Maruyama Castle (Toyono District, Osaka Prefecture) Complete Guide | The Base of the Settsu Minamoto and Nose Clan and Highlights of the Castle Ruins
What is Maruyama Castle?
Maruyama Castle is a medieval mountain castle located in Jiko, Nose-cho, Toyono-gun, Osaka Prefecture. This castle, which flourished as the center of Nose District in Settsu Province, was an important base for generations of the Nose clan, descendants of the Settsu Minamoto clan. Situated on a remnant hill called Maruyama, at an elevation of 278m and a relative height of approximately 40m, at the tip of a ridge jutting out northwest of Jiko, it played a crucial role in the expansion of the Nose clan’s power as a transportation hub facing the road connecting Settsu to Tanba Province.
It is also known by other names such as “Jiko Ancient Castle,” “Tennomaru,” “Shiroyama Castle,” and “Nose Castle,” and occupies an important position in the history of the region. Even today, the remains of the main enclosure, outer baileys, dry moats, and vertical moats are well-preserved, making it a valuable historical site for understanding the structure of medieval mountain castles.
Basic Information on Maruyama Castle
Location: Jio, Nose-cho, Toyono-gun, Osaka Prefecture
Castle Classification: Hilltop Castle/Mountain Castle
Elevation: 278m (Relative Height approx. 40m)
Year of Construction: Chogen era (1028-1037)
Builder: Minamoto no Yorikuni (Nose Yorikuni)
Lord: Nose clan
Year of Abandonment: Estimated to be during the Keicho era (1596-1615)
Remains: Main enclosure, outer bailey, dry moat, vertical moat, earthworks, trenches
Designated Cultural Property: Not designated
History and Background of Maruyama Castle
Construction during the Chogen era and the establishment of the Nose clan
The history of Maruyama Castle dates back to the Chogen era (1028-1037) in the late Heian period. The Nose clan’s origins are traced back to Minamoto no Yorikuni, son of Minamoto no Yorimitsu of the Settsu Minamoto clan, who entered this area, a crucial transportation hub connecting Settsu and Tanba, and built a castle. Yorikuni established this location as his base, changed his surname to Nose, and successive heads of the Nose clan resided in this castle.
The geographical importance of this region was a key factor in Minamoto no Yorikuni’s adoption of the Nose name. Located in the northern part of Settsu Province, near the border with Tanba Province, it was a vital point on the transportation routes connecting the two provinces. Furthermore, the surrounding area was covered in farmland, making it suitable for establishing an economic base.
Development of the Nose Clan in the Middle Ages
Throughout the Middle Ages, the Nose clan expanded its power with Maruyama Castle as its base. As a branch of the Settsu Minamoto clan, the Nose clan established its own sphere of influence in northern Settsu Province. Particularly during the Muromachi period, they maintained relationships with powerful shugo daimyo such as the Hosokawa clan, establishing themselves as influential local lords. The following factors contributed to the Nose clan’s long-term maintenance of power:
- Geographical Advantage: Control of the transportation route connecting Settsu and Tanba
- Economic Base: Abundant arable land and forest resources
- Strategic Location: Balancing defensive capabilities as a mountain castle with influence over the plains
- Diplomatic Ability: Building appropriate relationships with the powerful figures of the time
Trends in the Sengoku Period
With the arrival of the Sengoku period, the Nose clan sought survival through their relationships with powerful surrounding daimyo. During this period, Settsu Province became a region where the powers of the Miyoshi, Oda, and Araki clans were intricately intertwined, but the Nose clan maintained their territory through skillful diplomacy.
During the Tensho era (1573-1592), it is believed that the Nose clan also built a relationship with the Oda clan during Oda Nobunaga’s unification of the Kinai region. Subsequently, after the era of Toyotomi Hideyoshi, they came under the control of Tokugawa Ieyasu during the Keicho era.
