Complete Guide to Momochi Tanba Castle | A Thorough Explanation of the Iga Ninja’s Headquarters, Remains, and History
What is Momochi Tanba Castle?
Momochi Tanba Castle is a Sengoku period mountain castle located in Hojiro, Iga City, Mie Prefecture. Also known as “Momochi Fort,” it is known as the headquarters of the Momochi clan, one of the three leading families of Iga-ryu ninjutsu. This castle, the residence of Momochi Tanba-no-kami, who led the Iga ninja along with the Fujibayashi and Hattori clans, is an important historical site indispensable to understanding ninja culture.
Even today, the remains of the castle, such as the high earthen ramparts surrounding the main enclosure, dry moats, and trenches, remain in good condition, making it a valuable place to learn about the structure of a Sengoku period ninja base. The castle ruins are preserved as a forest, allowing visitors to enjoy a historical walk while feeling the atmosphere of the past.
History of Momochi Tanba Castle
Origins and Growth of the Momochi Clan
The Momochi clan is believed to be a branch of the Oe clan, and it is thought that they adopted the name Momochi from the place name “Momoji” in Nabari during the Muromachi period. They successively bore the title of “Momochi Tanba-no-kami” and expanded their power as local lords while maintaining ties with Kofuku-ji Temple (Nara City) in Yamato Province.
Around the Tenbun era (1532-1555), they had established a firm position in southern Iga as a powerful local clan representing Kuwadai. The Momochi clan was not merely the leader of a ninja group, but a member of the Iga provincial lords, deeply involved in the politics and military affairs of the region.
Status as one of the Three Great Iga Ninja
Momochi Tanba-no-kami is known as one of the “Three Great Iga Ninja,” along with Fujibayashi Nagato-no-kami and Hattori Hanzo (the first). During the Sengoku period, Iga Province was a highly independent region, governed by local lords. Within this context, the Momochi clan held power primarily in southern Iga, and was one of the two major forces rivaling the Fujibayashi clan of Tomoda Village.
Because Iga ninjas had a habit of leaving very few written records, many details of the historical facts remain unknown. However, the existence of Momochi Tanba-no-kami is confirmed by multiple historical sources.
The Tensho Iga Rebellion and the Fall of the Fortress
In 1581 (Tensho 9), Oda Nobunaga invaded Iga Province with a large army of approximately 40,000 men, with his second son, Oda Nobuo, as the commander-in-chief. This was the “Tensho Iga Rebellion (Second Tensho Iga Rebellion).”
The local lords of Iga united and resisted the Oda army, but they lost their strongholds one after another due to the overwhelming difference in troop numbers. It is said that Momochi Tanba-no-kami burned down his own residence (fortress) before going into battle. This was a tactic to prevent it from being used by the enemy, and also a manifestation of his resolve to cut off his retreat.
As a result, the Iga local lords were defeated, and Momochi Tanba Castle fell. This battle led to the loss of Iga’s independence, and many ninjas dispersed. There are various theories about what happened to Momochi Tanba-no-kami afterward, including theories of death in battle and escape, but nothing is certain.
Relationship with Momochi Sandayu
Momochi Sandayu, who appears in Edo period storytelling and novels, is a legendary figure depicted as the founder of Iga-ryu ninjutsu. It is believed that the model for this Momochi Sandayu was the real-life Momochi Tanba-no-kami.
However, the name Sandayu does not appear in historical records, and it is highly likely that it is a fictional creation. Nevertheless, there is no doubt that the Momochi clan played a central role in the Iga ninja, and they had a significant influence on the formation of later ninja images.
Structure and Layout of Momochi Tanba Castle
Overall Layout and Location
Momochi Tanba Castle is built on the western end of a hill extending from the east of Kuishiro in Iga City. Located on the ridge extending east from Seiunji Temple, Seiunji Temple itself is said to have been the site of the Momochi clan’s residence. The structure, combining a castle and a residence, is a typical example of the Sengoku period, utilizing both a living space in peacetime and a defensive stronghold in times of conflict.
