Masumida Shrine (真清田神社)

Masumida Shrine stands at the geographical and mythological heart of what was once Owari Province — a region that would become the birthplace of three of Japan’s most consequential warlords: Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu. The shrine’s name comes from ma-sumida, meaning “true clear rice field,” and it has served as the ichinomiya (first-ranked shrine) of Owari since the 9th century. The current main hall, rebuilt in 1672 after a catastrophic fire, sits in the center of modern Ichinomiya City — a city that literally took its name from the shrine’s rank. To visit Masumida is to stand where divine agriculture meets political ambition, where the rice paddies blessed by Amaterasu fed the armies that unified Japan.

Masumida Shrine’s founding is placed in the mythological era, traditionally dated to the reign of Emperor Kōshō (475-393 BCE according to the traditional chronology), though verifiable records begin in the Nara period (710-794 CE). The shrine was established to honor the reclamation and cultivation of the fertile Nōbi Plain, and by the Heian period it had achieved ichinomiya status — the highest-ranked shrine in Owari Province. This designation meant that provincial governors would visit Masumida first when conducting official religious duties. The shrine prospered under the patronage of the Owari Tokugawa family during the Edo period, receiving land grants and reconstruction support. The great fire of 1560 destroyed much of the complex, but rebuilding began under Oda Nobunaga’s authority, with the current main hall completed in 1672 in the elegant Owari-zukuri architectural style.

Amenohoakari no Mikoto (天火明命) is the primary deity, a god of agriculture and celestial fire who appears in both the Kojiki and Nihon Shoki. He is the elder brother of Ninigi no Mikoto (grandfather of Emperor Jimmu) and grandson of Amaterasu Ōmikami. According to mythology, Amenohoakari descended to earth before his younger brother and taught humans the cultivation of rice and the forging of tools. He carries a sacred hoe and is associated with the dawn light that illuminates rice fields. At Masumida, he is specifically venerated as the divine ancestor who cleared the wilderness of Owari and made it suitable for rice agriculture — the act that gave the shrine its name. The shrine also enshrines his consort and descendant deities connected to water management and harvest.

The shrine’s founding legend tells of Amenohoakari descending to the Nōbi Plain when it was still a wild wetland choked with reeds and prone to flooding. He thrust his sacred hoe into the earth at the site where the shrine now stands, and from that point, a spring of pure water emerged. The water was so clear (sumida) that it reflected the heavens perfectly, and the land around it became fertile beyond measure. Amenohoakari taught the first settlers how to build irrigation channels following the contours of the plain, creating the vast rice paddies that would feed Owari Province for millennia. The original well, called Masumida no I (True Clear Well), was said to remain perfectly clear even during floods, and warriors from the Sengoku period would drink from it before battle, believing it granted clarity of purpose. Though the original well site was lost in the 1560 fire, a reconstructed sacred well stands in the shrine grounds today.

The main hall (honden) exemplifies Owari-zukuri style, a regional variation of nagare-zukuri characterized by an extended, sweeping roof line and deep eaves that create dramatic shadows. Built in 1672 using keyaki (zelkova) wood, the hall features elaborate carvings of phoenixes and dragons beneath the gables, commissioned by the Owari Tokugawa clan. The rōmon gate, reconstructed in 1995, stands two stories tall with vermillion pillars and a copper roof that has aged to a soft green patina. The shrine grounds contain over 40 subsidiary shrines, including a notable Inari shrine with miniature torii gates and a shrine dedicated to Kōbō Daishi, reflecting syncretic practices of the Edo period. Ancient camphor trees, estimated at over 800 years old, shade the eastern approach, survivors of the 1560 fire. A sacred sakaki tree grove marks the original location of the mythological spring, maintained with extreme care by shrine priests.

• Tōka-sai (Peach Blossom Festival, April 3) — The shrine’s most important annual ritual, celebrating the spring agricultural season with offerings of the first peach blossoms and prayers for bountiful harvest. A sacred dance called otome-mai is performed by shrine maidens in elaborate Heian-period costumes.
• Reisai Grand Festival (July 20-23) — Four days of processions featuring portable shrines (mikoshi) carried through Ichinomiya City, with traditional music ensembles and nighttime lantern displays. Local children perform ritual rice-planting dances.
• Niiname-sai (November 23) — Harvest thanksgiving ritual where the first rice from local paddies is offered to Amenohoakari, continuing a tradition documented since the 9th century.
• Hatsumode (January 1-3) — New Year visits draw over 280,000 people, making Masumida one of the most visited shrines in Aichi Prefecture during this period.

Early April during the peach blossom season, when the Tōka-sai festival coincides with the flowering of ornamental peach trees throughout the shrine grounds, creating clouds of pink and white blossoms. The festival includes cultural demonstrations and the rare opportunity to witness otome-mai, a sacred dance seldom performed outside this event. Weekday mornings in autumn (late October through November) offer a quieter experience, with ginkgo and maple foliage framing the main hall in gold and crimson. The shrine is less crowded than Kyoto’s famous temples, yet the quality of momiji viewing rivals more celebrated locations.