Kozaki Shrine is a historic Shinto shrine located in Kozaki Town, Katori District, Chiba Prefecture. The shrine was traditionally part of Shimousa Province and has been an important center of local worship for centuries.
The principal deities enshrined here are Ame-no-Torifune-no-Mikoto, Ōnamuchi-no-Mikoto, and Sukuna-bikona-no-Mikoto. The shrine was once known as Komatsu Shrine, but was later renamed Kozaki Shrine and has continued to be deeply respected by the local community.
The exact date of Kozaki Shrine’s foundation is unknown. According to shrine tradition, however, the shrine was transferred to its present location in 673, during the Hakuho era, from Futatsuzuka in Ōura-numa, an area near the former boundary between Hitachi and Shimousa Provinces.
This tradition indicates that the shrine has been associated with the region since ancient times. In 879, it was granted the court rank of Junior Fifth Rank, Lower Grade, demonstrating that it was already recognized as an important shrine during the Heian period.
The shrine was formerly called Komatsu Shrine. After the beginning of the Meiji period, it came to be known as Kozaki Shrine. The new name became firmly established within the local community, while the shrine continued to serve as an important place of worship.
Kozaki Shrine was not a subordinate shrine of Katori Jingu, but historical traditions indicate that the two shrines had connections through certain religious ceremonies.
For example, Kozaki Shrine is said to have been responsible for constructing the Asame-den during periodic rebuilding ceremonies. Its principal deity, Ame-no-Torifune-no-Mikoto, is also closely associated with both Katori Jingu and Kashima Jingu.
These connections provide an indication of the important religious role Kozaki Shrine played within the wider region.
One of the most impressive sights within the shrine grounds is the enormous Great Camphor Tree of Kozaki. Locally known as the “Nanja Monja Tree,” this ancient camphor tree is designated a Natural Monument of Japan.
The tree is believed to be more than 1,000 years old. It measures approximately 13.1 meters in circumference and stands about 19 meters tall, giving it a powerful presence within the shrine grounds.
The tree has traditionally been regarded as a yorishiro, a natural object believed to attract or serve as a dwelling place for a kami, or Shinto deity. Its enormous size and age contribute to the sacred atmosphere of the shrine.
The shrine is surrounded by a rich woodland known as Kozaki no Mori, or “Kozaki Forest.” This shrine forest is designated as a Natural Monument by Chiba Prefecture and plays an important role in protecting the area’s natural environment.
Ancient trees and other plants can be found throughout the woodland, creating a peaceful setting for visitors. Walking among the trees offers a quiet opportunity to experience the close relationship between nature and Shinto worship.
During the Warring States period, Kozaki Shrine is said to have possessed approximately 700 chō of shrine lands and received strong protection from successive regional rulers.
During the Edo period, the shrine held 20 koku of shuinryō, land whose revenue was officially guaranteed by the shogunate. These resources helped support the shrine’s religious activities and its role as an important cultural center of the local community.
A collection of historical manuscripts and maps dating from the early Kamakura period through the Muromachi period has been preserved at the shrine.
Known collectively as the Kozaki Shrine Documents, these materials provide valuable information about the history of the region during medieval Japan. They have been designated Intangible or Tangible Cultural Properties by Chiba Prefecture and are regarded as important historical sources.
Jinguji Temple, the former Buddhist temple associated with Kozaki Shrine as its bettōji, also preserved an important collection of historical materials.
Known as the Jinguji Temple Documents, the collection includes Buddhist scriptures copied during the Northern and Southern Courts period. Although 60 volumes are missing from the original collection of 600 volumes of the Mahāprajñāpāramitā Sūtra, the remaining manuscripts are valuable sources for understanding Buddhist temples and religious life during medieval Japan.
These documents are also designated as Cultural Properties of Chiba Prefecture.
Kozaki Shrine is notable not only for its long religious history but also for the combination of ancient trees, protected woodland, historic documents, and traditional shrine architecture.
The Great Camphor Tree of Kozaki is particularly symbolic. Standing within the shrine grounds for centuries, it represents the enduring relationship between the natural environment and local religious traditions.
For visitors interested in Japanese history, Shinto traditions, ancient trees, and medieval cultural heritage, the shrine offers a chance to experience these elements together in a relatively peaceful setting.
Kozaki Shrine is approximately a 20-minute walk from Shimousa-Kozaki Station on the JR Narita Line. The route from the station is relatively flat and suitable for walking.
The shrine can also be reached by car via National Route 356 and the Edosaki-Kozaki Line, a prefectural road jointly designated as Chiba Prefectural Road 107 and Ibaraki Prefectural Road 107.
It is located near the southern end of Kozaki Bridge, making it relatively easy to reach by car when exploring the surrounding area.
Kozaki Shrine is a historic place of worship where the natural landscape and the religious traditions of the region have remained closely connected.
The ancient Great Camphor Tree, the peaceful Kozaki Forest, the shrine’s links with major religious centers such as Katori Jingu and Kashima Jingu, and its collection of medieval historical documents all contribute to the shrine’s cultural significance.
For travelers exploring Chiba beyond its major tourist destinations, Kozaki Shrine offers a quiet opportunity to encounter ancient Japanese religious traditions, protected nature, and the history of medieval Japan in one place.