Nakano Castle was a Japanese castle that once stood in what is now Wakaba Ward, Chiba City, Chiba Prefecture. Today, Honjoji Temple, a temple of the Kempon Hokke School of Buddhism, stands on the former castle site.
Nakano Castle is traditionally said to have been built by Sakai Sadataka during the Sengoku period, although many details of its history remain uncertain. This combination of historical records, local traditions, and unanswered questions makes the site an intriguing part of Chiba’s history.
Nakano Castle is believed to have stood in the former province of Shimousa and is traditionally attributed to Sakai Sadataka. However, the origins of Sadataka’s family remain unclear. Various theories connect the family to the Fujiwara clan, Chiba clan, or Toki clan.
These differing theories have made Nakano Castle a subject of historical interest and research.
At the time, the Kazusa Sakai clan served as guest retainers of the Hara clan and was actively involved in military affairs. In 1487, the first year of the Chōkyō era, the clan attacked the Hatakeyama clan, which was based at Toke Castle. The following year, the Sakai moved to Toke Castle, and Sakai Sadataka gradually established himself as a Sengoku-period warlord.
Sadataka is also said to have invited Nittai Shonin from Hongyoji Temple and established Honjuji Temple within his territory, using Nichiren Buddhist teachings as part of his regional administration.
In 1488, the second year of the Chōkyō era, Nakano Castle was abandoned. At Sadataka’s request, Nittai Shonin subsequently established a Buddhist training center on the former castle site, and Honjoji Temple was founded there.
The temple was established in accordance with Sadataka’s religious beliefs and contributed to the spread of Buddhist teachings in the surrounding region. With the founding of Honjoji, the former castle site began a new chapter as a religious center.
Nakano Castle was located beside the Tōgane Highway, the historic route connecting Chiba and Tōgane and corresponding approximately to today’s National Route 126. It stood near the former boundary between Shimousa Province and Kazusa Province.
The castle was built on a plateau approximately 54 meters above sea level, within the river system of the Kashima River. The site made use of a peninsula-like section of high ground extending toward the north.
Shallow valleys had eroded the land to the north and northwest, while the plateau continued toward the east. As a result, the site’s defensive potential had certain limitations. Nevertheless, the surviving landscape provides clues about how people in the Sengoku period made use of the natural terrain when developing fortified settlements.
From Chiba Station, take a Chiba Flower Bus service bound for Nakano Bus Terminal or Naruto. Get off at the Hachiman-mae bus stop, excluding limited-stop services, and walk for approximately 10 minutes.
Although few visible structures from the original castle remain, visitors can explore the surrounding area while imagining the landscape of the Sengoku period and enjoying the area’s natural scenery.
Honjoji Temple was founded in 1489, the first year of the Entoku era, at the request of Sakai Sadataka.
Sadataka is regarded as the founder of the Kazusa Sakai clan and was also known as the lord of Toke Castle during the Sengoku period. Because Honjoji was built on the former site of Nakano Castle, sections of the castle’s earthen ramparts and moats still remain within the temple grounds.
These remnants add historical significance to Honjoji and allow visitors to appreciate the area’s connection to its former castle.
One of Honjoji’s important treasures is a cast-bronze waniguchi gong bearing an inscription dated 1361, the sixth year of the Kōbun era.
The gong is regarded as the oldest surviving example of its kind in Chiba Prefecture and has been designated as a Tangible Cultural Property of Chiba Prefecture. Its age and historical value make it an important piece of the region’s Buddhist and cultural heritage.
Honjoji can also be reached from Chiba Station by taking a Chiba Flower Bus bound for Nakano Bus Terminal or Naruto. Get off at the Hachiman-mae bus stop and walk for approximately five minutes.
Visiting Honjoji together with the Nakano Castle ruins provides an opportunity to experience the area’s historical atmosphere and discover how a former castle site was transformed into a Buddhist temple.
Nakano Castle Ruins and Honjoji Temple are interesting historical sites in Wakaba Ward, Chiba City, where visitors can explore the area’s connection with the Sengoku period.
At Honjoji, visitors can learn about the traditions of Hokke Buddhism and the history of the temple while discovering a valuable cultural property associated with the region. The surviving earthworks and moat traces also provide clues to the former castle.
For those interested in Japanese history, walking around the site offers a chance to imagine the landscape of the Sengoku period and learn how religious and political history became intertwined in this part of Chiba.
Nakano Castle Ruins and Honjoji Temple are valuable historical sites that preserve aspects of Chiba’s medieval past. The castle, traditionally attributed to Sakai Sadataka, and the temple established through his religious devotion both played important roles in the development of the local community.
Today, traces of the former castle can still be found alongside the temple, creating a fascinating setting where the past and present meet. A visit to Nakano Castle and Honjoji offers travelers an opportunity to discover a lesser-known part of Chiba’s history while enjoying the peaceful surroundings of Wakaba Ward.