Complete Guide to Sendai Castle: The History and Highlights of Aoba Castle Built by Date Masamune
What is Sendai Castle?
Sendai Castle (Sendai-jo, old kanji: 仙臺城) is a flatland castle located on Aobayama in Aoba-ku, Sendai City, Miyagi Prefecture, Japan. Also known as “Aoba Castle,” it was built during the Keicho era by Date Masamune, the first lord of the Sendai Domain. Built on Aobayama, approximately 130 meters above sea level, this castle, protected by cliffs to the east and south, served as a natural stronghold for approximately 270 years, acting as the residence of successive generations of the Date clan and functioning as the administrative center of the 620,000-koku Sendai Domain.
In the summer of 2003, it was designated a national historic site, and is now a popular tourist spot representing Sendai City. The equestrian statue of Date Masamune standing on the site of the main keep is a symbol of Sendai, and it is also known as a scenic spot offering panoramic views from the city to the Pacific Ocean.
History of Sendai Castle
Construction History and Background
Construction of Sendai Castle began in December of Keicho 5 (1600), immediately following the Battle of Sekigahara. Date Masamune decided to relocate his base from his previous residence, Iwadeyama Castle. This decision was driven by his relationship with Tokugawa Ieyasu, his tense relationship with the Uesugi clan, and the potential of Sendai as a political and economic center in the new era.
Masamune chose Sendai because the terrain of Aobayama was a natural stronghold, making it easy to defend and difficult to attack; the Hirose River functioned as a natural moat; and the expansive plains were suitable for the development of a castle town. The layout was planned in December of Keicho 5, and full-scale construction began in January of the following year.
Construction and Completion
Construction of Sendai Castle began in January 1601 (Keicho 6) and is believed to have been largely completed in 1602 (Keicho 7). The fact that it was built in such a short period of time—approximately two years—demonstrates the high level of technology and manpower available at the time.
Interestingly, this castle did not have a main keep (tenshu). This is believed to have been a political consideration to avoid attracting the attention of Shogun Tokugawa Ieyasu. Instead of a main keep, the main enclosure (honmaru) housed a large hall and a palace, functioning as a place for administrative affairs and residence.
Sendai Castle in the Edo Period
Throughout the Edo period, Sendai Castle continued to function as the residence of successive generations of the Date clan. During the time of the second lord, Date Tadamune, the second enclosure (Ninomaru) was constructed, and many subsequent lords resided there. The main enclosure (Honmaru) was used for ceremonies and important administrative affairs, remaining a symbolic presence of the castle.
The castle suffered damage, including the collapse of stone walls, during the great earthquake of 1673, but was repaired each time. Such battles against natural disasters are an important part of Sendai Castle’s history.
Changes After the Meiji Restoration
After the Meiji Restoration, with the abolition of the feudal domains and the decree abolishing castles, Sendai Castle ceased to function as a castle. While the castle was affected by the Boshin War during the Meiji Restoration, its main structures were initially preserved.
However, a fire in 1882 destroyed major structures such as the main hall of the inner citadel. Subsequently, army facilities were established on the castle site, and during the 1945 air raid on Sendai, valuable structures such as the remaining main gate and side turrets were destroyed.
After the war, the castle site was developed into a park, and the Sendai City Museum opened in 1964. In 1967 (Showa 42), the side turret was restored through private donations, and it remains the only restored structure today.
Structure of Sendai Castle
Overall Layout
Sendai Castle is a flatland castle composed of the Honmaru (main keep), Ninomaru (second bailey), and Sannomaru (third bailey). The Honmaru was located on the summit of Aobayama Mountain, with the Ninomaru on the flat land to the east, and the Sannomaru further east.
The Honmaru was located at an altitude of approximately 130 meters, with a cliff facing the Hirose River to the east and a steep cliff to the south, functioning as a natural stronghold. Stone walls were built on the west and north sides to further enhance its defenses.
Structure of the Honmaru
The Honmaru was the core area of Sendai Castle, covering approximately 20,000 square meters. The Honmaru contained palace buildings such as the Great Hall, the Reception Hall, and the Imperial Chamber, functioning as a place for government affairs and ceremonies.
