Complete Guide to Iizaka Castle (Fukushima Prefecture): A Thorough Explanation of the Castle of the Date Clan and the Site Associated with Iizaka-no-Tsubone
Located in Iizaka-machi, Fukushima City, Fukushima Prefecture, Iizaka Castle, also known as Yuyama Castle and Furudate, is the site of a medieval castle. Currently developed as Furudate Park, it sits on a hill overlooking the Iizaka Onsen hot spring resort. This castle, famous as the birthplace of Iizaka-no-Tsubone, known as a concubine of Date Masamune, will be explained in detail in this guide to its history and charm.
History and Overview of Iizaka Castle
Alternate Names and Location of Iizaka Castle
Iizaka Castle, also known as “Yuyama Castle” and “Furudate,” was built on a river terrace in the northwestern part of the Fukushima Basin, where the Surikami River and Ogawa River merge. This location was a strategically important military point, and at the same time, it offered an excellent vantage point overlooking the Iizaka area, which had long been known as a hot spring resort.
The castle ruins are located in Furudate, Iizaka-machi, Fukushima City. Although not at a high elevation, it possessed a geographical advantage, offering panoramic views of the surrounding plains. Located on a hill overlooking the hot spring town, the castle still retains the charm of a small castle town.
The Founding of the Iizaka Clan and the Construction of the Castle
The history of Iizaka Castle is deeply intertwined with the founding of the Iizaka clan, a branch of the Date clan. According to the “Iizaka Seisui Ki” (Chronicle of the Rise and Fall of Iizaka), the ancestor of the Iizaka clan was Date Shiro Kurōdo Uemon-no-jō Tameie, the fourth son of Date Tomomune.
Tameie distinguished himself in the Ōshū War of 1189 and was granted this land as a reward. It is said that he then resided in this castle and adopted the name Iizaka. This marked the beginning of Iizaka Castle, which subsequently became the residence of successive generations of the Iizaka clan.
As a branch of the Date clan, the Iizaka clan maintained relations with the main Date family while governing this region. The castle was not merely a military base, but also the political and economic center governing the Iizaka area.
The Eiroku Era and Iizaka Ukon-no-Shogen Muneyasu
The Era of Iizaka Muneyasu
Particularly important in the history of Iizaka Castle is the era of Iizaka Ukon-no-Shogen Muneyasu, who resided there during the Eiroku era (1558-1573). Muneyasu was a samurai who served Date Terumune and his son, Date Masamune.
Muneneyasu’s era coincided with the turbulent Sengoku period, during which the Date clan repeatedly engaged in conflicts with surrounding forces. Iizaka Castle is thought to have functioned as an important base protecting the northwestern part of the Date clan’s sphere of influence.
The Relationship Between Iizaka-no-Tsubone and Date Masamune
One of Iizaka Muneyasu’s most important achievements was making his daughter a concubine of Date Masamune. This daughter is known as Iizaka-no-Tsubone (or Iizaka-no-Tsubone).
Iizaka-no-Tsubone was favored by Masamune and held an important position within the Date family. This further strengthened the relationship between the Iizaka clan and the main Date family, and contributed to raising the Iizaka clan’s status. Iizaka Castle became not merely a subsidiary castle, but a castle with special significance due to its deep connection to Masamune.
Records in the “Date Jika Kiroku” (Date Family Records) indicate that in January of Tensho 19 (1591), Date Masamune used Iizaka Castle as an inn (temporary lodging) and held New Year’s celebrations there. This was when Masamune was 25 years old, and the record states that he returned to Yonezawa from Iizaka Castle. This record indicates that Iizaka Castle was an important base for the Date family.
Structure and Remains of Iizaka Castle
Scale and Structure of the Castle
Iizaka Castle was built as a medieval flatland castle. While detailed layout maps do not remain, it is believed to have been a castle utilizing the topography of a river terrace.
The central part of the castle is thought to have been located in the area of the present-day Furudate Park, and it is presumed that defensive structures such as moats and earthworks were arranged around it. In terms of scale, it was not a large-scale castle, but rather likely functioned more as a residence for a local lord.
Current Status of Remains
Unfortunately, very few remains of Iizaka Castle remain. Currently, a portion of the castle site has been developed into Furudate Park, a place of recreation for citizens.
A monument marking the castle site stands within the park, indicating that this is the site of Iizaka Castle. A large information board is also installed in front of the castle site, explaining the history of Iizaka Castle. This information board is an important source of information for visitors to the Iizaka Castle site.
Although the remains themselves are gone, observing the topography allows us to imagine what the castle once looked like. The elevation differences of the terraces and the undulations of the terrain convey the defensive capabilities of a medieval castle.