The castle consists of four enclosures and, while relatively compact, features a layout that emphasizes defensive functions. As befits a ninja base, it is more of a fort-like structure emphasizing mobility and stealth rather than a large-scale castle.
Features of the Main Enclosure
The main enclosure is approximately 300 tsubo (about 1,000 square meters) in shape and surrounded on three sides (excluding the south) by high earthen ramparts. These ramparts still remain today, approximately 2-3 meters high, and are the most prominent remains of Momochi Tanba Castle.
The eastern rampart, in particular, is built higher than the others, and combined with the moat (described later), it shows ingenuity in preventing intrusion from the ridge. The area inside the ramparts is leveled, suggesting that buildings once stood there.
Structure of the Entrance (Koguchi)
The entrance to the main enclosure (koguchi) is located on the south side. While three sides are fortified with earthen ramparts, the south side is open, likely because this direction is a steep slope, providing natural defense.
The structure around the entrance is complex, suggesting it wasn’t a simple entrance but rather incorporated features to delay enemy incursions. An information board is installed at the site, making it easier for visitors to understand the structure.
Dry Moats and Moats
A clear moat remains on the east side of the main enclosure. Moats are defensive structures dug to cut across ridges, serving to block enemy incursions. The moat at Momochi Tanba Castle reaches several meters in depth and is still clearly visible today.
Furthermore, traces of dry moats remain within the castle grounds. These moats are thought to have served not only defensive purposes but also rainwater drainage.
Circular Pond (Training Ground Site)
A circular depression called “Marugataike” (Circular Pond) remains around the castle site. This is said to be the site of a training ground used by ninjas for underwater training and stealth practice.
While it may have actually been a reservoir or fire-fighting water source, it is an interesting remains with a legend unique to a ninja base. Water still occasionally accumulates here, allowing visitors to experience the atmosphere of the past.
Other Enclosures
In addition to the main enclosure, several other enclosures were arranged, each forming a defensive line. Although small in scale, these enclosures are thought to have functioned as lookout posts and locations for reserve troops.
The enclosures were demarcated using the elevation differences of the terrain, and traces of earthworks and small moats can be seen in various places. Overall, it can be said to be a practical layout that made maximum use of the limited terrain.
Relationship between Seiunji Temple and the Momochi Clan
The Momochi Clan’s Family Temple
Seiunji Temple is located west of Momochi Tanba Castle, across the road. This temple is the family temple of the Momochi clan, and the tombs of successive generations of the Momochi clan remain on its grounds. The prevailing theory is that Seiunji Temple itself was the site of the Momochi clan’s residence, forming a structure where the castle and residence were integrated.
The arrangement of placing the family temple adjacent to the residence is typical of powerful clans during the Sengoku period. The temple served as a spiritual pillar, as well as a place for storing documents and as a refuge in emergencies.
The Legend of Shikibu-zuka
Seiunji Temple has a mound called “Shikibu-zuka.” This is a historical site related to a sad legend concerning Momochi Tanba-no-kami’s mistress and wife.
According to the legend, a conflict arose between Tanba-no-kami’s mistress and wife, leading to a tragic end. Shikibu-zuka is said to have been built to commemorate them, and it is an interesting historical site that offers a glimpse into the human side of a ninja’s private life.
The Present-Day Seiunji Temple
The present-day Seiunji Temple is maintained as a quiet temple nestled in the mountains and is an important point of interest when visiting Momochi Tanba Castle. The temple grounds are well-maintained, and visitors can pay their respects at the Momochi clan’s graves.
The area surrounding the temple retains topographical features that are believed to be traces of the former residence, making it an interesting subject for history enthusiasts.
Highlights of Momochi Tanba Castle
1. The Impressive High Earthworks
The greatest highlight of Momochi Tanba Castle is the high earthworks surrounding the main enclosure. The earthworks on the east side, in particular, are remarkably well-preserved, and the continuous walls of earth, 2-3 meters high, are truly impressive. Visitors can climb onto the earthworks, experiencing the perspective of a lookout from that time.
