Iron Pagoda (also with Crystal Stupa)

A Reliquary Cast in Iron

In a hillside temple in Hofu, Yamaguchi Prefecture, a dark cast-iron pagoda carries the record of one of the most ambitious building campaigns of medieval Japan. An inscription set around its base is dated to the twenty-second day of the eleventh month of Kenkyu 8 (1197). The text names the priest who had it made: Chogen, the monk charged with rebuilding the great temple of Todai-ji in Nara after fire destroyed it in 1180.

The object is an iron treasure pagoda, or tetsu hoto. It stands about 160 centimeters tall, with a roof that spans roughly 96 centimeters, and its swelling central body recalls the water tier of a gorinto, the five-element stupa familiar from Japanese temple grounds. That body opens into a cylindrical niche, and inside sits a far smaller pagoda only 13.9 centimeters high, carved from clear rock crystal. The crystal pagoda holds a shari, a relic of the Buddha, set within the section that represents the element water.

Iron, crystal, and relic together form a single work that the government registered as a National Treasure. It is often described as the oldest surviving iron treasure pagoda in Japan.

Why a Monk from Nara Came to Suo

In 1180, during the war between the Taira and Minamoto clans, Taira forces set fire to Nara. Todai-ji, home of the Great Buddha, was reduced largely to ash. Restoring it became a national undertaking, and the court appointed the aging monk Shunjobo Chogen (1121-1206) as daikanjin, the chief almoner responsible for gathering the money, materials, and labor.

Rebuilding the largest wooden hall in the country demanded an enormous supply of timber. In 1186 the province of Suo, in what is now eastern Yamaguchi, was assigned as a funding province whose tax revenue and forests would support the project. Chogen traveled west to the provincial seat near Hofu and began felling great trees in the mountains inland.

Amidaji was founded here in 1187 as one of seven bessho, the satellite temples Chogen established across the country as bases for fundraising and worship. The temple also carried a political role: it was dedicated to praying for the well-being of the retired emperor Go-Shirakawa, the project's powerful patron. Made a decade into the rebuilding, the crystal-and-iron pagoda ties this small western temple directly to the rescue of Nara's greatest monument.

An Achievement in Iron, and a Written Record

Medieval Japanese metalworkers cast most ritual objects in bronze, which melts and flows readily. Iron is harder to handle. It melts at a higher temperature and cools quickly, so a large hollow casting can crack or fail to fill. Producing a pagoda of this size in cast iron was a genuine technical feat, and the quality of the work is one reason for the object's status. The casters are said to have trained under Chen Heqing (known in Japanese as Chinkei), a Chinese craftsman then active in Japan who also took part in restoring the Great Buddha at Todai-ji.

The square base matters as much as the pagoda above it. Each of its four faces carries a single large Sanskrit seed-syllable, the bija of one of the four Buddhas of the Diamond Realm, marking the cardinal directions. Around these, lines of cast text set out the purpose and date of Amidaji's founding, the temple's location, the seven buildings that made up the complex, and even practical details such as the cauldron used to heat water for the temple bathhouse. The inscription records a prayer for the retired emperor along with the names of Chogen and local officials, signed with the Buddhist invocation Chogen took as his own name, Namu Amida Butsu.

This combination of craftsmanship and documentary detail is why the pagoda was first protected under the old cultural-property law in 1902 and then designated a National Treasure under the current law on 20 March 1954.

What to Look For

Seen up close, the pagoda shows its age honestly. Several original fittings are gone: the door that once closed the relic niche, the decorative chains that hung from the corners of the roof, and the small wind-bells. The tall finial on top, representing the upper elements of wind and void, carries a repair inscription from the Kanbun era (1661-1673), so it is not the original. The base text, however, refers to a thirteen-ringed iron pagoda, which suggests the present silhouette follows the medieval design.

The crystal pagoda inside rewards a close look of its own. It is made in two parts, an upper and a lower half, and the relic rests in the water section. Two features draw the eye of specialists. The fire element is worked as a sharp triangular cone rather than the usual gentle curve, a trait seen on other objects linked to Chogen, and the void element at the top is shaped almost into a full sphere. Small as it is, the crystal tower is the spiritual core of the whole work, the reason the heavy iron shell exists at all.

The Temple and the Hill Around It

The pagoda is kept in the temple's treasure hall, which opens to visitors by reservation. The same hall holds other works connected to Chogen, including a seated portrait sculpture of the monk, an iron seal, and early temple documents, all designated Important Cultural Properties. At the thatched front gate stand two guardian Nio figures more than 2.7 meters tall, attributed to the school of the sculptor Kaikei and likewise nationally designated.

Lower on the grounds is a stone steam bath, or ishiburo, of a type Chogen is said to have provided so that the laborers cutting Todai-ji's timber could ease their fatigue and illness. A later bath is still fired on the first Sunday of each month, and visitors may use it for the cost of the firewood. In 2020, marking 900 years since Chogen's birth, the temple raised a memorial stupa modeled on the very crystal pagoda enshrined within the iron tower.

Today Amidaji is best known across western Japan as a hydrangea temple. Around 80 varieties and some 4,000 plants cover the slopes, and the temple holds a hydrangea festival through June, when a modest admission fee applies. The grounds look out over the city of Hofu toward the sea. To reach the temple, take a bus bound for Amidaji from JR Hofu Station, a ride of about 20 minutes to the final stop, or drive roughly 15 minutes from the Hofu-higashi interchange on the Sanyo Expressway.