A Thorough Explanation of the History, Structure, and Highlights of Shigiyama Castle (Minamiaizu Town, Fukushima Prefecture)
Shigiyama Castle, also known as Minamiyama Castle or Tajima Castle, is a medieval mountain castle located in Tajima, Minamiaizu Town, Minamiaizu District, Fukushima Prefecture. Built from the summit to the foot of Mount Atago, the castle is designated a Fukushima Prefecture Historic Site due to its excellent state of preservation, and remnants such as earthworks and stone walls can still be seen today. This article comprehensively explains everything you need to know before visiting Shigiyama Castle, including its detailed history, structure, highlights, and access methods.
Basic Information on Shigiyama Castle
Shigiyama Castle is a medieval mountain castle located in Tajima, Minamiaizu Town, Minamiaizu District, Fukushima Prefecture. The castle ruins are located in the area around Mount Atago, approximately 750 meters above sea level, in the southern part of the current Tajima town area.
Common Names/Alternate Names
- Minamiyama Castle
- Tajima Castle
These alternative names originate from its status as a central castle in the Minamiyama region and its location in Tajima.
Location
Tajima, Minamiaizu-machi, Minamiaizu-gun, Fukushima Prefecture
Under the old provincial name Mutsu Province, it was an important strategic base fortifying Minamiyamaguchi, the southernmost point of the Aizu region and the gateway to Aizu from the Kanto region.
Classification and Structure
- Classification: Mountain Castle
- Structure: Concentric Mountain Castle
- Keep Structure: None (As it is a medieval mountain castle, there is no keep)
- Builder: Naganuma Clan
- Main Lords: Naganuma Clan, Ogura Yukiharu, Naganuma Morihide
- Cultural Property Designation: Fukushima Prefecture Designated Historic Site
History and Background of Shigiyama Castle
Construction and the Naganuma Clan’s Rule
The exact construction date of Shigiyama Castle is unclear, but it is believed to have been built by the Naganuma clan during the Nanboku-cho period. The Naganuma clan was a branch of the Oyama clan of Shimotsuke Province, originating from Naganuma, Haga District, Shimotsuke Province (present-day Naganuma, Mooka City, Tochigi Prefecture).
In 1189 (Bunji 5), the Naganuma clan participated in Minamoto no Yoritomo’s invasion of Oshu and distinguished themselves in battle. As a result of their achievements, they were granted territory in southern Aizu. Following the Mongol invasions, the Naganuma clan ruled the Tajima region of Minami-Aizu and is said to have built Shigiyama Castle there.
Battles during the Muromachi Period
The “Tōji Hachiman-gū Chōchō” (Records of Tōji Hachiman-gū Shrine) records that in Chōroku 4 (1460, or according to one theory, Chōroku 3, 1459), the Yamauchi Etchū (lord of Yokota Castle, the Yamauchi clan) and the Shirakawa clan (lord of Shirakawa Castle) attacked and captured “Shigiyama Castle in Minami-yama.” From this record, it is certain that Shigiyama Castle already existed at least by the mid-15th century.
It is unclear how the Naganuma clan recaptured the castle after this capture, but they continued to maintain their power as influential lords in the Minami-yama region.
The Sengoku Period and Subjugation to the Ashina Clan
At the start of the Sengoku period (Warring States period), the Naganuma clan submitted to the Ashina clan, a powerful daimyo family of Aizu. The Ashina clan controlled a vast territory centered in Aizu, and the Naganuma clan served as important retainers of the Ashina clan, entrusted with governing the Nanzan region.
The Fall of the Ashina Clan and Subjugation to Date Masamune
In 1589 (Tensho 17), the Ashina clan was defeated and destroyed by Date Masamune at the Battle of Suriagehara. At this time, Naganuma Morihide, the lord of Shigiyama Castle, chose to submit to Date Masamune after the Ashina clan’s downfall.
