Meigetsuki: The 800-Year-Old Diary That Connects Poetry, Politics, and the Cosmos

Hidden within a centuries-old storehouse in Kyoto lies one of Japan's most extraordinary National Treasures: the Meigetsuki (明月記), or "Record of the Clear Moon." This remarkable diary, penned by the legendary poet and courtier Fujiwara no Teika (1162–1241), offers an unparalleled window into the tumultuous world of Kamakura-period Japan. Spanning over five decades of meticulous entries, the Meigetsuki is far more than a personal journal — it is a first-class historical document, a work of exquisite calligraphy, and even an important record for modern astronomy.

Who Was Fujiwara no Teika?

Fujiwara no Teika (also read as "Sadaie") stands as one of the most influential figures in the history of Japanese literature. Born into the prestigious Mikohidari branch of the Fujiwara clan, he inherited the mantle of poetic mastery from his father, Fujiwara no Shunzei, and elevated waka poetry to new artistic heights. Teika is perhaps best known today as the compiler of the Hyakunin Isshu (百人一首), the beloved anthology of one hundred poems by one hundred poets that remains a staple of Japanese New Year celebrations.

Beyond poetry, Teika was a tireless copyist and scholar who transcribed and preserved countless classical texts. His distinctive calligraphic style, later known as "Teika-yō," became so revered that fragments of his handwriting were sought after as artistic treasures in their own right. The Meigetsuki, written primarily in classical Chinese (kanbun), showcases Teika's elegant yet expressive brushwork across thousands of pages.

What Is the Meigetsuki?

The Meigetsuki is Teika's personal diary, believed to have been written from around 1180, when he was approximately 18 years old, until near his death in 1241 at the age of 80. The portion preserved at the Reizei Family Shiguretei Library consists of 58 scrolls and one hanging scroll fragment, covering approximately 25 years of entries — from 1192 to 1233 — organized roughly by season in three-month intervals.

The diary was written on kōzo (mulberry) paper that had been polished smooth, with entries organized chronologically by date. Teika himself compiled and edited these entries into fair copies, and the manuscripts bear numerous corrections, additions, and deletions in his own hand. Some portions were transcribed under Teika's direct supervision by his close attendants.

Remarkably, the reverse sides of 34 scrolls contain approximately 600 letters and documents — known as shihai monjo (紙背文書) — many of them addressed to Teika. These "paper-back documents" serve as invaluable supplementary sources that further illuminate the world depicted in the diary itself.

Why Was It Designated a National Treasure?

The Meigetsuki was first designated as an Important Cultural Property in 1982. Following a painstaking 12-year restoration project that began in 1988, which made the previously unreadable paper-back documents accessible for the first time, it was elevated to National Treasure status on June 27, 2000.

Several factors contributed to this prestigious designation:

• As an autograph manuscript by one of Japan's greatest literary figures, it offers direct contact with the mind and hand of Fujiwara no Teika across eight centuries.
• It is a primary historical source of the highest order for understanding the Kamakura period, documenting the upheavals from the Genpei War through the Jōkyū Disturbance and beyond.
• The approximately 600 paper-back documents provide an extraordinary archive of correspondence and official documents from the early 13th century.
• Its astronomical records, including references to historical supernovae, have proven invaluable to modern science.
• As a masterpiece of calligraphy in the distinctive Teika style, it holds immense artistic value.

A Window into Kamakura-Period Japan

The Meigetsuki vividly captures one of the most dramatic periods in Japanese history. Teika lived through the transition from aristocratic to warrior rule, and his diary records the realities of court life with unflinching honesty. He documents political intrigues, ceremonial protocols, literary competitions, personal rivalries, and the everyday concerns of a nobleman navigating an era of profound change.

Teika's entries range from grand historical events to deeply personal reflections. He records his literary activities, including his involvement in compiling imperial anthologies and his famous disputes with Retired Emperor Go-Toba. He also writes candidly about his health problems, financial worries, and the hardships of ordinary life during times of famine and social upheaval.

