Complete Guide to Aki-Takayama Castle (Hiroshima Prefecture): A Thorough Explanation of the Birthplace of the Kobayakawa Clan
Aki-Takayama Castle, located in Hongō-chō, Mihara City, Hiroshima Prefecture, is a medieval mountain castle and a historically important fortress that served as the residence of the Kobayakawa clan for approximately 350 years. Also known as “Tsumatakayama Castle,” “Furu-Takayama Castle,” and “Michiyama Castle,” it is designated a national historic site along with Shin-Takayama Castle, built on the opposite bank of the Numata River. This article will introduce the charm of this magnificent castle in its entirety, from its history, structure, highlights, and visitor guide.
History of Aki-Takayama Castle
Construction and the Development of the Kobayakawa Clan
Aki-Takayama Castle was built in 1206 (Ken’ei 1) by Kobayakawa Shigehira. Kobayakawa Shigehira was the grandson of Doi Tohei and moved from Sagami Province (present-day Kanagawa Prefecture) to Aki Province (present-day Hiroshima Prefecture). He acquired the position of jitō (land steward) of Numata Manor and built Takayama Castle in the area, establishing the foundation of the Kobayakawa clan.
The Kobayakawa clan expanded their power in this area and grew into a powerful local lord in Aki Province. Takayama Castle was built on a mountaintop approximately 190 meters above sea level and functioned as a strategic stronghold overlooking the Numata River basin.
Relationship with Mōri Motonari
A crucial turning point in the history of the Kobayakawa clan was their relationship with Mōri Motonari during the Sengoku period (Warring States period). In 1550, when Kobayakawa Okikage died young, Mōri Motonari’s third son, Takakage, was adopted into the Kobayakawa family.
Kobayakawa Takakage was a powerful general of the Mori clan, leading the Kobayakawa navy and contributing to securing control of the Seto Inland Sea. While Takakage resided at Takayama Castle, he began planning the construction of a new castle around 1552.
Relocation to Shin-Takayama Castle and Abandonment
Seeking a more defensible castle, Kobayakawa Takakage began construction of Shin-Takayama Castle on the opposite bank of the Numata River. Shin-Takayama Castle was situated at an altitude of approximately 330 meters and boasted a larger layout and more robust defensive structures.
With the relocation to Shin-Takayama Castle completed between 1552 and the Eiroku era (around 1552-1570), Takayama Castle, which had served as the Kobayakawa clan’s base for approximately 350 years, ceased its function and was abandoned. However, it has been suggested that it may have maintained some function as a subsidiary or auxiliary castle of Shin-Takayama Castle.
Structure and Layout of Aki Takayama Castle
Overall Layout
Aki Takayama Castle has a distinctive structure, divided into a northern and southern ridge by a valley called “Baba” (horse riding ground). The main enclosures are located on the northern ridge, with the Kita-no-maru, Nino-maru, Honmaru, and Ogi-no-maru arranged in sequence from northwest to southeast.
The elevation difference of the entire castle area is approximately 190 meters, with a tiered defensive line established from the foot of the mountain to the summit. This three-dimensional defensive structure is typical of medieval mountain castles.
Honmaru (Main Enclosure)
The Honmaru is located in the center of the castle and is a flat enclosure measuring approximately 40 meters east-west and 30 meters north-south. Earthen ramparts surround the Honmaru, suggesting that the lord’s residence and important facilities were located there.
From the Honmaru, one can overlook the Numata River basin and Shin-Takayama Castle on the opposite bank, indicating its favorable location as a base for governing the territory. Even today, a clearly defined flat area remains at the site of the main keep, allowing visitors to appreciate its former scale.
Second Bailey and North Bailey
Located northwest of the main keep, the second bailey was the second largest enclosure, and is presumed to have housed the residences of senior retainers and soldiers’ quarters. A moat separated the second bailey from the main keep, strengthening its defensive capabilities.
Further northwest lies the North Bailey, a crucial defensive stronghold protecting the castle’s rear entrance. Several smaller baileys were positioned around the North Bailey, creating a tiered defensive line.
Fan Bailey and Southern Ridge
Located southeast of the main keep, the Fan Bailey, as its name suggests, is a fan-shaped enclosure that protected the main entrance. A steep slope extends from the Fan Bailey, making enemy intrusion difficult.
The southern ridge features numerous small enclosures and vertical moats, providing ample defensive structures to prepare for attacks from the main gate. It has been suggested that the defensive structures on the southern ridge were strengthened around the time of the construction of Shin-Takayama Castle.