As a result, Shigiyama Castle came under the control of the Date clan, and Naganuma Morihide continued to rule the area as its lord.
The Settlement of Oshu and the Departure of the Naganuma Clan
In 1590 (Tensho 18), Toyotomi Hideyoshi implemented the “Settlement of Oshu.” This policy of national unification resulted in the confiscation of a vast territory, including the Aizu region, from Date Masamune. Naganuma Morihide followed the Date clan and left Nanzan, marking the end of the Naganuma clan’s rule over Shigiyama Castle.
The Era of Gamo Ujisato
After the Settlement of Oshu, Gamo Ujisato took up residence in Aizu. Gamo Ujisato made Aizu-Wakamatsu Castle (Tsuruga Castle) his residence and stationed his retainer, Ogura Yukiharu, in southern Aizu. Ogura Yukiharu entered Shigiyama Castle and was responsible for governing the Nanzan region.
The Uesugi Clan Era and its Aftermath
After the Gamo clan was transferred in 1598 (Keicho 3), Uesugi Kagekatsu took up residence in Aizu. Even during the Uesugi clan’s rule, Shigiyama Castle continued to function as an important base in the Nanzan region.
Later, during the Edo period, Aizu came under the rule of the Gamo clan, and then the Hoshina clan (later the Aizu Matsudaira family). It is believed that Shigiyama Castle ceased to function as a medieval mountain castle and gradually fell into disuse.
Structure
Shigiyama Castle is a typical mountain castle built on the northern edge of Mt. Atago, at an altitude of approximately 750 meters. It is characterized by a structure that skillfully utilizes the natural terrain.
Overall Structure
The total length of the castle extends approximately 700 meters from north to south. Of these:
- Approximately 350 meters at the summit: Defensive structures utilizing the steep slope
- Approximately 350 meters at the foot of the mountain: Living spaces and defensive facilities spread across the gentle slope
From the summit to the foot of the mountain, earthworks, gates, and moats were constructed utilizing the natural terrain such as ridges and valleys, forming a concentric layout.
Major Remains
Honmaru (Main Enclosure)
Located at the summit, the Honmaru is the central enclosure of the castle. Surrounded by earthworks, it functioned as the most strongly defended location.
Ninmaru and Sanmaru
Multiple enclosures were arranged around the Honmaru, forming a tiered defensive line. These enclosures were positioned utilizing ridges and flat areas.
Earthworks
Earthworks remain in various places within the castle grounds and are well-preserved. The earthworks were built to surround the enclosures and served to prevent enemy intrusion. The height varies depending on the location, but the highest points reach several meters.
Moats
Multiple moats, dug to cut across the ridgeline, can be seen. These were constructed to hinder enemy advances and enhance the castle’s defenses.
Vertical Moats
Vertical moats, dug vertically into the slope, can also be observed. Vertical moats restricted the movement of enemy soldiers climbing the slope, creating a favorable battle situation for the defenders.
Main Gate Stone Wall
One of the highlights of Shigiyama Castle is the Main Gate Stone Wall. This stone wall, rare for a medieval mountain castle, is believed to have been located near the castle’s main entrance. Built using the nozurazumi technique, it is a valuable historical structure that conveys the stone-laying techniques of the time.
It has been suggested that this stone wall may have been built when Ogura Yukiharu renovated the castle during the time of Gamo Ujisato. Gamo Ujisato was known as a master of stone wall construction, and it is believed that his influence extended to Shigiyama Castle in Minami-Aizu.
Features of the Castle Layout
The layout of Shigiyama Castle makes maximum use of the steep terrain of the mountaintop. Enclosures are arranged on ridges radiating from the main enclosure, and each enclosure is separated by a moat, creating independent defensive units.
Furthermore, there is a relatively large flat area at the foot of the mountain, where it is presumed that the residences of the retainers and the storehouses were located. The fact that it provided a living space for daily life, despite being a mountain castle, is a structural feature of Shigiyama Castle.
