precautions are necessary.
- Summer: Beware of the heat and insects
Summary: The Historical Value of Murayama Castle
Murayama Castle is a castle site with very few remains today, but it is an important historical site that shows the reality of regional control in Kōzuke Province during the Sengoku period.
As the residence of Murayama Sado-no-kami, who served the Sōja Nagao clan, it functioned as a base for governing and defending the region from the Tenbun era to the end of the Sengoku period. The moat remains confirmed by archaeological excavations are valuable physical evidence that corroborates historical records.
The memories of the Sengoku period lie dormant beneath modern residential areas. By visiting the Murayama Castle ruins, we can imagine the invisible layers of history and reflect on the lives of the people who lived in this land.
When planning a castle tour in Gunma Prefecture, be sure to add Murayama Castle to your list. Even though no remains exist, understanding the role this castle played as one of the branch castles of the Sōja Nagao clan will give you a more three-dimensional view of the Sengoku history of Kōzuke Province.
