The Origins and Medieval History of Hōshōji
According to historical records, the origins of Hōshōji can be traced back to the Kōchō era (1261–1263) of the Kamakura period.
In 1384, at the request of the Okudaira family of Okudaira in Tano District, a monk named Gen’yū from Ninna-ji Temple in Kyoto was invited to the area. The temple was then moved to the right bank of the Kabura River and was known as Daidōbō Jizō-in, Higan-zan Hōshōji.
The temple was later revived during the Eishō era (1504–1521) and relocated to its present site on the left bank of the Kabura River.
During the medieval period, Hōshōji is believed to have had 13 branch temples across Tano and Kanra districts. Its wide network demonstrates the important role it played in the religious and cultural life of the region.
From the Warring States Period to the Edo Era
A Temple Supported by Feudal Lords
During the Warring States period, the Obata clan and Okudaira Nobumasa, the son-in-law of Tokugawa Ieyasu, are said to have regarded Hōshōji as a temple where prayers could be offered for the protection and prosperity of their domains.
When the Obata Domain was established during the Edo period, Oda Nobuyoshi, a grandson of Oda Nobunaga, became its lord. Successive Oda lords continued to have a strong connection with Hōshōji.
The temple was granted six koku of shuinchi, a form of officially recognized land income granted by the shogunate. With the protection of the domain, Hōshōji continued to prosper.
When the ruling family later changed to the Okudaira-Matsudaira clan, the temple’s mountain name was changed to Kangizan in 1792.
A surveying record made by Inō Tadataka in 1814 describes the temple as “Kangizan Hōshōji of the Shingon school, receiving six koku of shuinchi,” providing a glimpse into its status at the time.
Hōshōji was also used as a family temple for successive domain retainers, and graves associated with prominent families remain on the grounds today.
Historic Cultural Treasures
The 1268 Stone Monument
One of the most important cultural treasures at Hōshōji is a 1268 stone monument known as an itabi, located in the temple cemetery.
The monument is made from green schist quarried in the Akinata area upstream along the Ogawa River. Its distinctive shogi-piece-like shape belongs to a style known as an Obata-style itabi, and it stands approximately 136 centimeters tall.
Particularly significant is the inscription of a religious verse on the monument. It is said to be the only surviving itabi in Gunma Prefecture bearing such a verse. The inclusion of the family name of the deceased is also considered exceptionally unusual.
This stone monument provides a valuable glimpse into the beliefs and memorial practices of people living in the Kamakura period.
Hōkyōintō Pagoda and Memorial Stones
The temple grounds also preserve a Hōkyōintō memorial pagoda dated 1401, as well as a memorial monument dedicated to Kito Gon-no-Kami, who is associated with the temple’s foundation.
These stone structures are important examples of medieval Buddhist culture and add to the historical depth of the temple grounds.
Historical Documents of Hōshōji
Another important cultural asset is the Hōshōji Kiritate Documents, compiled in 1820 by Jōkō, the temple’s 32nd head priest, in response to an inquiry from Matsudaira Tadashige, lord of the Obata Domain.
This historical record describes the origins and history of Hōshōji and its affiliated temples. It records details about the founding figures, principal Buddhist images, and histories of 15 temples, including Hōshōji, its 13 branch temples, and two associated temples.
Designated an Important Cultural Property by Kanra Town, the document provides valuable information about the organization of Buddhist temples and the relationship between religion and local administration during the Edo period.
Sanjū River and Ubako-do Hall
Traces of Traditional Folk Beliefs
A small tributary flowing in front of Hōshōji is known as the Sanjū River. One explanation for its name is that its water contains a relatively large amount of iron and can appear reddish in color, evoking traditional images of the river Sanzu-no-Kawa, the boundary between this world and the afterlife in Japanese Buddhist tradition.
Near the bridge stands Ubako-do Hall, where Datsueba, an elderly female figure associated with the afterlife, is enshrined.
The present hall was reconstructed during the Edo period and has been designated a Historic Site by Kanra Town. It provides a rare glimpse into traditional popular beliefs concerning death and the world beyond.
A Quiet Historic Temple to Visit in Kanra
Hōshōji is appealing not only for its historical importance but also for the peaceful atmosphere of its grounds. Seasonal flowers and greenery add color in spring, while autumn foliage creates a particularly tranquil setting.
Its location also makes it suitable for combining with a visit to other historic attractions in Kanra, including Rakusan-en and the traditional streets of the former Obata castle town.
From its Kamakura-period origins to its connections with samurai families and the lords of the Obata Domain, Hōshōji reflects the long history of faith in Kanra.
For travelers interested in Japanese history, Buddhist culture, and traditional landscapes, Hōshōji offers a quiet opportunity to encounter the layers of history preserved in this corner of Gunma.