The earthworks are not simply mounds of earth; they were constructed using a technique called rammed earth (hanchiku), and have remained intact for hundreds of years. This high level of technical skill speaks to the power and wealth of the Momochi clan.
2. Clearly Defined Moat
The moat on the east side of the main enclosure is the most clearly preserved defensive structure at Momochi Tanba Castle. This moat, several meters deep and several meters wide, effectively prevented enemies from attacking along the ridge.
Standing at the bottom of the moat, you can appreciate the height of the cliffs on both sides, experiencing the defensive philosophy of a medieval mountain castle.
3. Well-Preserved Enclosures
Several enclosures remain in relatively good condition, allowing you to observe their layout and elevation differences. The flat areas of each enclosure are clearly defined, making it enjoyable to stroll around while imagining the building arrangements.
4. Legendary Ninja Training Grounds
The legendary training grounds, including the circular pond, hold special appeal for ninja fans. Regardless of their actual use, the image of ninjas under the Momochi clan training here evokes a sense of historical romance.
5. Tranquil Forest Environment
The castle ruins are preserved as a forest, offering a quiet environment with few visitors. Enjoying a historical stroll amidst the birdsong and rustling of trees is a unique charm of Momochi Tanba Castle. The atmosphere evokes the stealth of ninjas.
Access Information
Location
Address: Shirotani, Kuwadai, Iga City, Mie Prefecture
Access by Public Transportation
- Nearest Station: Iga Railway “Ueno-shi Station”
- Approximately 15 minutes by taxi from Ueno-shi Station
- Bus service is limited, so checking the timetable in advance is necessary.
Public transportation access is somewhat inconvenient; using a rental car or taxi is recommended.
Access by Car
- Approximately 10 minutes from the Ueno IC exit on the Meihan Expressway
- Accessible via a prefectural road from National Route 163
- Easy to find if you aim for Seiunji Temple
- Parking space is limited, so please park carefully on the shoulder of the road
Castle Entrance and Estimated Time Required
- Approximately 5-10 minutes on foot from near Seiunji Temple to the castle ruins
- Signposts are installed, so you are unlikely to get lost
- Approximately 30 minutes to 1 hour to explore the area around the main enclosure
- Approximately 1 to 1.5 hours including a visit to Seiunji Temple
Points to Note When Visiting
- Comfortable clothing and shoes are essential as it is a forest area
- Insect repellent is necessary in summer
- Be careful as the ground can be slippery in and after rain
- There are no facilities such as toilets or vending machines, so please prepare in advance
- In winter, the sun sets early, so visiting during daylight hours is recommended
Nearby Tourist Spots
Iga-ryu Ninja Museum
This museum, located in the heart of Iga City, specializes in ninjas. Visiting before or after a visit to Momochi Tanba Castle will allow you to gain a deeper understanding of the history and culture of Iga ninjas. The museum features extensive exhibits of ninja house mechanisms and ninja tools.
Ueno Castle (Iga Ueno Castle)
A modern castle built by Todo Takatora, known for its exceptionally high stone walls. Although it’s from a different era than Momochi Tanba Castle, comparing them as castles in the same Iga region is fascinating.
Fujibayashi Nagato-no-kami Residence Site
This is the site of the residence of Fujibayashi Nagato-no-kami, one of the three great Iga ninja. Visiting the base of the Fujibayashi clan, a powerful force alongside the Momochi clan, helps understand the power structure of the Iga ninjas.
Akame Forty-Eight Waterfalls
Located south of Iga City, this scenic spot is also known as a training ground for ninjas. In this naturally rich valley, you can experience the environment in which ninjas actually trained.
