Osake Shrine stands at the foot of Mount Hōju in Sakoshi, Ako City, Hyogo Prefecture. Formerly ranked as a prefectural shrine, it is best known for the Sakoshi Boat Festival, one of the three great boat festivals of the Seto Inland Sea. This spectacular traditional celebration has been designated an Important Intangible Folk Cultural Property of Japan.
The surrounding Sakoshi district is also known for its historic streets and traditional harbor-town atmosphere. Visitors can explore preserved streetscapes and local heritage sites, including the Sakoshi Machinami Museum, while experiencing the area’s deep connection with maritime culture and centuries-old religious traditions.
The shrine’s principal deity is Osake Ōkami, identified with Hata no Kawakatsu, a historical figure traditionally associated with the shrine’s origins. Two other principal deities are also worshipped here: Amaterasu Ōmikami, the sun goddess and one of the most important deities in Japanese mythology, and Kasuga Ōkami, a collective name associated with the four deities traditionally enshrined at Kasuga shrines.
The history of Osake Shrine is traditionally traced back to the Asuka period, when Hata no Kawakatsu was active. He belonged to the Hata clan, a prominent group in early Japanese history, and is remembered as an associate of Prince Shōtoku, an influential statesman who helped promote Buddhism in Japan.
According to tradition, Hata no Kawakatsu founded Kōryū-ji Temple in Kyoto, one of Japan’s oldest Buddhist temples. The temple became home to a celebrated statue of Maitreya Bodhisattva in a contemplative pose, now designated a National Treasure, which is said to have been bestowed by Prince Shōtoku.
Near Kōryū-ji stands Osake Shrine in Kyoto, traditionally associated with the separation and relocation of shrines once connected with the temple precincts. The name Osake is also linked to the alternative reading of Osake Shrine in Sakoshi.
According to local tradition, Hata no Kawakatsu moved to Sakoshi in 644, during the reign of Empress Kōgyoku. He is said to have helped develop the area around the Chikusa River. After his death in 647, local people enshrined his spirit, giving rise to the shrine.
On Ikushima Island, which lies offshore from the shrine, is a burial mound traditionally identified as Hata no Kawakatsu’s tomb. The island is designated a Natural Monument of Japan and is treated as sacred ground, with public access restricted to protect its religious significance.
A record known as the *Harima Province Sōja Shrine Origins* mentions the shrine in 1182, indicating that it was already an established religious center by the late Heian period.
One of the shrine’s notable treasures is a mask representing Ranjō, a traditional dance associated with gagaku, Japan’s classical court music and dance. According to tradition, Hata no Kawakatsu carved the mask himself. It is regarded as an object with a history stretching back more than 1,300 years.
Hata no Kawakatsu is also traditionally associated with the origins of sarugaku, an early form of performance art that contributed to the development of Noh theater. Various performing-arts traditions and families have claimed connections to him, including the Konparu school of Noh.
The 1426 genealogical work *Honchō Kōin Jōunroku* offers another account, identifying the deity of Osake Shrine with Toyohiko-no-Ō, described as a son of Emperor Ankan and an ancestor of the Hata clan. Such accounts illustrate the variety of traditions that developed around the shrine’s origins.
Some modern speculative theories have attempted to connect the Hata clan with ancient Jewish history through interpretations of the shrine’s name and Chinese characters. These claims are not established historical conclusions and should be understood as theories rather than verified facts.
The main sanctuary, rebuilt in 1769, is the central building of the shrine. Its long history and traditional architecture reflect the site’s enduring religious importance.
The worship hall and the shrine gate were both rebuilt in 1746. The gate preserves an unusual feature reflecting the historical blending of Shinto and Buddhism in Japan: guardian figures associated with Shinto shrines and Buddhist temple guardians are positioned back-to-back.
The ema hall displays more than 40 votive plaques dating from the Edo period and later. Among them is a ship-themed votive painting dated 1722, considered particularly valuable for its depiction of traditional maritime culture.
Yasurai Well is another feature of the shrine grounds. It has long been regarded as an object of local religious belief, adding to the atmosphere of tradition surrounding the sanctuary.
