Eta Funayama Kofun is an ancient keyhole-shaped burial mound located in Nagomi Town, Tamana District, Kumamoto Prefecture, formerly part of Kikusuimachi. Built between the late fifth and early sixth centuries, the mound measures approximately 62 meters in length and is one of the most important archaeological sites for understanding Japan’s ancient history.
The tomb is especially famous for the remarkable collection of grave goods discovered inside it, including a sword bearing a 75-character inscription inlaid with silver. The inscription provides valuable evidence of political relationships during the Kofun period, when powerful regional leaders were connected with the emerging Yamato court. The sword and other objects discovered at the site have become important cultural treasures.
Eta Funayama Kofun is designated a National Historic Site of Japan. Its archaeological significance extends beyond the local region, offering insights into ancient craftsmanship, social hierarchy, warfare, and the political networks that linked Kyushu with other parts of the Japanese archipelago.
Eta Funayama Kofun is the largest and oldest burial mound in the Seibaru Kofun Group. Its scale and the quality of the objects buried within it suggest that the individual interred there was a powerful regional leader who held an important position in the society of the time.
The mound was first excavated in 1873, during the Meiji period. The excavation revealed numerous grave goods, including weapons, armor, ornaments, and a mirror. Some of these objects are designated National Treasures and are now preserved mainly at the Tokyo National Museum.
Among the discoveries, the silver-inlaid sword is particularly important because its inscription contains information about the political authority associated with the ruler known as Wakatakeru. The inscription has become a key source for studying the relationship between regional leaders in Kyushu and the Yamato court.
Eta Funayama Kofun is a keyhole-shaped tomb, a characteristic form of large burial mound built during Japan’s Kofun period. Its construction is generally dated to the late fifth or early sixth century.
The mound is approximately 62 meters long and is surrounded by a moat with a shield-like outline. A stone coffin was placed near the top of the mound, forming part of the burial arrangements for the deceased.
The moat and the overall shape of the mound demonstrate the scale of the construction project and the resources required to build it. The tomb also provides evidence of the ceremonial practices and burial customs of powerful leaders during the period.
Stone figures known as sekijin were placed around the burial mound. These figures represent warriors wearing protective armor, including short cuirasses. The use of stone figures and stone horses is a distinctive feature found at a number of ancient burial mounds in Kyushu.
These figures are important because they reveal regional characteristics in Kofun-period funerary practices. They also offer clues about the symbolic role of warriors, weapons, and military authority in the society of the time.
Considering the size of the mound, its stone coffin, the surrounding moat, and the richness of the grave goods, Eta Funayama Kofun is generally understood to have been the tomb of a prominent regional chief rather than an ordinary member of the community.
The most famous object discovered at Eta Funayama Kofun is a sword bearing an inscription inlaid with silver. The inscription contains 75 characters and is regarded as one of the earliest substantial written records preserved in Japan.
Among the most important details is the reference to the great king known as Wakatakeru, generally identified with Emperor Yuryaku. The name is also found on an iron sword discovered at Inariyama Kofun in Gyoda City, Saitama Prefecture. The appearance of the same ruler’s name on objects found in distant regions provides significant evidence of the reach of the Yamato court during the fifth century.
The discovery therefore offers a valuable link between the political history of central Japan and the history of northern Kyushu. It suggests that regional leaders were connected to a wider political network extending across much of the archipelago.
The sword’s inscription begins with a reference to the reign of the great king who ruled the world, followed by details concerning a person serving in an official capacity. It also describes the manufacture of a fine sword and includes a wish for longevity, prosperous descendants, and lasting blessings for its owner.
The inscription contains references to the sword’s maker, whose name is partly uncertain, and to a person identified as Zhang An, described as the writer of the inscription. Some characters remain difficult to interpret, and portions of the text are reconstructed by scholars.
For a long time, the inscription was difficult to decipher. Its relationship with the inscription on the iron sword from Inariyama Kofun became clearer after that sword was discovered and studied in 1978. The parallel reference to Wakatakeru helped researchers establish an important connection between the two finds and strengthen the identification of the ruler named in the inscription.
