Tsuda Castle (Osaka Prefecture) Complete Guide: The Ruins of the Kunimiyama Mountain Castle Destroyed by Oda Nobunaga and the History of the Tsuda Clan
What is Tsuda Castle?
Tsuda Castle (Tsuda-jo) was a medieval mountain castle located in Tsuda, Hirakata City, Osaka Prefecture. Also known as “Kunimiyama Castle (Kunimiyama-jo),” it was built on the summit of Kunimiyama (Tsudayama), at an altitude of 286.5 meters. Situated in a strategic location near the border of Kawachi, Yamato, and Yamashiro provinces, it was a historically important fortress that served as the battleground for powerful figures of the Sengoku period, such as Miyoshi Nagayoshi, Matsunaga Hisahide, and Oda Nobunaga.
Currently, the castle ruins are preserved as a historical site by Hirakata City and are maintained as a hiking course, making it popular not only with history enthusiasts but also with citizens who enjoy nature. Its location, accessible on foot from Tsuda Station on the JR Katamachi Line (Gakken Toshi Line), is another attractive feature.
History of Tsuda Castle
Construction and Development by the Tsuda Clan
Tsuda Castle is believed to have been built around 1490 (Entoku 2), by Tsuda Suō-no-kami Masanobu. The Tsuda clan rose to prominence as a newly emerging local lord, and established the castle on Kunimiyama Mountain as their base of operations in this region.
There are several theories regarding the origin of the castle’s name, but the most likely explanation is that it was also called “Kunimi Castle” because the castle was built on high ground from which they could overlook their territory. The Tsuda clan maintained their power in this area for approximately 100 years, spanning four generations.
Relationship with Miyoshi Nagayoshi
During the Sengoku period (Warring States period), the Tsuda clan became subordinate to Miyoshi Nagayoshi, who built a powerful force in the Kinai region. Nagayoshi was a Sengoku period daimyo who based himself at Iimoriyama Castle (present-day Daito City and Shijonawate City, Osaka Prefecture) and controlled the entire Kinai region, including Kyoto.
Tsuda Castle functioned as a subsidiary castle of Iimoriyama Castle and played a role as a defensive base in northern Kawachi Province. The Tsuda clan, as subordinates of Nagayoshi, are believed to have contributed to the stability of this region.
Conflict between the Miyoshi Three and Matsunaga Hisahide
When Miyoshi Nagayoshi died in 1564, the situation in the Kinai region changed dramatically. A conflict arose between the Miyoshi Three (Miyoshi Nagayoshi, Miyoshi Masayasu, and Iwanari Tomomichi) and Matsunaga Hisahide over control of the Miyoshi family.
During this period, Tsuda Masatoki, the lord of Tsuda Castle, is said to have sided with Matsunaga Hisahide. Enraged by this, the Miyoshi Three attacked Tsuda Castle, and Masatoki was driven out. This incident significantly weakened the Tsuda clan’s power.
Conquest by Oda Nobunaga and the Downfall of the Tsuda Clan
In 1575, Oda Nobunaga, who had advanced into the Kinai region, was eliminating resistance forces. Tsuda Castle became a target and fell to Nobunaga’s army. In this battle, the Tsuda clan lost their home castle and were temporarily ronin (masterless samurai).
Afterward, there is a theory that Tsuda Masatoki was pardoned by Toyotomi Hideyoshi, returned to his former territory, and built Honmaruyama Castle. However, when the Honnoji Incident occurred in 1582, Masatoki sided with Akechi Mitsuhide and followed him. When Mitsuhide was defeated at the Battle of Yamazaki, the Tsuda clan declined again and completely lost their power in the region.
Layout and Structure of Tsuda Castle
Location and Topographical Characteristics
Tsuda Castle is built on the summit of Mount Kunimi, which is part of the western extension of the Ikoma Mountains. Located at the northern end of the mountain ridge extending from Mount Katano, it was a strategically important point near the border of the three provinces of Kawachi, Yamato, and Yamashiro.
From the summit, one can see the Yodo River basin and the direction of Kyoto, a location truly befitting its name, “Kunimi” (meaning “view of the country”). This topographical advantage is thought to be one of the reasons why the Tsuda clan built their castle in this location.
Arrangement of Enclosures
Tsuda Castle has multiple enclosures (kuruma) arranged in a stepped pattern around the mountaintop. The main enclosure is at the summit, and the enclosures unfold in a stepped pattern along the slope, a typical structure for a mountain castle.
Earthworks surround the enclosures on the east, west, and south sides, enhancing their defensive capabilities. Interestingly, there are almost no defensive structures on the north side. This is presumed to have functioned as a natural stronghold due to the steep terrain on the north side.
Defensive Structures
In addition to earthworks, defensive structures such as trenches and vertical moats have been confirmed. However, no permanent structures such as stone walls have been found, strongly retaining the characteristics of a medieval mountain castle, which primarily relied on civil engineering works.
Furthermore, there is a theory that a mountain temple originally existed on this site, and it has been suggested that existing facilities may have been repurposed for military use. It is also thought that when used by the Miyoshi Three and Matsunaga Hisahide, it may have functioned as a temporary encampment (jinjiro).
Connection to the Tsubai Documents
Tsuda Castle also appears in a group of ancient documents called the “Tsubai Documents.” The Tsubai Documents are documents supposedly created by Tsubai Masataka, a scholar of Japanese classics during the Edo period, but recent research has revealed that many of them are forgeries.
However, when compared with actual historical facts, some of the descriptions of Tsuda Castle in the Tsubai Documents reflect a certain degree of historical accuracy. Therefore, how to evaluate the Tsubakii Documents is an important issue when studying the history of Tsuda Castle.
