Shogunyama Castle: A Thorough Explanation of Kyoto’s Largest Mountain Castle Ruins and Sengoku Period History
Shogunyama Castle, built on the summit of Uryuyama Mountain in Sakyo Ward, Kyoto City, was a mountain castle that served as the central stage for political turmoil in Kyoto from the late Muromachi period to the Sengoku period. It has several other names, including Shogunyama Castle, Kitashirakawa Castle, Uryuyama Castle, and Shogun Jizoyama Castle, and as its name suggests, it is a historically important castle ruin that experienced numerous battles.
This article provides a comprehensive explanation of this largest mountain castle in Kyoto, covering its detailed history from construction to abandonment, the characteristics of its existing ruins, access methods for visitors, and highlights.
Basic Information and Overview of Shogunyama Castle
Basic Castle Data
Shogunyama Castle is a mountain castle located on Uryuyama Mountain (elevation 301m), stretching from Kitashirakawa Kiyosawa-cho to Ichijoji Matsubara-cho in Sakyo Ward, Kyoto City. This large-scale castle, utilizing the mountainous terrain with a relative elevation of approximately 200 meters, is located northeast of Ginkaku-ji Temple (Jisho-ji Temple) and was built at a strategic point overlooking the Yamanakagoe Pass, an important road connecting Kyoto and Omi Province.
Castle Classification: Mountain Castle
Construction Date: Daiei 7 (1527)
Builder: Hosokawa Takakuni
Main Lords: Hosokawa Takakuni, Ashikaga Yoshiharu, Ashikaga Yoshiteru, Miyoshi Nagayoshi, etc.
Abandonment Date: Around Genki 1 (1570)
Current Status: Forest/Temple Grounds
Major Remains: Enclosures, earthworks, moats, gate remains
About Alternate Names and Names
Katsugun-yama Castle has several alternative names, each with its own origin.
Shogunzan Castle: This is the most common name, originating from the fact that Hosokawa Takakuni enshrined the Shogun Jizo (Victory Jizo) to commemorate his victory in battle.
Kitashirakawa Castle: Named after the Kitashirakawa district where the castle is located.
Uryuyama Castle: Named after the mountain Uryuyama, where the castle was built.
Katsugun Jizoyama Castle: Named after the Victory Jizo enshrined within the castle, strongly indicating its character as a place for praying for victory in battle.
These names are used interchangeably depending on the era and document, but currently, “Katsugunzan Castle” or “Shogunzan Castle” are the most commonly used.
History of Katsugunzan Castle: Turmoil in the Muromachi Shogunate and the Castle’s Transformation
Construction by Hosokawa Takakuni (Daiei 7, 1527)
The history of Katsugunzan Castle begins with Hosokawa Takakuni, who was a Kanrei (deputy shogun) of the Muromachi Shogunate. In 1527, Takakuni built this castle on the summit of Uryuyama Mountain as a military base in Kyoto.
As the head of the Hosokawa Keichō family, Hosokawa Takakuni held real power in the shogunate by supporting Shogun Ashikaga Yoshiharu, but his conflict with his relative Hosokawa Harumoto was intensifying. This conflict, known as the “Rebellion of the Two Hosokawas,” escalated into a conflict that divided Kyoto in two.
Takakuni built the castle on Uryuyama Mountain to serve as a forward base for marches from Ōmi Province to Kyoto. By controlling the Yamanakagoe road, he established it as a strategic base to counter military pressure from the Ōmi region. At this time, Takakuni enshrined a Shōgun Jizō (a guardian deity of victory) to pray for victory, and this became the origin of the castle’s name.
However, in 1531, Hosokawa Takakuni was defeated in battle against the combined forces of Hosokawa Harumoto and Miyoshi Motonaga, and was forced to commit suicide at Tennoji in Settsu Province. After Takakuni’s death, Katsugunyama Castle temporarily came under the control of Harumoto’s faction.
Large-Scale Renovation and Siege by Ashikaga Yoshiharu
After Hosokawa Takakuni’s death, Shogun Ashikaga Yoshiharu initially had a cooperative relationship with Hosokawa Harumoto, who had defeated Takakuni. However, relations between the two gradually deteriorated, and around 1542, they developed into a full-fledged conflict.