Current Status
The current Shigiyama Castle site is protected as a Fukushima Prefecture designated historical site, and the remains are in excellent condition.
Preservation Status of the Remains
Since the Edo period, Shigiyama Castle has remained as a forest without undergoing large-scale development. Therefore, the remains of the medieval mountain castle are preserved in almost their original state.
- Earthworks: The earthworks surrounding each enclosure are clearly visible, allowing you to confirm their height and shape.
- Moats: Multiple moats cutting across the ridge are in good condition.
- Enclosures: The remains of flat enclosures are clearly identifiable, allowing you to appreciate the scale of the castle.
- Stone Walls: While some parts of the main gate’s stone wall have collapsed, it is a valuable remains that allows you to confirm medieval stonework techniques.
Access Route and Visiting
A well-maintained access route leads to the Shigiyama Castle ruins, allowing you to walk from the foot of the mountain to the summit. While there are some steep sections, the route is generally well-maintained, attracting history enthusiasts and castle fans.
From the summit, you can enjoy a panoramic view of Tajima city, allowing you to imagine the time when the Naganuma clan ruled this area. This view allows you to appreciate the geographical importance of the Nanzan region and the strategic role played by Shigiyama Castle.
Information Boards and Explanations
Information boards are installed within the castle ruins, explaining the history and structure of Shigiyama Castle. Even first-time visitors can understand the castle’s overview while exploring.
Surrounding Facilities
Nearby facilities offering insights into the history and culture of Minami-Aizu are scattered throughout the area surrounding Shigiyama Castle ruins.
Minami-Aizu Town Museum
Located in the town of Tajima, the museum exhibits historical and folk materials of Minami-Aizu. Materials related to Shigiyama Castle are also on display, and visiting before or after your castle ruins visit will provide a deeper understanding.
Tonohetsuri
Located about 20 minutes by car from Shigiyama Castle, “Tonohetsuri” is a scenic spot designated as a national natural monument. It is a gorge with a series of strangely shaped rocks formed by the erosion of the Okawa River (Aga River), and is one of Minami-Aizu’s representative tourist spots. ### Ouchi-juku
Ouchi-juku, a post town that retains the atmosphere of the Edo period, is located about 30 minutes by car from Shigiyama Castle. The scenery along the street, lined with thatched-roof houses, has been designated a National Important Preservation District for Groups of Traditional Buildings, attracting many tourists.
Hisakawa Castle Ruins
The ruins of Hisakawa Castle, believed to have functioned as a subsidiary castle of Shigiyama Castle, also remain within Minami-Aizu Town. Visiting both Shigiyama Castle and Hisakawa Castle provides a more comprehensive understanding of the Naganuma clan’s rule.
Aizu-Tajima Gion Festival
The Aizu-Tajima Gion Festival, held every July, is a traditional event with a history of over 800 years. A festival that has continued since the time of the Naganuma clan, its highlight is the magnificent procession known as the “Shichigyoki Gyoretsu” (Seven-Person Procession). It can be said to be a valuable festival that conveys the culture of the era when Shigiyama Castle flourished.
Access
Here’s how to access the Shigiyama Castle Ruins.
Access by Public Transportation
Train/Bus
- Get off at Aizu-Tajima Station on the Aizu Railway Aizu Line
- Approximately 3 hours 30 minutes by Limited Express Liberty Aizu from Asakusa Station on the Tobu Railway
- Approximately 1 hour by Aizu Railway from Aizu-Wakamatsu Station
- Walking from Aizu-Tajima Station
- Approximately 15 minutes on foot from the station to the entrance to Shigiyama Castle Ruins
- Approximately 20-30 minutes on foot from the entrance to the mountaintop
Access by Car
From Tokyo
- Approximately 1 hour 30 minutes via National Routes 400 and 121 from Nishinasuno-Shiobara IC on the Tohoku Expressway
From Fukushima/Koriyama
- Approximately 1 hour 30 minutes via National Routes 289 and 121 from Shirakawa IC on the Tohoku Expressway
From Aizu-Wakamatsu
- Approximately 1 hour via National Route 121
Parking
There is parking space near the entrance to the Shigiyama Castle ruins, but the number of spaces is limited. It is also possible to access the castle on foot from a public parking lot in Tajima town.
