Engishiki: Japan's Oldest Surviving Legal Manuscript — A National Treasure Hidden in the Mountains of Osaka

Deep in the forested hills of Kawachinagano, south of Osaka, lies the ancient temple of Amanosan Kongoji — a place known as "Women's Mount Kōya" for its centuries-long tradition of welcoming female pilgrims. Within its treasure halls rests one of Japan's most historically significant documents: three scrolls of the Engishiki, hand-copied in 1127 CE and designated a National Treasure. These fragile brushwork manuscripts are the oldest known copies of a monumental 50-volume legal compendium that once governed every aspect of life in Heian-period Japan — from Shinto rituals and imperial ceremonies to astrology, textile production, and the mysterious art of Onmyōdō divination.

What Is the Engishiki?

The Engishiki (延喜式, "Procedures of the Engi Era") is a 50-volume compendium of administrative laws, court rituals, and Shinto practices compiled during the Heian period. In 905 CE, Emperor Daigo commanded the scholar-official Fujiwara no Tokihira to begin its compilation. After Tokihira's death in 909, his brother Fujiwara no Tadahira continued the ambitious project, which was finally completed in 927 CE. It took another 40 years of revision before the code was officially enforced in 967 CE.

Comprising approximately 3,300 articles, the Engishiki served as a comprehensive operations manual for the imperial government. Volumes 1 through 10 covered Shinto shrine administration and religious rituals. Volumes 11 through 40 detailed the workings of the Grand Council of State and the eight government ministries. The remaining volumes addressed military logistics, police operations, and miscellaneous procedures. It is the only one of the "Three Great Codes" (Sandai Kyakushiki) — alongside the earlier Kōnin and Jōgan codes — that survives in nearly complete form, making it an irreplaceable window into ancient Japanese governance and society.

The Kongoji Manuscripts: Oldest Surviving Copies

The original manuscripts of the Engishiki have been lost to the centuries. What survives today are handwritten copies made by later scribes. Among these, the scrolls preserved at Amanosan Kongoji Temple hold a place of singular importance. Copied in the second year of the Daiji era (1127 CE) during the late Heian period, these three scrolls — Volume 12 (a fragmentary portion), Volume 14, and Volume 16 — represent the oldest known manuscript copies of the Engishiki in existence. Together with a fourth scroll (Volume 9, designated separately as a National Treasure under the title "Engishiki Jinmyōchō"), they form an exceptionally rare survival from nearly 900 years ago.

The colophon of Volume 14 includes a postscript dated the 12th day of the 7th month of Daiji 2 (1127), providing precise evidence of when these copies were made. This level of documentation adds immense scholarly value to the manuscripts, anchoring them firmly within the timeline of Japanese textual history.

Why Were These Scrolls Designated a National Treasure?

These manuscripts were designated a National Treasure on November 22, 1952, for several compelling reasons. First, they are the oldest surviving copies of their respective volumes, predating other known manuscripts by considerable margins. Second, the textual content they preserve is extraordinarily valuable for understanding how the ancient Japanese state functioned at the most granular level. Because the Engishiki provides detailed operational regulations rather than abstract legal principles, these manuscripts offer concrete, practical insights into daily governance — from what materials were needed for court ceremonies to how astronomical observations were officially conducted.

Moreover, the physical manuscripts themselves are significant artifacts of Heian-period calligraphy and book production. The quality of the brushwork, the preparation of the paper, and the format of the scrolls all reflect the refined literary culture of late Heian Japan. These documents are not merely texts to be read; they are tangible evidence of how knowledge was transmitted and preserved in pre-modern Japan.

What Do These Three Volumes Contain?

Each of the three volumes preserved at Kongoji covers a distinct branch of the Heian-period imperial bureaucracy, offering fascinating glimpses into different aspects of court life.

Volume 12 — The Ministry of Central Affairs (Nakatsukasa-shō): This volume details the regulations governing the ministry that served as the administrative nerve center closest to the Emperor. It oversaw the drafting of imperial edicts, the management of the imperial seal, and the coordination between the sovereign and the broader government apparatus. Although only a fragment survives at Kongoji, even this partial text provides valuable evidence of how imperial authority was exercised through bureaucratic procedure.