The Later History of the Iizaka Clan and the Castle’s Abandonment
The Decline of the Iizaka Clan
The Iizaka clan held an important position as a branch of the Date clan, but gradually lost power amidst the turmoil of the Sengoku period. During the time of Date Masamune, the Date clan’s power expanded, leading to changes in the placement of many family members and retainers.
The exact date when the Iizaka clan left Iizaka Castle is unclear, but it is believed that the castle was abandoned during the Edo period, ending its role.
Changes in the Castle Site
After its abandonment, the Iizaka Castle site was used for a long time as farmland and residential land. The castle’s remains gradually disappeared, and its development as a park is a relatively recent development.
As Furudate Park, it has become a popular spot for local residents and a favorite destination for tourists visiting Iizaka Onsen.
Furudate Park Today
Park Facilities and Environment
Furudate Park is currently a lush, green public park. It features plazas and walking paths, serving as a place for local residents to stroll and enjoy recreation.
The park offers views overlooking the Iizaka Onsen town. Especially during cherry blossom season, the park is bustling with visitors enjoying the blossoms and serves as a local gathering place.
Castle Ruins Monument and Information Board
A stone monument marking the site of Iizaka Castle stands within the park, conveying the historical importance of this location. A large information board in front of the castle ruins provides detailed explanations about the history of Iizaka Castle and the Iizaka clan.
These facilities allow visitors to learn about the history of Iizaka Castle, making it a place of value beyond just a park.
Relationship with Iizaka Onsen
Hot Spring Town and Castle Town
Iizaka Town, where Iizaka Castle is located, has long been known as a hot spring resort. Iizaka Onsen is counted as one of the three most famous hot springs in Oshu and has been enjoyed by many people since ancient times.
Iizaka Castle is located on a hill overlooking this hot spring town, and it is thought to have played a role in controlling and protecting the hot spring area. The slope leading from the hot spring town to the castle ruins still conveys the atmosphere of the former castle town, and one can feel the structure of a castle town, albeit a small one.
Value as a Tourist Resource
Currently, the Iizaka Castle Ruins are positioned as one of the tourist resources of Iizaka Onsen (hot spring resort). Many tourists visiting the hot springs also visit the castle ruins while strolling around, making it possible to combine hot springs and history in a sightseeing experience.
The hot spring town has several public baths and inns, and combining a stroll through the castle ruins with a soak in the hot springs allows for a more fulfilling sightseeing experience.
Related Historical Sites in the Surrounding Area
Relationship with Otori Castle
In addition to Iizaka Castle, Iizaka Town also has the ruins of Otori Castle (Tateyama Castle). Otori Castle was located north of Iizaka Castle, in the area now developed as Tateyama Park.
Otori Castle is also considered to be a castle related to the Iizaka clan, and its relationship with Iizaka Castle is being studied. There are various theories regarding the relative locations and division of roles of the two castles, but it is an important historical site for understanding the sphere of influence of the Iizaka clan.
Otori Castle Ruins retain the form of a mountain castle, located at an altitude of 230m and a relative height of 120m. While Iizaka Castle was a flatland castle, Otori Castle is believed to have been a more defensive fortress built in a more mountainous location.
Other Surrounding Historical Sites
There are other historical sights around Iizaka Onsen. The hot spring town is dotted with old public baths, shrines, and temples, making it a great place to enjoy a historical stroll.
Furthermore, modern tourist facilities such as Iizaka Onsen Hana Momono Sato and Palce Iizaka are also abundant, creating a tourist destination where history and modernity blend seamlessly.
Access Information
Access by Public Transportation
To reach Iizaka Castle Ruins (Furudate Park) using public transportation, the following routes are convenient:
Access by Train:
- Get off at “Iizaka Onsen Station” on the Fukushima Kotsu Iizaka Line, approximately 10 minutes on foot
- Approximately 20 minutes from JR Fukushima Station on the Iizaka Line
From Iizaka Onsen Station to the castle ruins, you will walk through the hot spring town and up a slope. Along the way, you can enjoy the atmosphere of the hot spring town, and there are guide signs.
Access by Car
Access by Car:
- Approximately 10 minutes from the Tohoku Expressway “Fukushima Iizaka IC”
- Accessible via Prefectural Road from National Route 13
Regarding parking, there is limited space around Furudate Park. It is also possible to use the public parking lot at Iizaka Onsen and visit on foot from there.
Address and Map Information
Address: Furudate, Iizaka-machi, Fukushima City, Fukushima Prefecture
Since the castle ruins are adjacent to a residential area, consideration for local residents is necessary when visiting. It is recommended to focus your visit on the areas developed as a park.
