Yayoi 2-Chome Ruins

Yayoi 2-chōme Site: where a single clay jar named an era

Almost every schoolchild in Japan learns the word Yayoi as the name of an age, the period of rice paddies, bronze, and iron that followed the long Jōmon era. Far fewer know that the word began as a Tokyo address. In March 1884 a university student picked up a reddish, thin-walled jar from a shell deposit on the eastern edge of the Hongō plateau, in a district then called Mukōgaoka Yayoi-chō. The vessel resembled nothing in the cord-marked Jōmon pottery that scholars already knew, and over the following years the neighbourhood's name fastened itself first to the pottery and then to a whole chapter of Japanese prehistory.

The Yayoi 2-chōme Site, a national Historic Site that sits inside the University of Tokyo in Bunkyō Ward, marks the ground where that happened. It is one of the rare Yayoi-period locations with a shell midden anywhere near central Tokyo, and the only spot in this built-over neighbourhood that still hints at how the land once looked.

A name that travelled from a stele to an era

The chain of names runs further back than the pottery itself. In the early nineteenth century the Mito branch of the Tokugawa family kept a villa here, and a member of the house raised a stone stele, the Mukōgaoka-ki, praising the garden in classical verse. One line used the old poetic word yayohi for the third lunar month. When the area was reorganised in 1872, planners borrowed that word for the new place name, Mukōgaoka Yayoi-chō.

So the era that opened Japan's age of metal carries, at several removes, the name of a daimyō's spring garden. The stele survives today on the university grounds, the single object that still records the Mito villa that once stood here.

The pottery entered the story in 1884. Arisaka Shōzō, then a young University of Tokyo student, found the now-famous jar while exploring the local shell midden with his fellow students Tsuboi Shōgorō and Shirai Mitsutarō, both of whom went on to shape early Japanese archaeology. Within a decade researchers had recognised that this kind of vessel belonged neither to the Jōmon nor to later periods, and the term Yayoi-style pottery, taken straight from the place name, came into use around 1896.

What the spade turned up

For nearly a century the exact find-spot of Arisaka's jar stayed uncertain. Tokyo grew over the old shell deposits, three different locations were proposed, and the precise point was lost. The decisive dig came in 1974, when the university's archaeology department excavated part of the former Asano grounds ahead of new construction.

The trenches revealed two ditches, each roughly two metres across, crossing one another along the lip of the plateau. A layer of shells had built up inside the older ditch, and beside it lay five Yayoi vessels, two jars and three wide-mouthed pots. The three elements, ditch, shell layer, and pottery, all belonged to the same late Yayoi phase. What caught specialists' attention was the shells themselves: they came from saltwater species, a reminder that the sea once reached much closer to this inland-feeling slope.

Archaeologists read the crossing ditches as part of a kangō, a defensive or boundary moat encircling a settlement, a feature increasingly recognised across the Kantō region. The houses themselves are presumed to have stood on the higher ground to the west, where the shell deposit points back toward daily life on the plateau.

Why the ground is protected

The site was designated a national Historic Site on 7 June 1976, under the category covering shell middens, settlement remains, burial mounds, and related sites. The reasoning was practical rather than romantic. Yayoi-period sites that also carry a shell midden are scarce in central Tokyo, and this excavated parcel is the one place that preserves something of the district's earlier character.

The first jar received its own protection a year earlier. In June 1975 it was named an Important Cultural Property, recognised less for beauty than for what it set in motion. A plain, broken pot became the starting point for the study of an entire culture, and that historical weight is the reason it now sits in a museum case rather than a storage drawer.

Careful visitors should keep one distinction in mind. Scholars today often separate the Jōmon-era shell midden, the old Mukōgaoka shell mound, from the Yayoi-era moated settlement excavated in 1974. The designated name, Yayoi 2-chōme Site, refers to the latter, even though the two overlap in popular memory.

What there is to see, and where the jar lives now

It helps to set expectations. There is no excavated trench to walk through and no open dig to peer into. At the boundary between the university's agriculture and engineering faculties, along Kototoi-dōri, stands a tall stone monument inscribed with the phrase that translates roughly as "ground linked to the unearthing of Yayoi pottery." It was raised in 1987, and it deliberately does not claim to mark the find-spot, since that point remains unknown. A nearby explanatory board fills in the history. The pleasure here is contemplative: standing on the slope where a chapter of the national story acquired its name.

The jar itself, listed as the Tsubo-form vessel excavated at Hongō Yayoi-chō, is held by the University of Tokyo University Museum. It is a modest object, reddish-brown and thin-walled, standing about 22 centimetres in its surviving height with a body roughly 22.7 centimetres across at the widest point. The neck and rim are missing. Its decoration, including feather-like cord impressions and small applied buttons of clay, links it more closely to pottery from the Tōkai region to the southwest than to local Kantō wares. The original is not on permanent display, so anyone hoping to see it should check the museum's current exhibitions before visiting.

Around Yayoi and Nezu

The site sits in one of the most rewarding corners of old Tokyo for a half-day on foot. The University of Tokyo's Hongō campus is a short walk uphill, where the Akamon, a vermilion gate built in 1827 for a feudal lord's bride, and Sanshirō Pond, named for the Natsume Sōseki novel, are open to the public. The University Museum on the same campus is worth a look for its rotating displays of the collection.

Downhill toward Nezu lies Nezu Shrine, whose hillside of azaleas draws crowds each spring and whose vermilion torii corridor is quieter than its famous counterparts elsewhere. A few minutes the other way, the Yayoi Museum and the adjoining Takehisa Yumeji Museum pair early-twentieth-century illustration with a calm café. Beyond them stretches the Yanaka and Nezu district, a low-rise grid of temples, old shops, and narrow lanes that survived the twentieth century largely intact.

Getting here is simple. From Nezu Station on the Tokyo Metro Chiyoda Line, leave by exit 1 and climb the slope known as Yayoi-zaka for about five minutes. Tōdaimae Station on the Namboku Line is a similar distance from the other direction.