On the north side of the main enclosure (Honmaru) stands a magnificent stone wall approximately 17 meters high. This “North Wall Stone Wall of the Main Enclosure” remains today and is one of Sendai Castle’s greatest attractions. The imposing presence of this wall was so remarkable that a Spanish delegation declared it “one of Japan’s strongest and finest castles.”
At the eastern end of the main enclosure was a stage tower, whose view was said to rival that of Kyoto’s Kiyomizu Temple. Currently, a statue of Date Masamune on horseback stands here, overlooking the city of Sendai.
Second and Third Enclosures
The second enclosure (Ninmaru) was located east of the main enclosure, around the present-day Sendai City Museum and International Center. It was constructed in 1638 by the second lord, Date Tadamune, and served as the residence of subsequent lords. In addition to the lord’s residence, the second enclosure contained buildings for administrative affairs and gardens.
The San-no-maru (third bailey) extended further east from the Nino-maru (second bailey), and was lined with the residences of the domain’s high-ranking officials. Part of present-day central Sendai city corresponds to this San-no-maru.
Characteristics of the Stone Walls
The stone walls of Sendai Castle are remarkable for their scale and construction techniques. The stone wall of the north wall of the main bailey is approximately 17 meters high and 100 meters long, built using the Nozura-zumi technique. This technique involves stacking natural stones as they are, and it is a valuable historical relic that conveys the castle-building techniques of the Keicho period.
The stone materials used in the stone walls are mainly andesite quarried from the Aobayama area. Some of the stones weigh several tons, demonstrating the advanced stone transportation technology of the time.
The structure of the stone walls also incorporates features for drainage. Small stones called Guriishi (crushed stones) were packed inside the walls, creating a system for efficiently draining rainwater.
Otemon Gate and Turret
The Otemon Gate, the formal entrance to the main keep, was located in the northwestern part of the keep. It was a turret gate measuring 12 bays (approximately 21.6 meters) in length and 3 bays (approximately 5.4 meters) in width, its imposing presence reflecting the castle’s status. Unfortunately, it was destroyed in the air raids of 1945, but its appearance can be seen from old photographs and records.
The Wakiyagura (side turret) was located east of the Otemon Gate and served to prevent intrusion into the main keep. The Wakiyagura, restored in 1967, is a faithful wooden reproduction, and its interior can be viewed.
Archaeological Materials and Excavation Surveys
Results of Excavation Surveys
Continued excavation surveys by the Sendai City Board of Education are gradually revealing the true nature of Sendai Castle. Excavations at the main keep site have uncovered foundation stones of palace buildings, stone-built drainage ditches, and garden remains.
A particularly important discovery is the detailed layout of the main keep palace. Excavations have confirmed the location and size of the main hall and reception rooms, and by comparing them with historical records, it has become possible to create more accurate reconstruction drawings.
Excavated Artifacts
Numerous artifacts have been unearthed during the excavations. Among the ceramics, many high-quality items from the period, such as Seto, Mino, Karatsu, and Imari ware, were found, indicating that items befitting the lord’s residence were used.
Furthermore, numerous roof tiles, including gold-leaf tiles and shachi (mythical fish-like creature) tiles, have been unearthed, attesting to the building’s splendor. The gold-leaf tiles, in particular, are important evidence of the high status of the main palace.
Among the weapons and armor unearthed, sword fittings, firearm parts, and arrowheads have been found, providing clues to the castle’s military aspects.
Investigation of the Stone Walls
Detailed investigations of the stone walls are also ongoing. The structure of the stone walls, the origin of the stones used, and the construction techniques are being scientifically analyzed, revealing the history of restoration from the Keicho period through the Edo period.
In particular, the damage to the stone walls caused by earthquakes and the traces of repairs provide valuable information for understanding the disaster response techniques of the time. It has been confirmed that some parts of the stone walls were reinforced with a stronger construction method during repairs after the great earthquake of 1673 (Kanbun 13).
Restoration and Development
Restoration of the Side Turret
The side turret, restored in 1967 (Showa 42), was made possible by private donations. The restoration aimed for the most faithful reproduction possible, based on old photographs, measured drawings, and historical documents.
The side turret is a two-story wooden structure, with the first floor built on top of the stone wall. Inside, materials related to Sendai Castle are displayed, allowing visitors to learn about the castle’s history. More than 50 years have passed since its restoration, and it is now preserved as a valuable wooden reconstructed building.