Yoshiharu focused on Katsugunyama Castle as his military base in Kyoto and carried out large-scale renovation work. This renovation transformed the castle from a mere temporary encampment into a full-fledged mountain castle capable of withstanding a shogun’s siege. It is believed that large-scale construction work was carried out, including the construction of a wide range of baileys covering the entire Uryuyama mountain, and the reinforcement of earthworks and moats.
In 1547, Miyoshi Nagayoshi, a retainer of Hosokawa Harumoto, led a large army to attack Katsugunyama Castle. Yoshiharu and his son Yoshiteru holed up in the castle and resisted, but they could not withstand the pressure of Nagayoshi’s forces. Ultimately, they set fire to the castle and escaped to Sakamoto in Omi Province.
This battle symbolizes the process of the Muromachi Shogunate’s de facto decline, and from then on, the shogun family was driven out of Kyoto and wandered from place to place in Omi and other regions, leading to a period of instability.
Katsugunyama Castle under the Miyoshi Nagayoshi Regime
Having driven out Ashikaga Yoshiharu and his son Yoshiteru, Miyoshi Nagayoshi established his hegemony in Kyoto. Katsugunyama Castle came under Nagayoshi’s influence and continued to function as an important base for the defense of Kyoto.
In 1559 (Eiroku 2), Shogun Ashikaga Yoshiteru reconciled with Miyoshi Nagayoshi and returned to Kyoto. Even then, Katsugunyama Castle maintained its importance as a strategically important military point in Kyoto.
In 1565 (Eiroku 8), the Miyoshi Three (Miyoshi Nagayoshi, Miyoshi Masayasu, and Iwanari Tomomichi) and Matsunaga Hisahide attacked Ashikaga Yoshiteru at Nijo Palace, killing him in the “Eiroku Incident.” It is believed that Katsugunyama Castle played a certain role in the military tensions surrounding Kyoto both before and after this incident.
Oda Nobunaga’s Entry into Kyoto and the Siege of Shiga
In 1568 (Eiroku 11), when Oda Nobunaga entered Kyoto with Ashikaga Yoshiaki, the political situation in Kyoto changed dramatically. Nobunaga drove out the Miyoshi Three and Matsunaga Hisahide, establishing a new order in Kyoto.
In 1570, the Battle of Shiga took place between Nobunaga and the combined forces of Asai Nagamasa and Asakura Yoshikage. The area around Katsugunzan Castle became a battlefield during this conflict, with Oda generals such as Akechi Mitsuhide and Sakai Masahisa fighting in the region.
After the Battle of Shiga, as military tensions in Kyoto subsided, Katsugunzan Castle lost its strategic importance and is believed to have been abandoned around this time. Oda Nobunaga prioritized bases closer to the plains in his control of Kyoto, making the mountainous Katsugunzan Castle unnecessary to maintain.
The Involvement of Rokkaku Yoshikata and Nagahara Shigesumi
In the history of Katsugunzan Castle, Rokkaku Yoshikata, a Sengoku daimyo of Omi Province, and his retainer Nagahara Shigesumi also played important roles.
Rokkaku Yoshikata was a Sengoku daimyo who controlled southern Omi Province and was deeply involved in the political situation in Kyoto. In the conflicts between the Ashikaga shogunate and the Hosokawa faction, Yoshikata often acted as a mediator while also seeking to expand his own power.
Nagahara Shigesumi was a senior retainer of the Rokkaku clan and played a crucial role in military operations toward Kyoto. Because Katsugunzan Castle controlled the Yamanakagoe Pass, which connected Omi Province and Kyoto, it was recognized as a strategically important point in the Rokkaku clan’s military operations.
In particular, when Ashikaga Yoshiharu holed up in Katsugunzan Castle, Rokkaku Yoshikata’s support was a crucial element, demonstrating the close connection between the Omi forces and the political developments in Kyoto.
