Kofuku-Ji Temple Kondo Hall Altar

The Cache Beneath the Golden Hall

In 1874, laborers dismantling the worn altar platform of the Central Golden Hall (Chū-kondō) at Kōfuku-ji in Nara struck something unexpected in the packed earth beneath it. Out came bowls of gilt bronze and silver, polished mirrors, a small ritual implement, lumps and dust of gold, and beads of crystal, agate, and amber. They had broken into a foundation deposit that had lain sealed since the hall was first raised, around the year 710.

These objects are foundation deposits, or chindangu. When an ancient temple hall was built, offerings were placed in the ground beneath its altar to settle the spirit of the land and to pray that the structure would stand securely for generations. The same impulse survives in the jichinsai, the ground-breaking rite still performed before construction begins in Japan today.

The Kōfuku-ji find proved the richest of its kind ever recovered. The 1874 group alone amounts to roughly 1,400 individual pieces across more than thirty categories. After passing through the holdings of the early Meiji government, it entered the Tokyo National Museum, where it remains. It was listed as an Important Cultural Property in 1923 and elevated to National Treasure in 1957.

Why the Deposit Matters

Foundation deposits from Japan's early temples are not rare in themselves. Comparable caches have come from the pagoda site of Kawaradera and from beneath the Great Buddha Hall of Tōdaiji. What sets the Kōfuku-ji material apart is its sheer variety and quantity. No other temple deposit of the period combines so many kinds of object in such numbers, which makes it an unusually full record of what an eighth-century community of high status thought worth burying for the gods.

The altar of the Central Golden Hall has in fact yielded objects three separate times: in 1874, again in 1884, and once more in 2001 during an archaeological survey ahead of the hall's reconstruction. Only the 1874 group is held in Tokyo and bears this National Treasure designation. The later finds, twenty-one items of silver and crystal among them, stayed with Kōfuku-ji and carry a separate National Treasure listing of their own.

For historians of craft, the vessels are the heart of the group. The gilt bronze and silver work reflects the metalworking of the Nara court at a moment when techniques and tastes from Tang China were absorbed and reworked locally. Set beside the raw gold and the coins, the finished pieces show both the materials a temple could command and the skill brought to bear on them.

What to Look For

The vessels catch the eye first. The deposit holds four gilt bronze bowls and a single silver one, a gilt bronze footed cup, large plates in both gilt bronze and silver, and shallow dishes of sahari, a tin-rich bronze alloy that rings when struck. There are spoons of silver, one of them gilded, and a pair of slender silver tweezers, the everyday shape of ritual life rendered in precious metal.

Two mirrors deserve a close look. Both are eight-lobed, their backs cast in the Tang manner with paired motifs around a central knob, one design pairing auspicious flowers with birds, the other flowers with butterflies. The reflecting face is plain; the patterned side is what survives for us to read. One mirror is cracked. No one can say if it broke on purpose as part of the offering or simply gave way over the centuries.

Among the smaller objects is a single-pronged vajra of gilt bronze, a hand-held implement that later became central to esoteric Buddhist ritual. Its presence here, so early, is one of the quietly significant details of the group.

Then there is the wealth in plainer form. The deposit included gold dust wrapped in a packet, ten gold nuggets, nine thin sheets of gold, and silver ingots, alongside 134 Wadōkaichin coins, Japan's early currency, and a single Chinese Kaiyuan Tongbao. That lone foreign coin, minted under the Tang, is a small but useful anchor for dating the burial. Strings of agate, crystal, and amber prayer beads and a six-sided crystal container round out a collection that mixed the sacred, the precious, and the practical.

Seeing the Objects

The 1874 deposit is kept at the Tokyo National Museum in Ueno Park, and pieces from it are shown in the Japanese Gallery (Honkan), often in the room devoted to the rise of Buddhism. Because the museum rotates its displays, not every item is out at once; checking the current exhibition listing before a visit is the surest way to see a particular bowl or mirror. Ueno Park itself rewards a longer stay, with several major museums and the zoo within a short walk.

The other half of the story lies in Nara. Kōfuku-ji's Central Golden Hall, the very building these objects once protected, was reconstructed and reopened in 2018 after standing in ruins for much of the modern era. The temple's Kokuhōkan (National Treasure Museum) displays the deposits found in 1884 and 2001, together with celebrated sculptures such as the slender three-faced Ashura. Seeing the Nara holdings and the Tokyo ones gives the fullest sense of what was sealed beneath that altar.