Izushi Castle is a historic castle site located in Izushi Town, Toyooka City, Hyogo Prefecture. Once an important stronghold in the former Tajima Province, it played a significant role in regional politics and military affairs from the Warring States period through the Edo period. Today, the ruins are designated a Historic Site by Toyooka City, preserving the memory of the area’s feudal past.
Although the original castle buildings were largely dismantled during the Meiji period, visitors can still see impressive stone walls, a moat, and restored turrets and gates. Set against the surrounding hills and the traditional streets of Izushi, the castle grounds offer an inviting introduction to the history and culture of this former castle town.
The story of Izushi Castle begins with the Yamana clan, which once held considerable power in the region. Yamana Tokiyoshi, who served as military governor of Tajima Province, built Konosumiyama Castle on Mount Konosumi, north of Izushi Shrine. The castle became the Yamana clan’s principal stronghold for many years.
In 1569, during the campaign led by Hashiba Hideyoshi, the castle fell to invading forces. Yamana Suketoyo temporarily lost control of his territory but later reached a settlement with Oda Nobunaga through the mediation of the wealthy merchant and tea master Imai Sokyu, allowing him to return to his domain.
In 1574, Yamana Suketoyo built a new fortress, Arikoyama Castle, on the summit of Mount Arikoyama, which rises approximately 321 meters above sea level. The mountaintop fortress was accompanied by a residence and administrative center at the foot of the mountain, where a castle town gradually developed.
Arikoyama Castle fell in 1580 during Hideyoshi’s second campaign to subdue Tajima. The defeat brought an end to the Yamana clan’s position as an independent warlord family and marked a major turning point in the region’s history.
After the fall of Arikoyama Castle, the area continued to be governed by successive castle lords. Maeno Nagayasu became lord in 1585, followed by Koide Yoshimasa in 1595.
During the Battle of Sekigahara in 1600, the Koide family took the unusual precaution of supporting opposing sides. Yoshimasa joined the Western Army, while his younger brother Hideie fought for the Eastern Army. Following the Eastern Army’s victory, Hideie’s service helped the family retain its territory, and the domain remained under Koide rule.
In 1604, Koide Yoshihide reorganized the castle complex, abandoning the mountaintop keep of Arikoyama Castle and establishing a new castle at the foot of the mountain. This became Izushi Castle.
The new fortifications were arranged in a series of stepped enclosures, including the Sannomaru, lower bailey, Ninomaru, Honmaru, and Inarimaru. The lord’s residence and other administrative facilities were also developed as part of the new complex.
The surrounding town was reorganized at the same time, helping shape the historic street pattern that can still be seen in Izushi today. The relationship between the castle, its administrative district, and the merchant and residential areas remains an important part of the town’s character.
During the Edo period, Izushi Castle served as the administrative center of the Izushi Domain. The Koide family initially governed the domain, but in 1696, Koide Hidechika died at the age of three without an heir, and the family domain was confiscated.
Matsudaira Tadachika of the Fujii-Matsudaira family subsequently entered the castle. In 1706, Sengoku Masaaki became the new lord, and the Sengoku family continued to govern from Izushi Castle until the abolition of the feudal domains and establishment of prefectures in the Meiji period.
In the late Edo period, the domain was shaken by the incident known as the Sengoku Disturbance, a political dispute involving the ruling family and domain administration. The episode forms another chapter in the complex history of Izushi’s feudal government.
Following the beginning of the Meiji period, the castle was dismantled under the government’s castle-abandonment policies. However, several historic features survived, including the stone walls, moat, and the Tatsumi Watchtower Clock Tower, known as Tatsugoro, which has become one of the symbols of the surrounding town.
Some of the castle’s turrets, the approach gate, and the entrance bridge have also been reconstructed. The area around the bridge has been developed as the Tojo Bridge Riverside Park, allowing visitors to explore the castle ruins and enjoy the scenery at a leisurely pace.
Izushi Castle was designated a Historic Site by Toyooka City on March 30, 1968. On April 6, 2017, it and nearby Arikoyama Castle were selected for inclusion in Japan’s Continued Top 100 Castles list, under number 162.
These designations recognize the historical importance of the two castles and their role in the development of the Izushi area. For visitors interested in Japanese castles, the combination of surviving fortifications and the historic townscape provides an opportunity to explore both the military and civic history of the region.
The castle is surrounded by other sites that reflect Izushi’s long history and religious traditions. Arikoyama Inari Shrine, Kan’oden, and Morosugi Shrine are among the nearby places of interest. The shrine paths and traditional streets provide opportunities to explore the area beyond the castle grounds.
Other highlights include the Izushi Traditional Buildings Preservation District, the Tatsugoro Clock Tower, the Izushi Senior Retainers’ Residence, and Sukhyoji Temple, which is associated with the Zen monk Takuan Soho. Together, these places preserve the atmosphere of a traditional Japanese castle town and make Izushi an appealing destination for a relaxed historical walk.
Izushi Castle is best appreciated as part of a broader visit to the historic town. The stone walls and reconstructed structures offer a glimpse of the castle’s former defensive layout, while the surrounding streets reveal how the town developed under successive feudal lords.
Take time to explore the nearby shrines, temples, traditional buildings, and the distinctive Tatsugoro Clock Tower. The blend of mountain scenery, historic remains, and preserved townscape makes Izushi a rewarding destination for travelers interested in Japanese history and traditional architecture.
From Toyooka Station on the JR San-in Main Line or Kyoto Tango Railway, or from Yoka Station on the JR San-in Main Line, take a Zentan Bus bound for Izushi. The journey takes approximately 30 minutes, and Izushi is the final stop. From the bus terminal, the castle ruins are about a five-minute walk away.
By car, the area can be reached from Fukuchiyama Interchange on the Maizuru-Wakasa Expressway via National Routes 9 and 426. Once in Izushi, the castle and surrounding historic district are convenient to explore on foot.