The silver-inlaid sword is designated a National Treasure and remains one of the most important objects associated with Eta Funayama Kofun. Its historical value lies not only in its craftsmanship but also in the written evidence it preserves about political authority and the manufacture of weapons in ancient Japan.
Eta Funayama Kofun yielded a diverse collection of burial objects that illuminate the wealth, status, and cultural connections of the person buried there. Alongside the silver-inlaid sword, the discoveries included other swords, armor, a decorated crown, a mirror, and personal ornaments.
A number of the objects are collectively designated as National Treasures under the title Grave Goods from Eta Funayama Kofun in Higo. Much of this collection is held by the Tokyo National Museum, where it can be studied as part of Japan’s ancient cultural heritage.
The principal grave goods include the following objects:
Silver-inlaid inscribed sword: The famous sword carrying a 75-character inscription, which provides important written evidence of the political relationships of the Kofun period.
Gold-and-silver inlaid sword with a dragon-patterned pommel: A decorated weapon whose elaborate design reflects the high level of metalworking skill available to powerful individuals during the period.
Silver-mounted sword with a ring-shaped pommel: Another sword demonstrating the craftsmanship and decorative traditions associated with elite burials.
Mirror depicting divine figures, a chariot, and horses: A mirror decorated with imagery that offers insights into the artistic and symbolic traditions of ancient Japan and its wider cultural connections.
Jewelry made from hard jade, glass beads, and tubular beads of jasper: These ornaments reveal the importance of personal adornment and the use of valuable materials in elite society.
Gold earrings and a decorated crown: Precious ornaments that help illustrate the status of the deceased and the sophistication of contemporary metalworking.
Armor and weapons: These include iron helmets with projecting neck guards, armor, and iron arrowheads. Such objects provide evidence of military equipment and the martial identity associated with the tomb.
Taken together, the grave goods offer a rare and detailed picture of elite life during the fifth and sixth centuries. Their combination of weapons, ornaments, and ceremonial objects suggests a society in which military authority, political connections, and personal prestige were closely linked.
The modern history of research at Eta Funayama Kofun began in 1873, when a local man named Sato Ikeda excavated the mound. According to the account preserved about the discovery, he began the excavation after receiving an indication in a dream.
The excavation uncovered numerous valuable objects. The Meiji government subsequently purchased the discoveries from Ikeda, helping ensure that the objects entered public collections and could be preserved for future study.
The discovery was particularly significant because the artifacts included objects that would later be recognized as National Treasures. Their exceptional quality attracted attention to the tomb and established its importance as an archaeological site.
In 1951, Eta Funayama Kofun was designated a National Historic Site of Japan. Subsequent archaeological investigations continued to clarify the mound’s construction and its relationship with the surrounding landscape.
In particular, a survey conducted in 1975 confirmed the existence of the moat surrounding the burial mound. This discovery provided additional evidence about the original design and the extent of the tomb’s earthworks.
In 1976, two nearby burial mounds, Tsukabozu Kofun and Kokuzozuka Kofun, were also added to the designated historic site. Their inclusion helped protect the wider archaeological setting and recognize the significance of the surrounding burial mound group.
The continued investigation of the site has contributed to a broader understanding of the Kofun period, when large burial mounds served as monumental expressions of political authority and social rank.
From Tamana Station or Shin-Tamana Station, take a Kyushu Sanko Bus bound for Yamaga Onsen. Get off at the Kikusu Roman-kan-mae bus stop and walk approximately three minutes, or about 230 meters, to the burial mound.
From Kikusu Interchange on the Kyushu Expressway, the site is approximately 2.5 kilometers away.
Eta Funayama Kofun is an essential destination for visitors interested in ancient Japan. Its monumental form, shield-shaped moat, stone figures, and remarkable collection of grave goods reveal the sophistication of the society that flourished in Kyushu more than 1,400 years ago.
The silver-inlaid sword is especially important because its inscription provides rare written evidence linking a regional leader in Higo with the wider political authority of the Yamato court. Together with the weapons, armor, mirror, jewelry, and other objects discovered at the site, it offers a vivid picture of the relationships between power, warfare, craftsmanship, and ritual in the Kofun period.
Visiting the mound and learning about the archaeological discoveries provides a meaningful way to explore the ancient history of Kumamoto and understand how the region was connected to the development of early Japan.