Cultural Value of Momochi Tanba Castle
Importance in Ninja History Research
Momochi Tanba Castle holds significant archaeological and historical value as a real ninja base. Because ninjas typically did not leave written records, physical evidence is scarce, making the castle ruins invaluable research material.
Analyzing the structure of defensive facilities such as earthworks and moats provides clues to understanding the military techniques possessed by ninja groups.
Regional Historical Heritage
For Iga City, Momochi Tanba Castle is an important historical heritage site symbolizing ninja culture. It is being preserved and utilized not only as a tourist resource but also as a cultural asset that forms the region’s identity.
Maintenance is carried out by local history enthusiasts and preservation societies, with regular activities such as grass cutting and the maintenance of information boards.
Educational Value
Momochi Tanba Castle is also used as an educational site for learning about the regional society and the true nature of ninjas during the Sengoku period. In school education and lifelong learning settings, opportunities are provided to actually visit castle ruins and learn about history.
Comparing the fictionalized image of ninjas with the historical reality of ninjas makes it an effective teaching tool for developing historical thinking skills.
Visitor Voices and Evaluations
Evaluation from Castle Enthusiasts
Castle enthusiasts highly praise the excellent state of preservation of remains such as earthworks and moats. The high earthworks surrounding the main enclosure, in particular, are recognized academically as a typical example of a medieval mountain castle.
On the other hand, many visitors suggest that prior knowledge of history is beneficial for a deeper understanding, given the limited information boards and explanations.
Evaluation from Ninja Fans
Visitors interested in ninjas appreciate this as a valuable place to visit the actual base of a real ninja. The humanistic legends, such as the Shikibu Mound at Seiunji Temple, are also considered a major draw.
Traditional training grounds, such as the circular pond, are considered interesting clues for imagining the real lives of ninjas.
Evaluation by those seeking a quiet environment
The lack of crowds found in popular tourist destinations, allowing for a peaceful historical stroll, is highly appreciated. The environment, where one can slowly observe the ruins while feeling close to nature in the forest, is suitable for those seeking a tranquil historical exploration.
Future prospects for Momochi Tanba Castle
Challenges in preservation and maintenance
While the remains of Momochi Tanba Castle are relatively well-preserved, managing the vegetation in the forest environment remains an ongoing challenge. Regular mowing and removal of fallen trees are necessary, and cooperation from local preservation societies and the government is essential.
Furthermore, improving signage and explanatory materials, and developing safer viewing paths are future challenges to create a more user-friendly and safer environment for visitors.
Utilization as a tourist resource
Iga City is promoting tourism centered around ninjas, and Momochi Tanba Castle is an important component of this. The development of a sightseeing route in conjunction with other tourist facilities such as the Iga-ryu Ninja Museum and Ueno Castle is anticipated.
New forms of information dissemination are being considered, such as using digital technology to recreate the castle’s past using AR (augmented reality) and providing explanations through smartphone apps.
Research Progress
In the future, archaeological excavations and the discovery of historical documents may reveal new facts about Momochi Tanba Castle and the Momochi clan. Advances in academic research will further enhance the value of the castle ruins and influence the direction of its preservation and utilization.
Summary
Momochi Tanba Castle is a historical site that holds an important position in the history of Japanese ninja, as it was the residence of Momochi Tanba-no-kami, one of the three great ninja of Iga. Although the castle fell during the Tensho Iga Rebellion, the remains of the castle, such as the high earthen ramparts surrounding the main enclosure and the moats, are still well-preserved, allowing us to understand the structure of a ninja base during the Sengoku period.
The integrated structure with Seiunji Temple and the legends of training grounds such as the circular pond are unique attractions of Momochi Tanba Castle. Nestled in a tranquil mountain forest, this castle ruin offers a chance to stroll through a place steeped in historical romance, making it a worthwhile destination for castle and ninja enthusiasts.
When visiting Iga City in Mie Prefecture, be sure to stop by Momochi Tanba Castle and experience the world of real ninjas. There you’ll find a real history of ninjas, unlike anything you might imagine in fiction.