Volume 14 — The Bureau of the Imperial Wardrobe (Nuidono-ryō): This volume prescribed the operations of the bureau responsible for producing and managing imperial garments, ceremonial textiles, and fabrics used in court rituals. It reveals the meticulous standards applied to everything from the selection of raw materials to the dyeing techniques and sewing methods used for clothing worn by the Emperor and court officials. For historians of textile arts and material culture, this volume is an invaluable primary source.

Volume 16 — The Bureau of Divination (Onmyō-ryō): Perhaps the most intriguing of the three for modern visitors, this volume covers the regulations of the Onmyōdō bureau — the government office responsible for divination, astrology, calendar production, and the observation of natural phenomena. The Onmyō-ryō employed specialists in reading celestial signs, determining auspicious dates for imperial activities, and interpreting omens. This volume provides a rare official record of how the Japanese court integrated cosmological and divinatory practices into state governance, a tradition that captivates imaginations to this day through popular culture depictions of the legendary Onmyōji Abe no Seimei.

Amanosan Kongoji Temple: Guardian of a Thousand Years

The manuscripts' survival is inseparable from the history of Amanosan Kongoji Temple itself. Founded in the Tenpyō era (729–749 CE) by the monk Gyōki under the orders of Emperor Shōmu, the temple was later associated with the great monk Kūkai (Kōbō Daishi), who is said to have practiced esoteric Buddhist training on the mountain. After falling into decline, the temple was revived in the late Heian period by the monk Akan, with the support of Retired Emperor Go-Shirakawa and his sister, Princess Hachijō-in.

Princess Hachijō-in enshrined a portrait of Kōbō Daishi that had been brought from Mount Kōya, establishing Kongoji as a sacred site where women could venerate the great master — something not permitted at Kōya-san itself at the time. This is the origin of the temple's beloved epithet, "Nyonin Kōya" (Women's Mount Kōya). During the turbulent 14th century, Emperor Go-Murakami of the Southern Court established his temporary palace here, making Kongoji a center of imperial governance during the wars between the Northern and Southern Courts.

Today, the temple preserves an extraordinary collection of National Treasures and Important Cultural Properties, including magnificent Buddhist sculptures, paintings, and these precious Engishiki manuscripts — all carefully maintained across more than a millennium of unbroken stewardship.

Highlights and What to See

While the Engishiki manuscripts themselves are typically displayed only during special exhibitions at the temple or at national museums, visiting Amanosan Kongoji offers a deeply rewarding cultural experience. The temple's expansive grounds feature a remarkable collection of historic architecture, nearly all designated as Important Cultural Properties. The Kondō (Main Hall), the Tahōtō (Pagoda), and the Rōmon (Tower Gate) create an atmosphere of timeless serenity.

The Honbō (Abbot's Quarters) area contains an exquisite Muromachi-period garden that transforms with the seasons — blanketed in cherry blossoms in spring and ablaze with crimson maples in autumn. The Treasure Hall occasionally displays items from the temple's remarkable collection, offering visitors a chance to encounter Buddhist art and historical artifacts spanning centuries. The Kanzō-in garden at the rear of the Honbō area, which once served as the Northern Court's temporary palace, provides a particularly contemplative space for reflection.

For those interested in the Engishiki specifically, the manuscripts have been exhibited at major institutions including the Kyoto National Museum (2015 and 2022 exhibitions on Kongoji's treasures), the Tokyo National Museum (2018 Ninna-ji exhibition), and other national venues. Checking exhibition schedules at these museums may provide opportunities to see the manuscripts in person.

Surrounding Area and Nearby Attractions

Kawachinagano is a city rich in cultural heritage, nestled at the foot of the Kongō mountain range that forms the border between Osaka and Nara Prefectures. The area around Amanosan Kongoji offers several complementary attractions. Kanshinji Temple, another National Treasure-bearing Shingon temple approximately 5 kilometers away, houses the celebrated seated statue of Nyoirin Kannon — one of the finest examples of Heian Buddhist sculpture in Japan. Together, Kongoji and Kanshinji make for a compelling day exploring two of southern Osaka's most important Buddhist heritage sites.

The Amanoyama Forest Park surrounding the temple provides pleasant hiking trails through the lush woodland. For families, the Kansai Cycle Sports Center is located nearby. The area is also known for its hot springs and traditional Japanese inns, making it a wonderful base for experiencing the quieter, more authentic side of the Osaka region, far from the bustling city center.