Points to Note and How to Enjoy Your Visit
Points to Note When Visiting the Castle Ruins
When visiting the Iizaka Castle Ruins, paying attention to the following points will allow you to experience history more deeply.
- Carefully Read the Information Board: The large information board in front of the castle ruins contains detailed information about the history of Iizaka Castle and the Iizaka clan. It is recommended to read this first to gain background knowledge.
- Observing the Topography: Although no remains exist, observing the topography and elevation differences of the river terraces allows you to understand the ingenuity of the castle’s location.
- Enjoying the View: From the park, you can overlook the Iizaka Onsen hot spring town and the surrounding mountains. Let your imagination wander and wonder what the castle lord saw from this spot.
- Checking the Castle Site Monument: The castle site monument in the park is an important memorial indicating that this is a historical site.
Combining a Visit with Hot Springs
A visit to the Iizaka Castle ruins alone can be completed in about 30 minutes to an hour. Therefore, a sightseeing plan that combines a visit with a soak in the Iizaka Onsen hot springs and a meal is recommended.
Recommended Sightseeing Plan:
- Arrive at Iizaka Onsen Station
- Stroll through the hot spring town to the Iizaka Castle Ruins
- Visit the castle ruins at Furudate Park
- Return to the hot spring town and enjoy a bath at a public bathhouse
- Enjoy a meal and buy souvenirs in the hot spring town
This plan allows you to fully enjoy the history and hot springs of Iizaka over half a day to a full day.
Best Seasons for Visiting
While the Iizaka Castle Ruins are accessible year-round, the following seasons are particularly recommended:
- Spring (April): The park is bustling with cherry blossom viewers during the cherry blossom season. Enjoy sightseeing that combines hot springs and cherry blossom viewing.
- Autumn (October-November): The autumn foliage is beautiful, and the atmosphere of the hot spring town is even more pronounced.
- Winter (December-February): Hot springs amidst a snowy landscape are exceptional. The snowy view from the castle ruins is also charming.
Historical Significance of Iizaka Castle
Importance in the Study of the Date Clan
Iizaka Castle is an important historical site for studying the history of the Date clan. As the base of the Iizaka clan, a branch of the Date clan, it provides valuable information for understanding the expansion of the Date clan’s power and the relationships within the family.
In particular, the relationship with Date Masamune through Iizaka-no-Tsubone is a good example of the ties between a Sengoku daimyo and his family and vassals, and provides clues to understanding the political and social structure of the time.
Position in Local History
In the medieval history of northern Fukushima Prefecture, Iizaka Castle played an important role as a base for regional control. Controlling an area with economic value as a hot spring resort is thought to have been a factor supporting the Iizaka clan’s economic base.
Currently, the castle ruins are part of the region’s identity and are cherished by local residents as an important element showing the historical background of Iizaka Onsen.
Materials and Research on Iizaka Castle
Major Literary Sources
The following are major literary sources on Iizaka Castle:
- “Iizaka Seisui Ki” (Record of the Rise and Fall of Iizaka): This historical document records the history of the Iizaka clan and is an important source for understanding their rise and fall.
- “Date Jike Kiroku” (Records of the Date Family): This is the official record of the Date family, including records of Masamune’s visit to Iizaka Castle.
- Various Local Histories: Descriptions of Iizaka Castle can also be found in local histories from the Edo period to the modern era.
Archaeological Investigations
While large-scale excavations have not been conducted at the Iizaka Castle site, small-scale investigations have been carried out in conjunction with development in the surrounding area. These investigations have sometimes yielded medieval artifacts, providing evidence for the existence of the castle.
Further detailed investigations may shed more light on the structure and scale of Iizaka Castle.
Summary: The Charm of Iizaka Castle
Iizaka Castle is not a castle site with large-scale remains, but it is an important historical site deeply connected to the history of the Date clan. As the birthplace of Iizaka-no-Tsubone, a concubine of Date Masamune, and as the residence of the Date clan, this castle holds a special place in the medieval history of Fukushima Prefecture.
Currently, the Iizaka Castle ruins have been developed into Furudate Park, a place of relaxation for local residents. Standing on a hill overlooking the hot spring town, you can imagine the view seen by the former lords of the castle and reflect on history.
When you visit Iizaka Onsen, be sure to extend your trip a little and visit the Iizaka Castle ruins. At this place where the history of the hot springs and the history of the castle intersect, you will be able to experience the rich history and culture of Fukushima. The history of the Iizaka clan, which can be learned through the information boards and castle monuments, vividly conveys the image of a local lord during the Sengoku period.
Even though the remains are gone, the history etched into this land will never disappear. Iizaka Castle ruins, as a precious place connecting the past and the present, will continue to convey the weight and charm of history to many people for years to come.