Structure and Layout of Katsugunzan Castle
Overall Composition: Four Castle Areas
The most distinctive feature of Katsugunzan Castle is its large-scale layout, which extends over a wide area of Uryuyama Mountain. According to a survey by the Kyoto Prefectural Board of Education, the castle ruins can be broadly divided into four castle areas.
First Castle Area (Main Enclosure): This is the main part of the castle, centered around the main keep located at the highest point of Uryuyama (elevation 301m). Several flat areas, believed to be the remains of a palace where the shogun or castle lord resided, exist here, surrounded by earthen ramparts for defensive purposes.
Second Castle Area (Northern Defense Line): This defensive line extends north of the main enclosure, featuring a group of enclosures designed to defend against incursions from the mountain pass. It is divided by multiple trenches, allowing for a layered defensive structure.
Third Castle Area (Eastern Defense Line): This is the eastern defensive structure, designed to defend against attacks from the Omi region. Utilizing the steep terrain, enclosures and trenches are strategically placed to enhance defensive capabilities.
Fourth Castle Area (Southwest): This is the southwestern defensive line facing Kyoto city, with multiple terraced enclosures constructed on a relatively gentle slope.
Combining these four castle areas, the total area of Katsugunyama Castle reaches a considerable size, making it the largest mountain castle remains in the Higashiyama mountain range.
Characteristics of Major Remains
Kuruwa (Enclosures): Dozens of large and small enclosures have been identified at Katsugunyama Castle. The enclosures in the main enclosure area are relatively large and flat, providing ample space for building structures. On the other hand, the enclosures along the defensive lines are mostly small and are thought to have functioned as lookout or combat facilities.
Dorui (Earthworks): Earthworks surround the main enclosures, and in some places, earthworks over 2 meters high remain in good condition. It is presumed that fences or walls were built on top of the earthworks.
Horikiri (Moat): Moats dug to cut across the ridge have been identified in multiple locations. In particular, the defensive lines on the north and east sides are shown to have been enhanced by double and triple moats. In some places, the depth of the moats reaches over 5 meters.
Koguchi (Fortified Entrance): Multiple remains of koguchi, the entrances to the castle, have been identified. Some exhibit defensive structures such as staggered koguchi and masugata koguchi, demonstrating ingenuity to make enemy intrusion difficult.
Tatebori (Vertical Moat): Several vertical moats, dug vertically into the slopes, have also been confirmed, serving to prevent enemy soldiers from moving horizontally.
The Victorious Jizo and Religious Aspects
A distinctive feature of Katsugunyama Castle is the presence of the Victorious Jizo (Shogun Jizo). This Jizo, enshrined by Hosokawa Takakuni to commemorate his victory, became an object of worship for praying for lasting military fortune.
Currently, a shrine dedicated to the Victorious Jizo stands along the hiking trail on Uryuyama Mountain, making it a popular spot for hikers and castle ruin visitors. It is a valuable historical site that conveys how religious facilities were integrated with military facilities in medieval mountain castles.
It is believed that there were several other religious remains within the castle grounds, indicating a close connection between the faith of Sengoku period warlords and their military actions.
Highlights and Charms of Katsugunzan Castle Ruins
Well-Preserved Remains
The greatest charm of Katsugunzan Castle is the extremely well-preserved remains of a Sengoku period mountain castle. Because Uryuyama Mountain was spared from large-scale development after the castle’s abandonment, the remains such as baileys, earthworks, and moats retain their original appearance.
Especially around the main bailey, clear earthwork lines and flat bailey surfaces can be seen, allowing visitors to experience the castle structure of the Sengoku period. The presence of such a large-scale mountain castle remains so close to Kyoto city is rare, making it a must-see spot for castle enthusiasts.
Stunning Views
From the summit of Uryuyama Mountain, you can enjoy a magnificent panoramic view of Kyoto city. From here, you can see Higashiyama, Mount Hiei, and the entire Kyoto Basin, giving you a real sense of why this area was considered a strategically important military location.
In particular, its position overlooking the Yamanakagoe road clearly demonstrates the strategic intent to monitor and control the transportation route connecting Omi and Kyoto. On clear days, you can even see as far as Osaka, highlighting the importance of having a wide-ranging view.