Astronomical Records: Supernovae in an Ancient Diary

One of the most fascinating aspects of the Meigetsuki is its contribution to modern astronomy. The diary contains records of unusual celestial phenomena — considered ominous signs in the cosmology of the time — that were compiled from reports by court astronomers (onmyōji).

Most notably, the Meigetsuki includes a reference to the supernova explosion of 1054 AD (SN 1054), the cataclysmic stellar event that created what we now know as the Crab Nebula in the constellation Taurus. Although this event occurred more than a century before Teika's birth, he recorded it based on historical astronomical reports, providing one of only a handful of known written records of this landmark cosmic event from anywhere in the world.

The diary also contains a record of the supernova of 1006 AD (SN 1006), which appeared in the constellation Lupus. These entries have proven essential for astrophysicists studying the expansion rates and ages of supernova remnants, making the Meigetsuki a bridge between medieval Japanese court culture and cutting-edge space science.

The Reizei Family: 800 Years of Guardianship

The survival of the Meigetsuki is inseparable from the remarkable story of the Reizei family. Descended from Teika's grandson, Reizei Tamesuke, the family has maintained an unbroken tradition as custodians of poetry and classical learning for over 800 years. Their residence, located just north of the Kyoto Imperial Palace grounds, is the only surviving aristocratic (kuge) mansion from the pre-modern era, and is itself designated as an Important Cultural Property.

Within the Reizei compound stands the Obunko (御文庫), a sacred storehouse that for centuries was accessible only to the family head and his heir. It was here that the Meigetsuki and countless other priceless manuscripts were preserved through wars, fires, earthquakes, and the upheavals of modernization.

When most aristocratic families followed the Emperor to Tokyo during the Meiji Restoration, the Reizei family remained in Kyoto as caretakers of the Imperial Palace, a decision that proved crucial for the preservation of their extraordinary collection. In 1981, the Reizei Family Shiguretei Library Foundation was established to ensure the long-term conservation and scholarly study of these treasures. The foundation's name, "Shiguretei" (時雨亭), refers to Teika's mountain retreat in the Saga district of Kyoto, where he is said to have compiled the Hyakunin Isshu.

Visiting the Reizei Family Residence

The Reizei family residence is located on Imadegawa-dōri, just east of the Karasuma intersection, sandwiched between the campuses of Doshisha University. While the residence is normally closed to the public, it opens for special viewings a few days each year, typically during Golden Week in spring and during the Kyoto Non-Public Cultural Properties Special Exhibition in autumn (usually late October to early November).

During these rare openings, visitors can view the exterior and interior of the historic residence, including the impressive yakuimon gate adorned with tortoise roof tiles representing the guardian deity Genbu. The Obunko storehouse, where the Meigetsuki is preserved, can be seen from the garden, though the storehouse interior remains off-limits to all but the family head.

Fragments and portions of the Meigetsuki are occasionally displayed at major museums, including the Tokyo National Museum and the Kyoto National Museum, as part of special exhibitions on Japanese calligraphy and medieval manuscripts. Checking museum exhibition schedules before your trip is recommended.

Surrounding Attractions

The Reizei family residence is situated in one of Kyoto's most culturally rich neighborhoods. The Kyoto Imperial Palace and its expansive park, Kyoto Gyoen, lie directly across Imadegawa-dōri to the south and offer peaceful strolling grounds with seasonal beauty throughout the year. Nearby Shōkoku-ji, one of Kyoto's great Zen temples founded in 1382, houses its own impressive art collection at the Jōtenkaku Museum.

A short walk east brings you to the Kamo River and the charming neighborhood of Demachiyanagi, where the Kamo and Takano rivers merge. The area is a beloved spot for locals and home to the historic Shimogamo Shrine (a UNESCO World Heritage Site). Heading west along Imadegawa-dōri, you can reach Kitano Tenman-gū, the shrine dedicated to the deity of learning, and the atmospheric geisha district of Kamishichiken.