Fudō-in Iwaya-dō Temple: A Shugendō Cliffside Temple in Japan
Site at a Glance
- Rating
- 4.2
- Popularity
- Low
- Country
- Japan
- Primary era
- Medieval
- External website
- Open
- Eras represented
- Medieval
- Civilizations
- Ashikaga shogunate
- Site type
- Religious
- Remains
- Temple
On this page10 sections
History
Fudō-in Iwaya-dō Temple is a Shugendō Buddhist temple in Japan, associated with the Daigo branch of the Shingon school. Shugendō is a mountain-based religious tradition that combines Buddhist, Shinto, and ascetic practices. A local record attributes the temple’s foundation to 806, while the surviving hall is dated by a twentieth-century structural investigation to the early Muromachi period, within the Nanboku-chō period of 1336 to 1392.
Early history and destruction
Before the medieval period, Iwaya-dō was reportedly part of the large Shinkō-ji temple complex on Mount Myōken. That complex held a temple estate assessed at 150 koku. The wider complex is said to have been burned in 1581 during Toyotomi Hideyoshi’s invasion of Inaba Province. Hideyoshi was a sixteenth-century military ruler whose campaigns brought much of Japan under his control. Iwaya-dō alone survived the destruction.
The surviving hall and later repairs
Tradition attributes the reconstruction of the present hall to Minamoto no Yoritomo in the early Kamakura period. Yoritomo founded Japan’s Kamakura shogunate in the late twelfth century. The report produced after the hall was dismantled and repaired between 1955 and 1957 instead places its construction in the early Muromachi period. The building later underwent a major repair during the Edo period.
The 1955 to 1957 intervention examined the structure’s vulnerability to decay and identified evidence of repeated earlier repairs. Fudō-in Iwaya-dō was designated a National Important Cultural Property on November 14, 1953, and was also selected among Tottori Prefecture’s 100 Selected Buildings. A goma, a Buddhist fire ritual, remains associated with the temple.
Religious importance
Alongside Nageire-dō at Sanbutsu-ji on Mount Mitoku and the inner worship hall of Ryūgan-ji in Usa, Iwaya-dō is regarded as one of Japan’s three great Nageire-dō. A Nageire-dō is a religious hall built into or against a steep mountain rock formation. The temple’s principal image is also sometimes counted among Japan’s three great Fudō Myōō images, although the membership of that group is disputed. Fudō Myōō is a wrathful Buddhist deity associated with immovable resolve and the protection of Buddhist teachings.
Remains
Cave setting and construction
The rock cave and setting
The temple stands beside the Yoshikawa River, a tributary of the Hattō River, with its hall fitted into a natural rock cave. The cave rises approximately 13 meters, measures about 7 meters across at the front, and extends roughly 10 meters into the rock. This setting shelters the building from rain but leaves it exposed to persistently damp air because ventilation is poor.
The temple hall
The hall is a single-story structure approximately 10 meters high, arranged on a three-by-three-bay plan. A bay is the interval between structural posts. The building measures about 5.0 meters across and 5.0 meters deep, with an actual frontage of approximately 4.99 meters. Its front has a hip-and-gable roof, combining sloping roof planes with a gabled end, while the rear has a gabled roof and the entrance is placed at that end. Thin overlapping boards made by splitting Japanese cypress cover the roof.
Long posts support the floor above the ground in the cliffside technique called kakezukuri. This method uses projecting posts and beams to support a building over steep or irregular ground. A flower-shaped window and balustrades with ornamental finials extend along the front and east-side verandas.
Structural decay and repair
The cave’s damp conditions caused progressive decay in the supporting posts and roof. During the 1955 to 1957 dismantling and repair, severe rot was found at the bases of the posts carrying the stage. Earlier repairs had repeatedly shortened the decayed ends of these posts. Natural stones were then stacked on the foundation stones to compensate for the lost length, revealing how the building had been maintained before the modern intervention.
Principal image
The temple’s principal image is a Black-Skinned Fudō Myōō traditionally attributed to Kūkai, the ninth-century founder of the Shingon school in Japan. It is said to have been made when Kūkai was 33 years old.