Stone Walls and Remains
A notable feature of Aki-Takayama Castle is the presence of stone walls, which are rare for a medieval mountain castle. Around the main keep and second enclosure, sections of stone walls constructed using the “nozurazumi” method (stacking natural stones) remain. These stone walls were likely strengthened during the time of Kobayakawa Takakage and are valuable remains that demonstrate the evolution of castle construction techniques during the Sengoku period.
Furthermore, various remains such as earthworks, moats, vertical moats, and well sites are well-preserved throughout the castle grounds, making it an important historical site for learning about the structure of medieval mountain castles.
Highlights of Aki-Takayama Castle
Value as a National Historic Site
Aki-Takayama Castle, along with Shin-Takayama Castle, is designated as a National Historic Site as “Takayama Castle Ruins.” Aki Takayama Castle is valued for its historical significance as the Kobayakawa clan’s base for approximately 350 years, the excellent state of preservation of its remains that retain the structure of a medieval mountain castle, and its value in the study of medieval castles through comparison with Shin-Takayama Castle.
While many medieval mountain castles exist in Hiroshima Prefecture, Aki Takayama Castle is an important historical site that tells the story of the Kobayakawa clan’s rule over the Numata River basin, making it indispensable for regional history research.
Views and Scenery
The view from the main keep is one of Aki Takayama Castle’s greatest attractions. The panoramic view of the Numata River, Shin-Takayama Castle on the opposite bank, and the surrounding mountains deeply impresses visitors. Especially on clear days, you can see as far as the Seto Inland Sea, allowing you to truly appreciate why the Kobayakawa clan chose this location as their base.
In spring, mountain cherry blossoms bloom, and in autumn, the mountains are colored with autumn leaves, allowing visitors to enjoy the beauty of nature throughout the seasons.
Ascent Routes and Exploring the Ruins
There are several routes to Aki Takayama Castle, but the main route is the path from the main gate to Ogi-no-maru and then to the main keep. Information boards are installed along the path, allowing you to read explanations of each enclosure and the ruins as you ascend.
The ascent takes approximately 30 to 40 minutes one way, but along the way you can observe ruins such as vertical moats, earthworks, and stone walls, allowing you to learn about the structure of a medieval mountain castle. There is also a rear gate route, which goes via Kita-no-maru to the main keep, offering a different perspective on the castle’s defensive structure.
Comparison with Shin-Takayama Castle
When visiting Aki Takayama Castle, it is recommended to visit Shin-Takayama Castle on the opposite bank. The two castles face each other across the Numata River, allowing you to experience the evolution of the Kobayakawa clan’s castle strategy.
While Old Takayama Castle (Aki Takayama Castle) is a relatively compact structure as an early mountain castle, New Takayama Castle is a large-scale mountain castle that utilized the advanced castle-building techniques of the Sengoku period. Comparing the two castles allows us to understand the development of castle architecture from the medieval period to the Sengoku period.
Visiting Guide
Access
Using Public Transportation
The nearest station is JR Sanyo Main Line “Hongo Station”. It’s about a 25-30 minute walk from Hongo Station to the castle entrance. Head northeast from the station and walk along the Numata River to the entrance. There are signs, making it a relatively easy route to follow.
Using a Car
It’s about a 10-minute drive from the Sanyo Expressway “Hongo Interchange”. There is a small parking area near the entrance, but spaces are limited, so be aware of potential congestion. When using a car navigation system, searching for “Takayama Castle Ruins” or “Mihara City Hongo-cho” is convenient.
Important Points for Visiting the Castle
Aki Takayama Castle is a full-fledged mountain castle, and appropriate preparation is necessary for the climb. Please note the following:
- Clothing and Equipment: Wear comfortable clothing and non-slip shoes (trekking shoes recommended). In summer, insect repellent, a hat, and drinking water are essential.
- Estimated Time: Allow approximately 30-40 minutes one way from the entrance to the main keep, and 1.5 to 2 hours round trip. If you wish to carefully observe the remains, more time will be required.
- Weather: The climbing path becomes slippery during and after rain, so it is recommended to avoid visiting.
- Season: In summer, vegetation can be overgrown, making it difficult to see the remains. Late autumn to early spring is the best season for observing the remains.
Points for Visiting
Here are some points for efficiently visiting the castle within a limited time.
- Preparation Before Climbing the Castle: Before starting your climb, familiarize yourself with the overall layout of the castle using the information board at the entrance.
- Observing the Remains: Pay attention to the vertical moats and earthworks along the climbing path. Carefully observe the structure of the stone walls and earthworks in the main keep.
- Checking the View: From the main keep, observe the view of Shintakayama Castle on the opposite bank and the topography of the Numata River basin. Imagine how the Kobayakawa clan governed their territory.
- Photography: The stone walls, earthworks, and view from the main keep are must-see photo opportunities.
