Ancient Origins and the Development of Worship
The origins of Iidama Shrine are believed to date back to ancient times. According to tradition, around 531, during the reign of Emperor Ankan, the provincial ruler of Ueno brought the spirit of Ukemochi-no-Kami from Sasayama in Tanba Province and enshrined it at this location.
During the reign of Emperor Kotoku, an imperial offering ceremony is said to have been conducted at the shrine. In 889, during the reign of Emperor Uda, the shrine is traditionally said to have received a sacred mirror, which was enshrined as a physical representation of the deity’s spirit.
In 1031, the district governor is said to have rebuilt the main shrine buildings. In 1062, the military commander Minamoto no Yoshiie reportedly stopped here while traveling to pacify the Tohoku region. He is said to have conducted a Shinto harvest thanksgiving ceremony and later made an offering upon his victorious return.
These traditions and historical records indicate that Iidama Shrine held an important position in both religious life and regional politics throughout the ancient and medieval periods.
Iidama Shrine and the Medieval Warrior Families
The “Kunitama Myojin, Junior Third Rank” recorded in the Shinmei-cho of Kozuke Province, an ancient register of Shinto shrines, is believed to refer to Iidama Shrine.
During the Ka-o era in the late 12th century, Nawa Taro Hirozumi, a descendant of the renowned warrior Fujiwara no Hidesato, is said to have revered the shrine as the tutelary deity of his clan. He supported the shrine by repairing its buildings and donating sacred rice fields.
Later generations of the Nawa family continued to worship the shrine. They prayed for victory before military campaigns and repeatedly supported repairs and reconstruction of the shrine buildings.
Although the Nawa family eventually disappeared during the turbulent Sengoku period, the shrine continued to receive protection in the Edo period from the Sakai family, who served as lords of Maebashi Castle and later as lords of the Isesaki Domain.
Under their patronage, the shrine buildings were repaired, torii gates were donated, and a mikoshi, or portable shrine, was presented. With this support, Iidama Shrine once again flourished as an important center of local worship.
The Shrine from the Meiji Period to the Present
In 1873, Iidama Shrine was officially designated a village shrine. In 1909, it was designated a shrine eligible to receive government offerings for its ceremonies.
Even after the modernization of Japan, Iidama Shrine continued to serve as a guardian shrine for the local community. It remains a place where residents gather to maintain traditional religious customs and express their prayers and gratitude.
Traditional Rituals and Annual Festivals
The Mugimaki Goshinji Ritual
One of the most distinctive traditions of Iidama Shrine is the Mugimaki Goshinji, or “Wheat-Sowing Sacred Ritual.” It is traditionally held from the end of the tenth month to the first Hatsu-Uma day of the eleventh month according to the old lunar calendar.
During this period, Shinto priests surround the main sanctuary and shrine grounds with shimenawa, sacred ropes that mark off an area as sacred. Entry by ordinary visitors is prohibited.
This unusual custom is connected to an ancient belief that the deities who had traveled to Izumo Province return together with the gods of Ueno and Musashi Provinces. A gathering of the deities is then believed to take place at Iidama Shrine.
Seasonal Purification and Autumn Festival
A Oharai purification ceremony is held every year on June 30 and December 31. In June, a large chinowa, or sacred ring made of reeds and other plants, is placed at the shrine entrance. Worshippers traditionally pass through the ring as a ritual of purification.
The annual autumn festival is held on the Sunday closest to October 17. In earlier times, it was known for a spectacular procession in which a mikoshi was carried through the community together with decorated horses.
Highlights of the Shrine Grounds
The grounds of Iidama Shrine contain a number of religious and historic features, including the torii gate, approach to the shrine, purification fountain, and main sanctuary.
Visitors can also find smaller sacred sites and monuments dedicated to various deities and historical figures, including Yasaka Okami, Masuho-no-Kuni Sasa Inari Shrine, and a monument dedicated to Prince Shotoku.
The quiet atmosphere of the grounds makes it easy to appreciate the shrine’s long history. Walking along the approach and among the old religious monuments offers a sense of how deeply Shinto traditions have been rooted in the local community.
Visiting Iidama Shrine
Iidama Shrine is approximately a 10-minute drive from Shin-Isesaki Station on the Tobu Railway.
The surrounding area also contains historic sites, including the Nawa Castle ruins, as well as schools and other local facilities. Visitors interested in Isesaki’s history can combine a visit to the shrine with a walk through the surrounding neighborhood.
A Shrine Where Ancient Faith Lives On
Iidama Shrine offers a fascinating glimpse into the religious history of the Isesaki and Sawa regions. From traditions dating back more than a thousand years to the distinctive Mugimaki Goshinji ritual and seasonal purification ceremonies, many aspects of the shrine’s heritage continue to be preserved.
For travelers exploring Isesaki, a visit to Iidama Shrine provides an opportunity to experience a quieter side of Japanese cultural heritage and reflect on the ancient beliefs, local traditions, and community history that have shaped this part of Gunma.