Transition to the Early Modern Period and Abandonment of the Castle
During the Keicho era (1596-1615), the Nose clan continued to exist as hatamoto (direct retainers of the Tokugawa shogunate) under the Tokugawa shogunate’s system. It is believed that Maruyama Castle was abandoned during this period due to policies such as the “One Castle Per Province” decree. While the Nose clan continued to rule the Nose region, their residence was moved to the plains, and Maruyama Castle ceased to function as a mountain castle.
After its abandonment, the Maruyama Castle ruins were neglected for a long time, but in recent years, they have been re-evaluated by castle researchers and local history enthusiasts, attracting attention as a valuable relic of a medieval mountain castle.
Structure and Remains of Maruyama Castle
Characteristics of the Castle Layout
Maruyama Castle is a typical mountain castle built on the tip of a hill extending southward. It is characterized by a layout that skillfully utilizes the natural terrain while combining artificial defensive structures. Although the castle area is relatively compact, the strategic placement of moats and vertical trenches creates an effective defensive system.
The basic structure of the castle is such that the central main enclosure is located at the highest point, surrounded by a series of outer baileys. To the north, there is an earthen embankment and a dry moat, with further baileys positioned beyond to prepare for attacks from the north. The northern ridge is blocked by a large moat, demonstrating a defensive measure against enemy intrusion.
Main Enclosure (Honmaru)
The main enclosure is the central part of Maruyama Castle, located at the highest elevation. It is believed that the lord’s residence and command post were located here. While the main enclosure is relatively small, the surrounding outer baileys enhance its defensive capabilities.
The flat surface of the main enclosure is still clearly visible, allowing us to imagine the layout of the former buildings. Details are unknown as no archaeological excavations have been conducted, but it is possible that foundation stone buildings or post-and-beam buildings existed here.
Outer Baileys
One level below the main enclosure, outer baileys surround the area. The outer bailey was an important defensive structure for the main enclosure, preventing the enemy from directly attacking it. It is also thought to have been used as a place to station soldiers and store supplies.
The width of the outer bailey varied depending on the location, but was generally several meters. It remains clearly visible as a topographical feature today, providing important clues for understanding the castle’s structure.
Dry Moats and Vertical Moats
The dry moats and vertical moats are particularly noteworthy defensive features of Maruyama Castle. A large dry moat was constructed on the north side of the castle, playing a crucial role in preventing attacks from the north. This dry moat still retains its depth and width, demonstrating the advanced civil engineering techniques of the time.
Vertical moats were dug along slopes to prevent the enemy from climbing the slopes and attacking. Multiple vertical moats have been identified at Maruyama Castle, indicating that the castle’s defensive system was meticulously planned.
Earthworks
Earthworks were constructed around the main enclosure and other baileys. Earthen ramparts are defensive structures built by piling up earth, serving to protect against enemy arrows and bullets. It’s also possible that fences or walls were built on top of the ramparts.
Some sections of the ramparts still remain today, and their height and shape allow us to infer their original appearance.
Moat
A large moat is located on the northern ridge. A moat is a ditch dug across a ridge, designed to prevent enemies from approaching the castle along the ridge. The moat at Maruyama Castle is deep, indicating its effectiveness as a defensive structure.
This moat is particularly impressive among the remains of Maruyama Castle and is a must-see for visitors.
Highlights of Maruyama Castle
Experience the Layout of a Medieval Mountain Castle
The biggest highlight of Maruyama Castle is the opportunity to actually walk through and experience the layout of a medieval mountain castle. From the main enclosure to the outer baileys, dry moats, vertical moats, and trenches, the major remains of the castle are well-preserved, allowing visitors to stroll around and imagine the castle’s appearance in its heyday.
In particular, the large trench on the northern ridge is highly regarded among castle enthusiasts as a testament to the advanced civil engineering techniques of the medieval period. Witnessing the deeply excavated trench will leave you impressed by the hard work and technical skill of the castle’s builders.