Points to Note When Visiting the Castle
- Clothing: As it is a mountain castle, comfortable walking shoes and clothing are essential.
- Season: Snowfall in winter makes climbing difficult. Visiting from spring to autumn is recommended.
- Time Required: Allow approximately 1 to 1.5 hours round trip from the entrance to the summit.
- Drinking Water: There are no vending machines within the castle grounds, so please prepare drinking water in advance.
- Insect Repellent: In summer, there are many insects, so carrying insect repellent spray is recommended.
Summary of Shigiyama Castle’s Highlights
Shigiyama Castle is a valuable historical site with well-preserved remains of a medieval mountain castle. The following are some of the highlights:
1. Well-preserved earthworks and moats
The earthworks surrounding each enclosure and the moats cutting across the ridges are clearly visible, allowing you to experience the defensive system of a medieval mountain castle.
2. Main gate stone wall
Rare stone wall remains for a medieval mountain castle are preserved here, conveying the castle-building techniques of the time.
3. View from the summit
From the summit, you can enjoy a panoramic view of Tajima city and the mountains of Minami-Aizu, realizing the strategic importance of this location in Minami-Yamaguchi.
4. History of the Naganuma clan
You can learn about the history of the Naganuma clan, who ruled this area for approximately 400 years, starting with Minamoto no Yoritomo’s invasion of Oshu, through the Sengoku period, and ending with Toyotomi Hideyoshi’s pacification of Oshu.
5. Harmony with nature
The castle’s layout, which utilizes the natural terrain unique to mountain castles, creates a beautiful landscape where man-made structures and nature harmonize.
Historical Significance of Shigiyama Castle and Minami-Aizu
Shigiyama Castle is not merely a local castle ruin, but a historical site that occupies an important position in the medieval history of the Tohoku region.
Strategic Importance of Minami-Yamaguchi
Minami-Aizu is located at the entrance to the Aizu Basin from the Kanto region and has long been a crucial transportation hub. Shigiyama Castle functioned as an important military base controlling Minami-Yamaguchi and had a significant impact on the political situation of the Aizu region.
Rule of the Naganuma Clan
The Naganuma clan ruled Minami-Aizu for approximately 400 years, contributing to the development of the region and its cultural advancement. Many of the region’s traditional cultural elements, including the Aizu-Tajima Gion Festival, date back to the Naganuma era.
Situation in Tohoku during the Sengoku Period
The history of Shigiyama Castle is closely intertwined with the rise and fall of powerful daimyo in Tohoku, such as the Ashina, Date, Gamo, and Uesugi clans. The fate of this castle influenced the power structure of the entire Aizu region.
Summary
Shigiyama Castle is a medieval mountain castle remaining in Tajima, Minamiaizu-machi, Fukushima Prefecture. Built by the Naganuma clan, it was a central castle in the Minamiyama region. Well-preserved remains such as earthworks, moats, and stone walls remain, making it a valuable historical site for learning about the structure of medieval mountain castles.
Shigiyama Castle boasts a history spanning approximately 400 years, beginning with Minamoto no Yoritomo’s invasion of Oshu, its relationship with the Ashina and Date clans during the Sengoku period, and ending with Toyotomi Hideyoshi’s pacification of Oshu. Its remains still stand quietly on Mount Atago, speaking of medieval history to visitors.
When visiting Aizu-Tajima, be sure to visit the Shigiyama Castle ruins and experience the history and nature of Minamiaizu. The view from the mountaintop is as beautiful as the landscape the Naganuma clan once saw, and will surely captivate visitors.