Current Status of Tsuda Castle Ruins
Development as a Hiking Course
Currently, Kunimiyama Mountain is developed as a hiking course and is popular with locals and mountain climbing enthusiasts. The path from the trailhead to the summit is relatively gentle, making it an easy course even for beginners.
Local students often use it as a training course, and it is also utilized as a place for health promotion. In spring, the cherry blossoms are beautiful, and in autumn, the autumn leaves are vibrant, allowing visitors to enjoy nature throughout the seasons.
Current Status of Remains
Remnants of baileys and earthworks remain at the summit, allowing a glimpse of the castle’s former appearance. However, due to years of weathering and overgrown vegetation, the parts that can be clearly identified as remains are limited.
Information boards and explanatory signs are installed in some places, ensuring that visitors can learn about the history of Tsuda Castle. The city of Hirakata is also working on preserving the historical site, and further development is expected.
The Appeal of the View
The view from the mountaintop is magnificent; on a clear day, you can see the Osaka Plain and the Kyoto area. The castle lords of the Sengoku period likely watched the developments in their territories while gazing at this view.
This view is the origin of the name “Kunimi-yama” (国見山), and speaks to the strategic value of Tsuda Castle.
Access Methods
Access by Public Transportation
The nearest station to Tsuda Castle ruins is Tsuda Station on the JR Katamachi Line (Gakken Toshi Line). The trailhead is about a 15-minute walk east from the station. There are signs around the station, so even first-time visitors can easily find their way.
From Osaka Station, transfer to the Katamachi Line at Kyobashi Station and arrive at Tsuda Station in about 40 minutes. Access from the Kyoto area is also possible via Kyotanabe Station.
Access by Car
For those traveling by car, the Katano-Kita or Katano-Minami Interchanges on the Daini Keihan Expressway are convenient. It takes approximately 10 minutes from the interchange to reach the area around Tsuda Station.
However, there is no dedicated parking near the trailhead, so we recommend using coin-operated parking lots around Tsuda Station or using public transportation.
Hiking Time
The time required from the trailhead to the summit is approximately 30-40 minutes at a normal pace. Including the descent, it’s advisable to allow 1.5 to 2 hours round trip.
The hiking trail is well-maintained, but wearing athletic shoes or hiking boots is recommended. Bringing water and snacks will allow you to enjoy a leisurely rest at the summit.
Nearby Attractions
Iimoriyama Castle Ruins
The Iimoriyama Castle Ruins, which have a close connection to Tsuda Castle, are another historical site worth visiting. Known as the residence of Miyoshi Nagayoshi, it was selected as one of the “Continued Top 100 Japanese Castles” in 2017. It’s about a 20-minute drive from Tsuda Castle.
Kono-san
Kono-san, which stretches south from Kunimi-yama, is also a popular hiking spot. At the summit is a giant rock called “Kannon-iwa,” and it’s known as a sacred site for Shugendo (mountain asceticism).
Hirakata-juku
Hirakata-juku, which flourished as a post town during the Edo period, is another highlight. Historical streetscapes remain, and there are museums and facilities utilizing old buildings. It’s just a few stops from Tsuda Station on the Keihan Railway.
Points to Note When Visiting Tsuda Castle
Clothing and Equipment
When visiting mountain castle ruins, comfortable clothing and non-slip shoes are essential. Particular caution is needed after rain, as the hiking trails can become slippery. Insect repellent spray in summer and warm clothing in winter are also recommended.
Safety Considerations
Avoid hiking alone; it’s recommended to visit with multiple people if possible. While cell phone reception is available in many areas, it’s a good idea to inform family and friends of your hiking plans just in case.
Observing Etiquette
The castle ruins are valuable cultural assets. Please be mindful not to damage the remains or litter. Also, since you may pass through private property, consideration for local residents is important.
Historical Significance of Tsuda Castle
Tsuda Castle is one of the castles that symbolizes the power struggles in the Kinai region during the Sengoku period. The history of the Tsuda clan, caught in the conflicts of powerful figures of the era such as Miyoshi Nagayoshi, Matsunaga Hisahide, and Oda Nobunaga, tells the story of the rise and fall of local lords.
Furthermore, its location at the border of Kawachi, Yamato, and Yamashiro provinces meant it remained a crucial transportation and military hub from ancient times to the early modern period. Learning about the history of Tsuda Castle provides important clues to understanding the history of the Kinai region.
Currently, the castle ruins are a popular recreational area for citizens, but understanding the history behind it will allow for a deeper appreciation of Tsuda Castle’s value.
Currently, the castle ruins are a popular recreational spot for citizens, but knowing the history behind it will allow for a deeper understanding of its value. ## Summary
Tsuda Castle (Hirakata City, Osaka Prefecture) is a mountain castle built around 1490 by Tsuda Suo-no-kami Masanobu. Located on the summit of Mount Kunimi, it is also known as “Kunimiyama Castle.” Ruled by the Tsuda clan for approximately 100 years, the castle was deeply connected to important figures of the Sengoku period, such as Miyoshi Nagayoshi, Matsunaga Hisahide, and Oda Nobunaga. It played a crucial role at the strategic border of Kawachi, Yamato, and Yamashiro provinces until its destruction by Nobunaga in 1575.
Currently, it is a popular hiking trail enjoyed by locals, and its convenient location, accessible on foot from JR Tsuda Station, is a major draw. The view from the summit is magnificent, allowing visitors to experience the scenery seen by the castle’s lords of yesteryear. Remains such as stepped baileys and earthworks also exist, making it a valuable historical site for learning about the structure of medieval mountain castles.
For history buffs, it’s an important place to understand the political situation in the Kinai region during the Sengoku period, and for hiking enthusiasts, it’s an attractive spot where you can enjoy nature and history at the same time. As a hidden gem of Osaka Prefecture, why not pay it a visit?