Touching the History of the Nose Clan
Maruyama Castle was the base of the Nose clan, descendants of the Settsu Minamoto clan, for several hundred years, starting from the Chogen era. The Nose clan remains deeply connected to the Nose region today, and Maruyama Castle can be considered the origin of their history.
Visiting the castle ruins allows you to understand how the Nose clan established themselves in this area and expanded their power. Furthermore, many historical sites and temples related to the Nose clan remain within Nose town, and visiting them together will allow you to learn more about the Nose clan’s history.
Views and Natural Environment
Maruyama Castle is located on a hill 278 meters above sea level, and the main enclosure offers panoramic views of the surrounding area. Its location overlooking the transportation route connecting Settsu and Tanba gives a real sense of why the castle was built in this spot.
Furthermore, the area surrounding the castle ruins is blessed with a rich natural environment, allowing visitors to enjoy the scenery of each season. Especially during the fresh greenery of spring and the vibrant autumn foliage, visitors can enjoy a stroll through the castle ruins amidst beautiful nature.
Information Boards and Explanations
Information boards are installed at the castle ruins, allowing visitors to learn about the history and structure of Maruyama Castle. Even first-time visitors can deepen their understanding of the castle by referring to the information boards.
However, since the number of information boards is limited, reading materials about Maruyama Castle beforehand will make for a more fulfilling visit.
Access to Maruyama Castle
Access by Public Transportation
When visiting Maruyama Castle by public transportation, the nearest stations are Myokenguchi Station or Yamashita Station on the Nose Railway Myoken Line. However, since the castle ruins are some distance from the station, you will need to use a bus or taxi.
If using Hankyu Bus:
- Take a Hankyu bus from Myokenguchi Station or Yamashita Station
- Get off at the “Jiō” bus stop
- From the bus stop, it’s about a 20-30 minute walk to the castle ruins.
Public transportation is limited, so we recommend checking the timetable in advance. Also, the path to the castle ruins is a mountain trail, so please wear comfortable shoes and clothing.
Access by Car
Access by car is the most convenient.
From Osaka:
- Take the Hanshin Expressway Ikeda Line and exit at “Ikeda Kibe,” then head north on National Route 173
- Approximately 30 minutes towards Nose Town
From Kyoto:
- Take National Route 477 or National Route 173 to Nose Town
Parking
There is no dedicated parking lot around the castle ruins, but there is space for a few cars to park in wide areas along the roadside. However, consideration must be given to avoiding obstructing other traffic. Also, consideration for local residents is important, such as avoiding parking on farm roads during agricultural work season.
Ascent Route
The most common route to the castle ruins is via a mountain path from the Jiko settlement. Since some parts of the trail are not well-maintained, please note the following:
- Comfortable walking shoes (trekking shoes recommended)
- Long-sleeved shirt and long pants (to protect against vegetation and insects)
- Carry drinking water
- Take precautions against heatstroke in summer
- Pay attention to sunset times in winter
The time required to ascend to the castle is approximately 15-20 minutes one way from the foot of the mountain to the main enclosure. Including time spent exploring the castle ruins, it’s advisable to allow 1-2 hours in total.
Nearby Attractions
Nose Myokenyama
Nose Myokenyama, a representative tourist spot in Nose Town, is approximately 20 minutes by car from Maruyama Castle. Known as a sacred site of the Nichiren sect, it also has deep ties to the Nose clan. The view from Mount Myoken is magnificent, offering a panoramic view of the Osaka Plain.
Nose Local History Museum
This facility allows you to learn about the history and culture of Nose Town. There are also exhibits related to the Nose clan, and visiting before or after visiting Maruyama Castle will allow you to gain a deeper understanding of the region’s history.
Noma’s Great Zelkova Tree
This is a giant zelkova tree designated as a national natural monument. Estimated to be over 1000 years old, it has watched over the history of Nose and is a symbol of the region.
Joruri Theater
Nose Town is also a region where the tradition of Joruri (traditional Japanese narrative music) remains. The Joruri Theater regularly holds performances, allowing you to enjoy traditional Japanese performing arts.