Hiking Trails
Currently, several hiking trails are maintained to the Katsugunzan Castle ruins, making it relatively easy to access. Starting from tourist attractions such as Shisendo Temple and Tanukidani Fudoin Temple, the trails are well-maintained, allowing you to enjoy both historical and nature walks simultaneously.
However, as it is a mountain castle, appropriate hiking equipment and physical fitness are necessary. Especially during rainy weather and winter, the ground can become slippery, so appropriate footwear and clothing are recommended.
Nearby Historical Spots
Numerous related historical spots exist around Katsugunzan Castle.
Shisendo Temple: A mountain villa built by Ishikawa Jozan, a literary figure of the Edo period, and one of the trailheads to Shogunzan Castle.
Tanukidani-yama Fudōin Temple: A temple located on the mountainside of Shogunzan, situated along the access route to the castle ruins.
Ginkaku-ji Temple (Jishō-ji Temple): A symbolic building of Higashiyama culture, built by Ashikaga Yoshimasa, located southwest of Shogunzan Castle.
Enryaku-ji Temple on Mount Hiei: The head temple of the Tendai sect, visible northeast from Shogunzan Castle, and the center of religious authority in medieval Kyoto.
Visiting these spots together will allow you to gain a more comprehensive understanding of Kyoto’s history from the Muromachi period to the Sengoku period.
Access and Visiting Guide
Access by Public Transportation
Using Kyoto City Bus:
- From Kyoto Station, take City Bus Route 5 and get off at “Ichijoji Shimomatsucho,” then walk approximately 20 minutes to the trailhead.
- From Kyoto Station, take City Bus Route 5 and get off at “Kitashirakawa Shibushicho,” then walk approximately 15 minutes to the trailhead.
- From Keihan Railway “Demachiyanagi Station,” take City Bus Route 5 for approximately 15 minutes.
Using Eizan Electric Railway:
- Get off at Eizan Electric Railway “Ichijoji Station,” then walk approximately 20 minutes to the trailhead.
Main Hiking Routes
Shisendo Route: This is the most common route, starting from behind Shisendo Temple. It is relatively well-maintained and recommended for beginners. Approximately 40-50 minutes from the trailhead to the summit.
Tanukidani-yama Fudoin Route: This route passes through Tanukidani-yama Fudoin Temple, with a Shogun Jizo statue along the way. Approximately 45-60 minutes from the trailhead to the summit.
Kitashirakawa Route: This route from the Kitashirakawa area has some slightly steep sections. Approximately 50-60 minutes from the trailhead to the summit.
Notes for Visitors
- Clothing: Hiking boots or trekking shoes are essential. Sneakers are acceptable, but choose non-slip shoes.
- Items to Bring: Please carry drinking water, a towel, rain gear, and a map or a smartphone with GPS functionality.
- Time: Allow approximately 2-3 hours for the round trip. Plan with ample time to descend before sunset.
- Season: Spring and autumn are ideal. Be aware of the heat and insects in summer, and the possibility of freezing temperatures and snow in winter.
- Solo Activities: It is preferable to visit with multiple people if possible, but if you are going alone, be sure to inform someone of your hiking plan.
Parking Information
There is no dedicated parking lot for the Katsugunzan Castle Ruins. If you use the parking lots at Shisendo Temple or Tanukidani-yama Fudoin Temple, please follow the rules of each facility. Generally, using public transportation is recommended.
Historical Significance and Cultural Value of Katsugunzan Castle
Symbol of the Decline of the Muromachi Shogunate
Katsugunzan Castle is a fortress that symbolizes the process of the decline of the authority of the Muromachi Shogunate. Originally, the shogun should have resided in a flatland residence such as the Imperial Palace or Nijo Castle in Kyoto, but the fact that Ashikaga Yoshiharu was forced to take refuge in a mountain castle clearly demonstrates the weakening of the shogun’s power.
The transformation of Katsugunzan Castle, which served as the stage for conflicts between powerful figures such as Hosokawa Takakuni, Hosokawa Harumoto, and Miyoshi Nagayoshi, and ultimately ended its historical role with Oda Nobunaga’s entry into Kyoto, encapsulates the political dynamism surrounding Kyoto during the Sengoku period.