Development of the Main Enclosure Site
The main enclosure site has been developed into a park and is open to citizens and tourists. From the site of the main keep, where the equestrian statue of Date Masamune stands, you can enjoy a panoramic view of Sendai city, and on clear days, you can even see the Pacific Ocean.
Following its designation as a National Historic Site in 2003, a more comprehensive preservation and development plan is underway. Based on the results of archaeological excavations, efforts continue to pass on the historical value to future generations while balancing the preservation and utilization of the remains.
Development of Aobayama Park
The Aobayama area, including the Sendai Castle ruins, has been developed as Aobayama Park. Cherry trees are planted along the road leading to the main keep site, making it a popular spot for cherry blossom viewing in spring.
Within the park is the Sendai City Museum, which exhibits materials related to the Date family and the history of Sendai. Furthermore, the Aoba Castle Historical Museum displays CG reconstructions and models of Sendai Castle, allowing visitors to experience its appearance in its heyday.
Current Landscape and Highlights
Equestrian Statue of Date Masamune
The equestrian statue of Date Masamune, standing on the site of the former main keep, is widely known as a symbol of Sendai. Erected in 1964, this statue, approximately 5.6 meters tall, depicts Masamune on horseback.
The statue stands where a stage tower once stood, offering an excellent viewpoint overlooking the city of Sendai. It is illuminated at night, creating a magical atmosphere.
Stone Wall of the North Main Keep
The stone wall of the north main keep is one of Sendai Castle’s greatest highlights. This magnificent stone wall, approximately 17 meters high and 100 meters long, showcases castle-building techniques from over 400 years ago.
Looking up at the stone wall from below, one is overwhelmed by its power and the high level of craftsmanship. The rough-hewn stone walls, while utilizing the natural shapes of the stones, form a strong overall structure, demonstrating the high level of skill of the stonemasons of the time.
Otemon Gate Ruins
The Otemon Gate was destroyed in the air raids of 1945, but its foundation stones and stone walls remain. Standing before the Otemon Gate ruins, one can imagine the magnificent turret gate that once stood here.
Information boards are installed around the Otemon Gate ruins, allowing visitors to learn about its former appearance through old photographs. The stone steps leading from the Otemon Gate to the main keep also remain as they were, allowing one to feel the weight of history.
Hirose River and Cliffs
The east and south sides of Sendai Castle face cliffs along the Hirose River. This natural fortification played a crucial role in the castle’s defense. Even today, the view from the cliffs is spectacular, with the clear waters of the Hirose River and the surrounding greenery creating a beautiful landscape.
A promenade is maintained along the Hirose River, allowing visitors to look up at the stone walls of Sendai Castle from the riverbank. The view of the stone walls from this angle is also exceptional, allowing you to truly appreciate the castle’s strength.
Sendai City Museum
Located on the site of the second bailey, the Sendai City Museum is a facility that introduces the history and culture of Sendai, focusing on materials related to the Date family. It houses approximately 90,000 items, including national treasures and important cultural properties. The permanent exhibition displays armor and letters of Date Masamune, as well as materials related to the history of the Sendai domain.
Remains of the second bailey can be seen around the museum building, including the garden ruins and stone walls.
Access and Tourist Information for Sendai Castle
Access Method
To reach the Sendai Castle ruins, the “Loople Sendai” sightseeing city loop bus from Sendai Station is convenient. It takes approximately 20 minutes from Sendai Station to the “Sendai Castle Ruins” bus stop. Loople Sendai is a sightseeing bus that circulates around major tourist spots in Sendai City, and using a one-day pass allows for efficient sightseeing.
If traveling by private car, it’s approximately a 15-minute drive from the Sendai-Miyagi Interchange on the Tohoku Expressway. A paid parking lot is available at the site of the main keep.
Points to Note During Your Visit
We recommend allocating at least one hour for your visit to the Sendai Castle ruins. Including a stroll around the main keep, viewing the stone walls, taking a commemorative photo with the equestrian statue of Date Masamune, and visiting the Aoba Castle Historical Museum, two hours would allow for a more leisurely and enjoyable experience.