Nearby Tourist Spots
Around Aki Takayama Castle, there are numerous historical sites related to the Kobayakawa clan and the Sengoku period.
Shintakayama Castle Ruins
Located on the opposite bank of the Numata River, Shintakayama Castle is a mountain castle built by Kobayakawa Takakage during the Sengoku period. Visiting Aki-Takayama Castle in conjunction with Shin-Takayama Castle allows you to understand the evolution of the Kobayakawa clan’s castle strategy. Shin-Takayama Castle is also designated a National Historic Site, offering a chance to learn about the structure of a larger mountain castle.
Historical Sites Around Hongō-chō
Hongō-chō contains historical sites and temples related to the Kobayakawa clan. Furthermore, the remains of Mihara Castle, built by Kobayakawa Takakage, still exist within Mihara City, allowing for a historical walk tracing Takakage’s footsteps.
Mihara City Historical and Folk Museum
This museum, where you can learn about the history and culture of Mihara City, also features exhibits on the Kobayakawa clan and Aki-Takayama Castle. Visiting before or after your castle visit will provide a deeper understanding.
Cultural Value of Aki-Takayama Castle
Importance in Kobayakawa Clan Research
Aki-Takayama Castle is an indispensable historical site for understanding the development process of the Kobayakawa clan. The Kobayakawa clan, who moved from Sagami Province to Aki Province, are attracting attention from historians as an important archaeological site that tells the story of how they grew into powerful local lords.
In particular, the history of Takakage, the third son of Mori Motonari, being adopted into the family and contributing to the expansion of the Mori clan’s power, is studied as a good example of the realities of political marriages and adoptions during the Sengoku period.
Resources for Medieval Mountain Castle Research
Aki Takayama Castle also provides important resources for studying the structure and construction techniques of medieval mountain castles. From its construction in Ken’ei 1 (1206) to its abandonment during the Tenbun era (1532-1555), the changes in the castle’s fortifications over approximately 350 years can be gleaned from the remains.
In particular, the use of stone walls is noteworthy as a relatively early example for a medieval mountain castle, making it a valuable example of the development of castle construction techniques during the Sengoku period.
Place in Local History
Aki Takayama Castle is an important historical site for understanding the medieval regional governance system in the Numata River basin. The Kobayakawa clan, as the jitō (land steward) of Numata Manor, expanded their power from Takayama Castle and built relationships with surrounding local lords.
The castle ruins allow us to infer the transportation routes, settlement layouts, and agricultural production patterns of the time, providing clues to understanding the realities of medieval regional society.
Significance of Visiting Aki Takayama Castle
Visiting Aki Takayama Castle has significance beyond simply viewing castle ruins. Through the history of the Kobayakawa clan, one can learn about the changes in regional society from the medieval period to the Sengoku period (Warring States period). Furthermore, the experience of climbing the mountain castle allows one to feel firsthand the lives of the people and the realities of warfare at that time.
The view from the main keep allows us to imagine how the Kobayakawa clan viewed this land and what their thoughts were as they managed their territory. Looking out at Shin-Takayama Castle on the opposite bank, contemplating the reasons why Kobayakawa Takakage built a new castle and the attitude of a Sengoku period warlord trying to adapt to changing times is a truly rewarding experience of learning history.
Summary
Aki-Takayama Castle is a nationally designated historical site located in Mihara City, Hiroshima Prefecture. It played an important role as the residence of the Kobayakawa clan for approximately 350 years. Built in 1206 by Kobayakawa Shigehira, it functioned as the Kobayakawa clan’s base until Kobayakawa Takakage, the third son of Mori Motonari, moved to Shin-Takayama Castle.
The castle’s structure is divided into a northern and southern ridge by a valley called Baba, with major enclosures such as the Honmaru, Ninomaru, Kitanomaru, and Ogi-no-maru arranged within it. Unusually for a medieval mountain castle, stone walls remain, and other remains such as earthworks, moats, and vertical trenches are also well-preserved.
When visiting, please prepare comfortable clothing and non-slip shoes, and allow approximately two hours for the round trip. Through the views from the main keep and observation of the ruins, you can truly experience the structure of a medieval mountain castle and the history of the Kobayakawa clan.
Visiting Aki Takayama Castle on the opposite bank in conjunction with Aki Takayama Castle will provide a deeper understanding of the evolution of the Kobayakawa clan’s castle strategy. Aki Takayama Castle is a recommended historical site not only for history enthusiasts but also for mountain castle fans and those who want to enjoy nature.
When visiting Hiroshima Prefecture, be sure to visit Aki Takayama Castle and experience the history of the Kobayakawa clan and the charm of a medieval mountain castle.
