Artifacts from Shibagahara Kofun, Kyoto: Treasures from the Dawn of Ancient Japan
Hidden in a quiet residential neighborhood in Joyo City, just south of Kyoto, lies a burial mound that rewrote the timeline of Japanese history. Shibagahara Kofun — one of the oldest tombs in the entire country — yielded a stunning collection of grave goods that have been designated as an Important Cultural Property of Japan. These artifacts, dating to the early 3rd century, offer a rare and intimate glimpse into the transition from the Yayoi period to the Kofun era, a time when the legendary Queen Himiko is said to have ruled.
What Is Shibagahara Kofun?
Shibagahara Kofun (formally designated as Shibagahara Tomb No. 12) is a "zenpo-koho-fun" — a keyhole-shaped tomb with a square rear mound and a rectangular front projection. Located on a hilltop in the northern part of Joyo City, it overlooks the alluvial fan of the Otanigawa River. The tomb is part of the larger Kutsukawa Kofun Cluster, one of the largest ancient burial groups in Kyoto Prefecture with nearly 100 tombs spanning from the 3rd to 6th centuries.
The rear mound measures 21 meters north-south and 19 meters east-west, while the front section was largely destroyed by road construction before excavation. The tomb was discovered and excavated in 1986 by the Joyo City Board of Education during a residential development survey. The burial chamber contained a joined wooden coffin (kumiai-shiki mokkan), approximately 3 meters long and 0.8 meters wide, placed directly in a pit measuring 4.7 meters by 2.5 meters.
The Excavated Artifacts: An Extraordinary Collection
The assemblage of artifacts found inside the wooden coffin and atop the burial pit is what makes Shibagahara Kofun truly exceptional. These items, collectively designated as an Important Cultural Property of Japan in 1990, include:
- Dōkushiro (Bronze Bracelets): Two bronze arm rings modeled after limpet shell bracelets (kasagai). With 72 radial ribs and alternating projections along the outer rim, these are the most faithful bronze reproductions of shell bracelets ever found in Japan — and the only complete examples of their kind nationwide.
- Shijūkeikyō (Four-Beast Mirror): A 12-centimeter bronze mirror featuring four stylized beast figures in relief. This is one of the earliest Japanese-made mirrors (bōseikyō) imitating Chinese prototypes, offering key evidence of early cultural exchange.
- Jadeite Magatama: Eight comma-shaped beads carved from jadeite (kōgyoku), symbolizing power and spiritual authority.
- Jasper Tubular Beads: 187 cylindrical beads made of green jasper (hekigyoku), demonstrating sophisticated lapidary skills.
- Glass Beads: Over 1,276 tiny glass beads (kodama), likely strung together as elaborate necklaces or decorations.
- Iron Tools: A yariganna (spear-shaped plane) and awl fragments, indicating the owner's access to advanced metalworking technology.
On the gravel surface atop the burial pit, Shōnai-style pottery — including double-rimmed jars and footed cups — was discovered. These vessels represent a transitional ceramic style between the Yayoi and Kofun periods, and the examples from Shibagahara display particularly archaic characteristics within the Shōnai tradition.
Why Were These Artifacts Designated as an Important Cultural Property?
The collection was designated as an Important Cultural Property (Jūyō Bunkazai) on June 29, 1990, for several compelling reasons. First, the bronze bracelets (dōkushiro) are unparalleled: no other site in Japan has produced complete examples of this specific form, which closely replicates the shape of natural limpet shell bracelets from the Yayoi period. Their discovery provided critical evidence about the ritualistic practices of early chieftains.
Second, the four-beast mirror represents one of the earliest examples of Japanese-produced imitation mirrors, shedding light on the development of local bronze-casting traditions during the formative years of the Kofun period. Third, the combination of all these artifacts — bronze, jade, jasper, glass, and iron — within a single burial from such an early date paints a vivid picture of a powerful local leader with connections to wide-reaching trade networks. This assemblage is indispensable for understanding how political authority and funerary customs developed at the very beginning of the Kofun era.
Highlights and What Makes This Collection Special
The star of the collection is undoubtedly the pair of bronze bracelets. These ornate arm rings were found near the head of the deceased, carefully placed alongside the mirror and beads rather than worn on the body. This arrangement suggests they may have served a ceremonial purpose, perhaps as symbols of the chieftain's authority. A life-size panel installed at the nearby historic park depicts the buried leader holding aloft one of these bracelets as a symbol of power.
The sheer quantity and variety of beads — nearly 1,500 pieces combining jade, jasper, and glass — is also remarkable for a tomb of this early date. The use of jadeite, likely sourced from the Itoigawa region far to the north, indicates extensive trade connections. Meanwhile, the Shōnai-style pottery provides a precise chronological anchor, placing the tomb firmly in the first half of the 3rd century and making it contemporary with the era of the Yamatai kingdom described in Chinese historical texts.
Where to See the Artifacts
The excavated artifacts are permanently displayed at the Joyo City Historical Folk Museum (Gori-gori-kan), located within the Bunka Paruku Joyo cultural complex. The museum's charming nickname comes from Joyo's position exactly "five ri" (approximately 20 kilometers) from both the ancient capitals of Kyoto and Nara. The permanent exhibition traces the history of Joyo from the Paleolithic era to modern times, with the Shibagahara artifacts forming a centerpiece of the ancient history section. Visitors can also see a full-scale replica of the stone coffin from the nearby Kutsukawa Kurumazuka Kofun, the largest keyhole-shaped tomb in the southern Yamashiro region.