Points to Note When Visiting Maruyama Castle
Safety Precautions
Maruyama Castle is not a developed tourist site, but rather the ruins of a mountain castle. Please note the following points when visiting:
- Safety underfoot: Some parts of the mountain path are slippery.
- Animal damage prevention: Beware of wild boars, venomous snakes, etc.
- Weather: The path is especially slippery during and after rain.
- Solo travel: Visiting in groups is recommended if possible.
- Mobile phone: There are areas with poor cell phone reception.
Manners and consideration
The area around the castle ruins is also a residential area for local residents. Please observe the following etiquette when visiting:
- Avoid trespassing on private property
- Always take your trash with you
- Do not make loud noises or disturb agricultural work
- Do not damage plants or historical remains
Recommended Visiting Times
Maruyama Castle is accessible year-round, but the following times are especially recommended:
- Spring (March-May): Beautiful fresh greenery and mild weather
- Autumn (September-November): Enjoy the autumn foliage and moderate temperatures
Summer (June-August) is overgrown with vegetation and has many insects, so adequate precautions are necessary. Winter (December-February) has early sunsets, so please allow ample time for your visit.
Research and Preservation of Maruyama Castle
Academic Evaluation
Maruyama Castle is attracting attention from castle researchers as a typical example of a medieval mountain castle in Settsu Province. In particular, its long-term function as the Nose clan’s base and its strategic location on a key transportation route connecting Settsu and Tanba provinces are considered academically important.
Recent castle research has involved the creation of layout maps and detailed surveys of the remains, accumulating valuable data for understanding the structure and evolution of medieval mountain castles.
Current Status and Challenges of Preservation
Although Maruyama Castle is not currently designated as a cultural property, it is recognized as an important historical site in the region. However, budgets and personnel for maintenance and preservation are limited, and the state of preservation of the remains is not always good.
The following are some of the challenges for the future:
- Preservation of the ruins: Measures against natural collapse and overgrowth of vegetation
- Academic research: Implementation of archaeological excavations and detailed surveys
- Cultural property designation: Establishment of a legal basis for preservation
- Public awareness: Dissemination of information to local residents and visitors
- Improved access: Development of a safe viewing environment
Engagement with the local community
In Nose Town, efforts are being made to revitalize the town by utilizing local historical heritage, including Maruyama Castle. Activities such as cleaning the castle ruins by local volunteers and holding history lectures are being carried out, increasing local residents’ interest in history.
Summary
Maruyama Castle (Nose Town, Toyono District, Osaka Prefecture) is a medieval mountain castle built during the Chogen era by the Nose clan, who were descendants of the Settsu Minamoto clan, and served as their base for several hundred years. Built on a hill 278m above sea level with a relative height of approximately 40m, the castle boasts well-preserved remains including the main enclosure, outer baileys, dry moats, vertical moats, and trenches, making it a valuable historical site for understanding the structure of medieval mountain castles.
Located at a strategic point of transportation connecting Settsu and Tanba, the Nose clan expanded their power from this castle. Although abandoned during the Keicho era after the Sengoku period, the castle remains are still clearly visible, allowing visitors to imagine its former appearance.
While access to Maruyama Castle is convenient by car, it is also accessible by public transport. The castle ruins include unmaintained mountain paths, so appropriate equipment and preparation are necessary. When visiting, it is important to prioritize safety and respect local residents.
Besides Maruyama Castle, Nose Town offers many other attractions, such as Nose Myokenyama and the Noma Great Zelkova Tree. A visit to Maruyama Castle serves as a starting point for enjoying Nose’s rich history and nature.
For anyone interested in medieval mountain castles, wanting to learn about the history of the Nose clan, or simply wanting to explore the history of northern Osaka Prefecture, Maruyama Castle is a must-see historical site. Be sure to visit this historic castle ruin and experience the history of the Settsu Minamoto clan and the allure of a medieval mountain castle.