Several smaller shrines stand within the grounds of Osake Shrine, reflecting the diverse religious traditions of the Sakoshi community.
Shingū Shrine enshrines Prince Shōtoku, Sumiyoshi Ōkami, Konpira Ōkami, and the deity of Kaijinja Shrine. Tenman Shrine, dedicated to Sugawara no Michizane, was originally located on Mount Tenjin in the northern part of the district. Ebisu Shrine, which enshrines Ebisu, was formerly situated along the Honmachi waterfront, while Kōjin Shrine, dedicated to a deity associated with the hearth, originally stood in the eastern district.
Awashima Shrine was established through the transfer of a deity from Kada in Wakayama Prefecture. Inari Shrine is associated with prayers for prosperous business and abundant harvests.
Myōken-ji Kannon Hall is a related religious site located on the mountainside behind Osake Shrine, reached by climbing the shrine’s rear approach. It enshrines Nyoirin Kannon, the Six Forms of Kannon, and Kōbō Daishi, the revered Buddhist monk associated with Shingon Buddhism.
The hall originally served as the shrine’s attached Buddhist temple during the period when Shinto and Buddhism were practiced together. It became independent following the government’s separation of the two religions in the early Meiji period. The building was also used as an elementary school for Sakoshi Village in the past, giving it an additional place in local history.
The Sakoshi Boat Festival takes place in October, traditionally on the second Sunday of the month. According to local tradition, the festival recreates the arrival of Hata no Kawakatsu in Sakoshi and has been celebrated since the early Edo period. It is renowned for its magnificent procession of traditional wooden boats, ceremonial music, and energetic performances.
The festival is often associated with the poetic image of autumn colors spreading across both mountains and sea. Its combination of solemn religious rites and elaborate maritime pageantry makes it one of the region’s most distinctive traditional celebrations.
The festivities begin with the eve-of-festival ceremonies. A memorial service is held in front of the burial mound on Ikushima Island, traditionally regarded as the tomb of Hata no Kawakatsu. A special song boat then travels along the coastline, performing traditional boat songs in a ritual known as *isoarai*. Meanwhile, groups of young people and children perform lion dances as they parade through the town.
On the main festival day, lion dances continue through the morning before the maritime procession begins. Six ceremonial boats representing the six local parish districts are prepared, carrying shrine parishioners and other participants. The procession includes flag boats, a sacred boat, a song boat, and boats with unpainted wooden finishes.
The vessels head toward Ikushima Island offshore as singers aboard the song boat perform traditional *ofunauta* boat songs, accompanied by calls such as “Yare Kōrya” and “Sakashijasa.” The music and coordinated movement of the boats create a distinctive spectacle on the water.
At Ikushima, Shinto priests conduct ceremonies to welcome the sacred spirit and transfer it to the principal sacred boat. The procession then travels across the waters of Sakoshi. Ceremonies at the temporary shrine on the dragon-shaped ceremonial platform are among the important ritual moments of the event.
After dark, the sight of the boats illuminated by lanterns along the shore creates an especially atmospheric scene. The glowing fleet, traditional songs, and reflections on the water draw many spectators and provide a memorable conclusion to the celebrations.
The Sakoshi Boat Festival is designated an Important Intangible Folk Cultural Property of Japan in recognition of its historical significance and cultural value. Passed down through generations, it remains a powerful expression of the community’s shared faith, maritime heritage, and local identity.
By train, take the JR Ako Line to Sakoshi Station and walk for approximately 15 minutes to reach the shrine. By car, the journey from the Ako Interchange on the Sanyo Expressway takes around 10 minutes. Parking is available at the shrine, but congestion is expected during the festival, so public transportation is recommended on event days.
Osake Shrine is an important symbol of Sakoshi’s history and cultural identity. Its traditions connect the legendary story of Hata no Kawakatsu with the community’s enduring relationship with the sea. Visitors can explore the shrine’s historic buildings, learn about its distinctive religious heritage, and experience the spectacular Sakoshi Boat Festival, where traditional wooden vessels, music, dance, and sacred ceremonies bring centuries of local culture to life.