If you also plan to visit the Sendai City Museum, it’s advisable to add another one to two hours. The museum’s exhibits are comprehensive, offering a deeper understanding of the history of Sendai Castle and the Date family.
Seasonal Attractions
The Sendai Castle ruins offer unique charm throughout the seasons. In spring, it’s known as a famous cherry blossom viewing spot, with the cherry blossoms on Aoba Mountain in full bloom. Summer brings lush greenery and a pleasant cool breeze; autumn boasts beautiful autumn foliage; and winter, the snow-covered stone walls create a magical atmosphere.
The view at sunset is particularly spectacular, offering stunning night views of Sendai city.
Cultural Value of Sendai Castle
Position in the History of Japanese Castles
Sendai Castle holds a significant place in the history of Japanese castles as a representative example of early modern castles built during the Keicho period. While lacking a main keep, its layout, which maximizes the use of the natural terrain, and its magnificent stone walls represent the pinnacle of castle-building technology at the time.
The fact that a main keep was not built, due to political considerations, is historically significant as it symbolizes the relationship between daimyo and the shogunate in the early Edo period.
Symbol of Date Culture
Sendai Castle was the center of “Date culture,” established by Date Masamune. Masamune was known not only as a military commander but also as a man of culture, deeply knowledgeable in tea ceremony, Noh theater, calligraphy, and painting, and Sendai Castle served as a stage for these cultural activities.
The Date culture nurtured at Sendai Castle became the cultural foundation of Sendai, and is the origin of present-day Sendai, the “City of Trees.”
Regional Identity
Sendai Castle is a symbol of regional identity for the citizens of Sendai. The equestrian statue of Date Masamune is widely recognized as a symbol of the city, and many songs and literary works, such as “Aoba Castle Love Song,” have been created with Sendai Castle as their theme.
Every year, various events are held at the Sendai Castle ruins, providing a place for citizens and tourists to share history and culture.
Efforts for Preservation and Utilization
Preservation as a Historic Site
Since its designation as a national historic site in 2003, the city of Sendai has been focusing on the preservation and utilization of the Sendai Castle ruins. Continuous archaeological excavations are conducted to clarify the actual state of the remains, and appropriate preservation measures are taken.
Regular inspections and necessary repairs are carried out to preserve the stone walls. Structural surveys and strength measurements of the stone walls are also conducted to minimize damage from natural disasters such as earthquakes.
Educational Activities
The Sendai City Board of Education is also focusing on educational activities utilizing the Sendai Castle ruins. They regularly hold tours for elementary and junior high school students in the city, as well as on-site explanations of archaeological excavations, providing opportunities to learn about local history.
Furthermore, a comprehensive volunteer guide service is available, conveying the history and charm of Sendai Castle to visitors.
Utilization of Digital Technology
In recent years, the restoration and dissemination of information about Sendai Castle using digital technology has also progressed. Videos recreating the appearance of Sendai Castle in its heyday using CG technology have been produced and are on display at the Aoba Castle Historical Museum and other locations.
In addition, an app using AR (augmented reality) technology has been developed, enabling new forms of historical experience, such as overlaying the original buildings onto the site via smartphones.
Summary
Sendai Castle is a historically important fortress, a natural stronghold built by Date Masamune, which functioned as the center of the 620,000-koku Sendai Domain for approximately 270 years. With its distinctive structure lacking a main keep, magnificent stone walls, and a layout that utilizes the natural terrain, Sendai Castle occupies an important position in the history of Japanese castles, representing the pinnacle of castle construction technology during the Keicho period.
Currently preserved as a national historic site, it is a popular tourist attraction representing Sendai City. The equestrian statue of Date Masamune standing on the site of the main keep, the magnificent stone walls of the northern wall of the main keep, and the panoramic view of Sendai city continue to captivate visitors.
Continued archaeological excavations and research are gradually revealing the true nature of Sendai Castle, further increasing its historical value. Efforts are underway to pass on this precious cultural heritage to future generations while balancing preservation and utilization.
When visiting Sendai, be sure to visit the Sendai Castle ruins and experience the history of the magnificent castle built by Date Masamune and the beautiful views that can be seen from there. More than 400 years later, Sendai Castle continues to shine as a symbol of Sendai, the “City of Trees.”