Importance in Mountain Castle Research
Katsugunyama Castle is an extremely important case study in the research of mountain castles of the Sengoku period. Its large-scale layout, complex defensive system, and long period of use provide a wealth of information for research.
In particular, it possesses unique characteristics that distinguish it from other Sengoku period mountain castles, as it was renovated and used by the shogun himself, giving it a unique position in the study of castle history.
Status of Cultural Property Designation
Katsugunyama Castle Ruins (Kitashirakawa Castle Ruins) are recognized as a cultural property of Kyoto Prefecture and are registered as an archaeological site by the Kyoto Prefectural Board of Education. However, since it has not received national historic site designation, efforts toward future preservation and utilization are expected.
In recent years, with the growing interest in Sengoku period mountain castles, the challenge lies in how to balance the preservation and public access of important archaeological sites like Katsugunyama Castle.
Related Figures and the Flow of Sengoku History
Many prominent figures of the Sengoku period are involved in the history of Katsugunyama Castle.
Hosokawa Takakuni (1484-1531): Head of the Hosokawa Keichō family and Kanrei (deputy shogun) of the Muromachi Shogunate. He built Katsugunzan Castle and played a crucial role in the Hosokawa War.
Ashikaga Yoshiharu (1511-1550): The 12th Shogun of the Muromachi Shogunate. He extensively renovated Katsugunzan Castle and held it during a siege against Miyoshi Nagayoshi.
Ashikaga Yoshiteru (1536-1565): The 13th Shogun of the Muromachi Shogunate. He held Katsugunzan Castle alongside his father, Yoshiharu, and was later killed in the Eiroku Incident.
Hosokawa Harumoto (1514-1563): Head of the Hosokawa Keichō family, who opposed Hosokawa Takakuni. He collaborated with Miyoshi Motonaga and Miyoshi Nagayoshi to defeat Takakuni.
Miyoshi Nagayoshi (1522-1564): A samurai general of the Sengoku period who built a major power in the Kinai region. He attacked Katsugunzan Castle and drove out Ashikaga Yoshiharu and his son Yoshiteru.
Matsunaga Hisahide (1508-1577): A vassal of Miyoshi Nagayoshi, who later became an independent samurai. He was deeply involved in the political situation in Kyoto.
Oda Nobunaga (1534-1582): A Sengoku daimyo who aimed to unify Japan. He fought around Katsugunzan Castle during the Siege of Shiga.
Akechi Mitsuhide (1528?-1582): A vassal of Oda Nobunaga, who fought around Katsugunzan Castle during the Siege of Shiga. He later instigated the Honnoji Incident.
The rise and fall of these figures unfolded on the stage of Katsugunzan Castle, demonstrating its historical importance.
Summary: The Image of Sengoku Kyoto as Told by Katsugunyama Castle
Katsugunyama Castle is a place of historical significance far beyond mere mountain castle ruins. The decline of the Muromachi Shogunate, the internal conflicts of the Hosokawa clan, the rise of the Miyoshi regime, and Oda Nobunaga’s entry into Kyoto—all the political upheavals surrounding Kyoto during the Sengoku period—are etched into the history of this castle.
The large-scale remains spread across Uryuyama Mountain are a valuable cultural heritage that conveys the castle-building techniques and strategic thinking of the time. As a well-preserved mountain castle site close to Kyoto city, it is a highly worthwhile spot for history buffs and castle enthusiasts.
Visiting Katsugunyama Castle today means standing on the site of power struggles that unfolded in Sengoku-era Kyoto, and reliving the sights seen by shoguns and samurai. While enjoying a hike, you can experience a crucial turning point in Japanese history. Katsugunyama Castle, a hidden historical spot in Kyoto, is sure to attract even more attention in the future.
Visiting the ruins of Shogunzan Castle in conjunction with other famous tourist spots such as Shisendo Temple and Ginkaku-ji Temple provides an excellent opportunity to understand the multifaceted history of Kyoto from the Muromachi period to the Sengoku period. The next time you visit Kyoto, be sure to stop by the ruins of Shogunzan Castle.
