Gilt Bronze Thin-Walled Seated Statue of Bosho Nyorai

The Gilt-Bronze Thin-Relief Seated Statue of Ratnasambhava: A Sacred Treasure from Mount Nachi

High in the misty peaks of southern Wakayama, where Japan's tallest sacred waterfall thunders into the green of Kumano's primeval forest, lies one of the most extraordinary Buddhist treasures to have survived from the Heian period. The Gilt-Bronze Thin-Relief Seated Statue of Ratnasambhava (Hōshō Nyorai), a small, exquisitely cast plaque belonging to Nachisan Seigantoji Temple, is far more than a religious icon. It is a piece of a once-buried, three-dimensional cosmic diagram, an offering committed to the earth by a devout monk in the year 1130 in hope of rebirth in a Pure Land. Rediscovered nearly eight centuries later in 1918, this small gilded image now stands as a quiet but profound witness to the deep spiritual currents that have shaped the Kumano sacred landscape.

A Treasure Born of Faith and Buried for Salvation

The story of this remarkable statue begins not with its creation, but with its deliberate burial. According to the temple chronicle known as the Kinkyōmon Engi, in the year 1130 (Daiji 5), a monk named Gyōyū entrusted a complete set of small gilt-bronze Buddhist images to the sacred ground of Mount Nachi. He did so as an act of profound religious devotion, praying that he might be reborn in the Pure Land of Nachi—a paradise believed to manifest at this most sacred of mountains. The objects he buried were not ordinary devotional images. Together, they composed a miniature three-dimensional Vajra Realm Mandala, an arrangement of metalwork sculptures expressing the cosmic order of esoteric Shingon Buddhism in physical, sculptural form.

For nearly eight hundred years the offering rested undisturbed beneath the soil. Then, in 1918 (Taishō 7), workers near the entrance to the Nachi Waterfall pilgrimage path, at a place called Koike, uncovered the treasures. Among the recovered objects were a central Vairocana Buddha and the Four Wisdom Buddhas of the Vajra Realm: Akshobhya, Ratnasambhava, Amitabha, and Amoghasiddhi, together with attendant bodhisattvas. The discovery was extraordinary, and the Ratnasambhava image presented here is one of the central figures from this group.

Why This Treasure Was Designated a National Cultural Property

On May 25, 1937, the Japanese government designated the entire group of excavated objects from the Nachi Sutra Mound—eight pieces in total, including this seated Ratnasambhava plaque—as a national Important Cultural Property under the category of archaeological materials. The reasons for this distinction are both historical and artistic.

First, the assemblage stands as the only known surviving example in Japan of a three-dimensional Vajra Realm Mandala expressed in metalwork on this scale. While painted mandalas were widely produced in the Heian period, the act of casting an entire mandala as physical, individual sculptures is exceptionally rare. This particular set, buried as a single ritual offering, gives modern viewers a unique window into how late Heian-period esoteric Buddhism was understood and practiced.

Second, the technical achievement is remarkable. The figures are cast in the thin-relief technique known as hakuniku, in which the body of the Buddha is rendered with a very thin metal surface, gilded to a lustrous gold finish. This method demands an extraordinarily skilled hand, and the gentle modeling, serene expression, and graceful drapery of the Ratnasambhava image clearly bear the refined aesthetic of the late Heian capital workshops. Finally, the find also illuminates the depth of Kumano faith during the medieval period, when emperors, aristocrats, and commoners alike made pilgrimage here in such numbers that the journey was nicknamed "the ant procession to Kumano."

Highlights and Points of Appreciation

Hōshō Nyorai, known in Sanskrit as Ratnasambhava or "the Jewel-Born One," is one of the Five Wisdom Buddhas of esoteric Buddhism. Within the Vajra Realm Mandala he occupies the southern direction and embodies the wisdom of equality—the spiritual insight that perceives all beings and phenomena as fundamentally equal in their Buddha-nature. He is traditionally depicted holding the wish-granting gesture, symbolizing his power to bestow spiritual treasures upon all who sincerely seek the path.

The image is small enough to hold in two hands, yet its execution is masterful. The Buddha sits in serene meditation upon a lotus pedestal, the body rendered with quiet dignity and a softness characteristic of late Heian art. The thin-cast gilded surface still catches the light with a warm glow that has survived centuries of burial. When viewed alongside its companion images of the other Vajra Realm Buddhas, the spiritual logic of the original mandala becomes visible—each Buddha holding a specific cosmic position, together forming a complete map of the enlightened universe.

Visitors interested in seeing items from the Nachi Sutra Mound excavation can inquire at the temple's treasure hall, the Takihōden, where related cultural properties from Seigantoji's collection are displayed. Some pieces from this excavation are also held by Tokyo National Museum and Kumano Nachi Taisha, having been distributed among institutions over the decades.

Visiting Nachisan Seigantoji Temple

Nachisan Seigantoji is the first temple on the celebrated Saigoku Thirty-Three Kannon Pilgrimage, a route walked by pious travelers for over a thousand years. The temple is reached by climbing a long stone staircase from the Daimon-zaka, a moss-shrouded path of ancient stones that itself forms part of the Kumano Kodō pilgrimage trails inscribed on the UNESCO World Heritage list in 2004 as part of "Sacred Sites and Pilgrimage Routes in the Kii Mountain Range."

The temple's main hall, rebuilt by Toyotomi Hideyoshi in 1590, is itself an Important Cultural Property and is the oldest standing wooden building in the Kii Peninsula's southern region. Standing 18 meters tall, the hall is said to match the height of the lip of nearby Nachi Waterfall. From a viewing point near the hall, visitors can take in one of the most photographed scenes in all of Japan: the vermilion three-tiered pagoda rising in the foreground with the 133-meter cascade of Nachi Falls plunging behind it.

The temple is open year-round, with the main hall accessible during daylight hours. Travelers wishing to view the treasure hall and additional exhibits should check the temple's current schedule, as displays of cultural properties may rotate.

Around Nachisan: A Sacred Landscape

Few places in Japan offer such a rich concentration of cultural and natural attractions within walking distance. Adjacent to Seigantoji stands Kumano Nachi Taisha, one of the three Kumano Grand Shrines, where the spirits of nature and ancestors have been venerated for well over a millennium. Just below the temple complex, the Nachi Waterfall—Japan's tallest single-drop waterfall—falls in a continuous white plume and is itself worshipped as the embodiment of a deity.

The Daimon-zaka stone path leading up to the temple takes about thirty minutes to walk and is lined with towering cedars said to be over 800 years old. For those interested in deeper exploration, the small temple of Fudarakusan-ji near the coast at Hama-no-miya tells the story of the medieval practice of Fudaraku tokai, in which monks set out across the sea in sealed boats seeking a Pure Land paradise. The Kumano Nachi area offers visitors a single landscape in which Buddhism, Shinto, and primal nature worship have lived together harmoniously for over a thousand years.