The tomb itself has been preserved as a historic park. While the front section was lost to development, the restored rear mound is accessible and surrounded by informational panels explaining the tomb's significance, including details about the front-rear square tomb form and its relationship to the broader Kutsukawa tomb cluster.
Surrounding Area and Nearby Attractions
Joyo City offers a surprisingly rich archaeological landscape for visitors interested in ancient Japan. The Kutsukawa Kurumazuka Kofun, a massive 180-meter keyhole-shaped tomb from the 5th century, is visible from the Shibagahara site and is a designated National Historic Site. The Shōdō Kanga ruins, a Nara-period government office complex, are located just 250 meters south of the Shibagahara tomb.
For those wishing to explore further afield, the city of Uji — home to the UNESCO World Heritage Sites of Byōdō-in Temple and Ujigami Shrine — is only a short train ride to the north. Uji is also famous for its premium green tea, making it easy to combine an archaeological itinerary with a traditional tea experience. Kyoto's main temples and shrines are accessible within about 30 minutes by train from Joyo.
- 📍 Plan Your Visit to Kyoto
- Find tours, activities & transport passes near Artifacts Excavated from Shibagahara Tomb in Kyoto
- [ Kinkakuji Fushimi Inari & Kimono Rental ]
Q＆A
- Are the artifacts from Shibagahara Kofun on permanent display?
- Yes. The key artifacts, including the bronze bracelets and four-beast mirror, are displayed in the permanent exhibition at the Joyo City Historical Folk Museum (Gori-gori-kan). Special exhibitions featuring the collection are also held periodically.
- Can I visit the actual Shibagahara Kofun tomb?
- Yes. The tomb has been restored and maintained as a public historic park. You can view the mound from outside the fenced area, read the informational panels, and see a life-size figure panel of the ancient chieftain. The park is a 10-minute walk east from Kutsukawa Station on the Kintetsu Kyoto Line.
- Is English information available at the museum?
- The museum displays are primarily in Japanese. It is recommended to research the artifacts beforehand or use a translation app. The artifact labels include the names of items in both Japanese and academic terminology that archaeology enthusiasts will recognize.
- What makes the bronze bracelets so special?
- The bronze bracelets (dōkushiro) from Shibagahara are the only known complete examples of their specific type in all of Japan. They faithfully replicate the shape of natural limpet shell bracelets, with 72 radial ribs and alternating projections. This makes them invaluable for understanding the ritual practices and status symbols of early Kofun-period chieftains.
- How old are the artifacts?
- The artifacts date to the early 3rd century (approximately 200–250 CE), placing them in the transitional period between the Yayoi and Kofun eras. This makes them roughly contemporary with the era of Queen Himiko and the Yamatai kingdom described in Chinese historical records.
Basic Information
| Designation | Important Cultural Property of Japan (Archaeological Material) |
|---|---|
| Official Name | Artifacts Excavated from Shibagahara Kofun, Kyoto Prefecture (京都府芝ケ原古墳出土品) |
| Date of Designation | June 29, 1990 |
| Period of Origin | Early Kofun period, early 3rd century (ca. 200–250 CE) |
| Main Artifacts | Bronze bracelets (2), Four-beast mirror (1), Jadeite magatama (8), Jasper tubular beads (187), Glass beads (1,276+), Iron yariganna (1), Awl fragments, Shōnai-style pottery |
| Repository | Joyo City Historical Folk Museum (Gori-gori-kan) |
| Museum Address | Bunka Paruku Joyo, Terada Imabori, Joyo City, Kyoto Prefecture |
| Museum Hours | 10:00 AM – 5:00 PM (last entry 4:30 PM) |
| Closed | Mondays (or following day if Monday is a holiday), day after national holidays, Dec 28 – Jan 4 |
| Admission | Adults: ¥200 / Children (elementary & junior high): ¥100 |
| Access | 5-minute walk south from Terada Station (Kintetsu Kyoto Line); Tomb site: 10-minute walk east from Kutsukawa Station (Kintetsu Kyoto Line) |
| Tomb Designation | National Historic Site (designated 1989, expanded 2012) |
| Tomb Location | Terada Otani, Joyo City, Kyoto Prefecture |
References
- 芝ヶ原古墳 - Wikipedia
- https://ja.wikipedia.org/wiki/%E8%8A%9D%E3%83%B6%E5%8E%9F%E5%8F%A4%E5%A2%B3
- 芝ヶ原古墳 - Cultural Heritage Online (bunka.nii.ac.jp)
- https://bunka.nii.ac.jp/heritages/detail/191202
- 京都府芝ケ原古墳出土品 - Cultural Heritage Online (bunka.nii.ac.jp)
- https://bunka.nii.ac.jp/heritages/detail/207050
- National Designated Cultural Properties Database (kunishitei.bunka.go.jp)
- https://kunishitei.bunka.go.jp/heritage/detail/201/10078
- 史跡芝ｹ原古墳 - Ocha no Kyoto
- https://ochanokyoto.jp/spot/detail.php?sid=192
- 日本最古級の「出現期古墳」が、京都府に！ - tabi-mag.jp
- https://tabi-mag.jp/shibagahara/
- 芝ヶ原古墳 - 墳丘からの眺め
- https://massneko.hatenablog.com/entry/2024/05/06/210542
- ２ 銅釧をかがげる首長 | 城陽市
- https://www.city.joyo.kyoto.jp/0000003939.html
- 城陽市歴史民俗資料館 - Cultural Heritage Online
- https://bunka.nii.ac.jp/museums/detail/14043
- 開館時間・休館日・観覧料金 | 城陽市
- https://www.city.joyo.kyoto.jp/0000003339.html
Last verified: 2026.03.02