Yamato

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Around the middle of the third century, in the flat basin south of the mountains that ring the modern city of Nara, the ground began to be reshaped into the form of a single will. At Makimuku, a planned settlement spread across roughly two and a half kilometers, laid out before anything in the islands had earned the name of a capital; and at its edge rose Hashihaka, the first of the great mounds — a tomb in the shape of a keyhole, a round burial chamber joined to a long triangular forecourt, built on a scale that demanded the coordinated labor of thousands. From this basin the polity called Yamato took its name and its center. Over the next four and a half centuries it would grow from a confederation of mound-building chieftains into a Chinese-style monarchy with a written law code, a Buddhist clergy, and a capital city laid out on a grid — and a throne whose holders would trace their descent, in an unbroken line of the tradition’s own reckoning, all the way back to the sun.

Yamato is the early Japanese state of two archaeological-historical ages: the Kofun period (from roughly 250 CE), named for its tombs, and the Asuka period (conventionally from 538 CE), named for the valley south of Nara where the court sat during its turn toward the continent. The two together run to 710, when the court moved into the first true city, and the Nara period began. The whole span is the formation of Japan as a state and as a sacred order at once: the same centuries that produced the imperial mausolea produced the worship of the kami and the descent-myth that placed the ruler at the meeting point of heaven and land.

The mounds and the kingship they announce

A kofun is, literally, an “old mound” — a constructed tumulus raised over a burial. They were built by the tens of thousands across the archipelago; some 160,000 survive. But the form that signals Yamato is specific: the zenpō-kōen-fun, “front-square, rear-round tomb,” a circular mound for the burial chamber wedded to a flat trapezoidal platform, so that seen from above the whole resembles a keyhole. The form is found in Japan and nowhere else, and its appearance is not a fashion but a claim. The largest examples could only be raised by a power able to command labor, surplus, and skilled engineering across a wide territory; their distribution, radiating outward from the Nara basin and shrinking in size with distance from the center, maps the reach of Yamato authority like a diagram of rank.

The colossal phase came in the fifth century, when the tombs left the basin for the Osaka plain. The Daisen Kofun at Sakai — traditionally the resting place of the ruler later called Emperor Nintoku — runs some 486 meters in length, a mound longer than any pyramid is tall, ringed by moats and set among scores of smaller tombs in what is now the Mozu group. Together with the neighboring Furuichi cluster it was inscribed as a UNESCO World Heritage Site in 2019, the Mozu-Furuichi tombs, selected from the whole field of Japanese kofun as the richest surviving record of the age. Four mound-shapes — keyhole, scallop, square, round — descend in a hierarchy of rank, the keyhole reserved for the highest.

The mounds were not bare earth. Their slopes and terraces were lined with haniwa: unglazed terracotta forms set on the outside of the tomb rather than buried with the dead. The earliest were plain cylinders, set in rows to ring and hold the mound; from the fourth century they bloomed into figures — warriors in armor, robed attendants, dancers, horses and birds, houses, boats, shields and quivers. Standing on the surface where the living could see them, they marked the precinct as sacred and peopled the ruler’s death with a retinue carried over into whatever came next. What the chambers held — the bronze mirrors, the curved magatama beads, the iron swords and the lavish gilt-bronze horse trappings of the later mounds — was the equipment of a warrior aristocracy that drew its prestige, and much of its metal, from across the sea.

For the imperial mounds, the equipment inside is largely a matter of inference, because the largest cannot be entered. Many great kofun are administered by the Imperial Household Agency as ryōbo, imperial mausolea — identified, by long tradition rather than by excavation, with named sovereigns of the chronicle list. They remain active sites of imperial ritual, closed to the public and generally to the spade. The identifications are in many cases uncertain, and the restriction has long frustrated archaeologists; but the tombs are treated as the living graves of a house that reckons itself continuous, not as ruins, and that status is itself a fact about Yamato — the one polity whose mortuary monuments are still, after fifteen centuries, under the care of a court that claims the mound-builders as its own ancestors.

The makers themselves left no writing. The Yamato of the mounds is read from the earth and from the notices of foreign chroniclers — above all the third-century Chinese histories that describe a country of Wa ruled by a shaman-queen, Himiko, who sent embassies to the Wei court and was buried under a great mound. The identification of Himiko’s grave with the Hashihaka tomb, whose dates fall close to her recorded death around 248, is argued but unproven; it sits on the seam where the legendary genealogy of the chronicles and the datable record of archaeology touch without quite joining.

Kami, descent, and the order of the sacred

Beneath and around the mound-building ran a religious life older than the state and never fully separable from it: the veneration of kami. The word resists a single translation. A kami is a presence that commands awe — a mountain, a waterfall, a great tree, a storm, a fertile field, a remarkable ancestor, a force that exceeds the ordinary. The early cult had no founder, no scripture, and no fixed name; its practice was offering, purification, and the marking of sacred ground, and its temper was less doctrine than relationship — keeping right with the powers that fill the visible world. Only much later, when a foreign religion arrived and required a contrasting term, would this native strand be gathered under the name Shinto, “the way of the kami.”

What Yamato did with the kami was political as well as devotional. As the basin chieftains became a paramount line, their genealogy was raised into a cosmology. The ruling house traced itself to the sun goddess Amaterasu, enshrined at Ise, and through her to the generating powers of the world; the first sovereign, Jimmu, was set in deep mythic time as her descendant, and every ruler after him as the unbroken continuation of that line. The sovereign was thus not merely the strongest of the chiefs but the kami-descended officiant who alone could mediate between the heavenly powers and the land — a sacral kingship in which rule and rite were one office.

This descent-ideology received its classic statement only at the very end of the Yamato age, when the court turned to writing it down. The Kojiki, “Record of Ancient Matters,” was presented in 712: begun under Emperor Tenmu, who had a court reciter named Hieda no Are commit the imperial traditions to memory, and completed when Empress Genmei had the courtier Ō no Yasumaro set them down in Chinese characters. The Nihon Shoki, “Chronicles of Japan,” followed in 720 as the court’s official history, compiled by a commission under Prince Toneri. Together these texts run from the generation of the gods through the descent of the imperial line to the reigns of historical sovereigns. They are the tradition’s own account of itself — a sacred genealogy, not a documentary chronicle of the third century — and their mythic opening and their imperial close are a single argument: that the throne of Yamato is the earthly terminus of a chain reaching back to the powers that made the islands.

The turn outward: Buddhism and the Chinese state

The islands were never sealed. Iron, mirrors, horses, and the artisans who worked them came across the straits throughout the Kofun age, and with the goods came people. Waves of toraijin — immigrants from the Korean peninsula and, through it, from China — settled in the Yamato heartland from the late fourth century onward, bringing the potter’s techniques of high-fired gray sue ware, advanced metalworking and weaving, the lunar calendar, the practice of writing, and the literate skills of the scribe and the accountant. Yamato cultivated its ties to the peninsular kingdoms — Baekje above all, but also Gaya and Silla — partly for iron and partly for the prestige and learning of the mainland. It was along this Baekje channel that the decisive import arrived.

Buddhism — the teaching descended from the Buddha and by then a thousand years into its spread across Asia — reached the Yamato court as a gift of state. The king of Baekje sent an image of the Buddha and a set of Buddhist scriptures to the sovereign of Yamato; the Nihon Shoki dates the embassy to 552, while another early source, the records associated with Prince Shōtoku, gives 538. Both dates fall within a single generation, and the question of which is exact matters less than what the gift provoked. The new religion split the court. The Soga clan, deeply tied to the continental immigrants, took up the foreign teaching and its image; the Mononobe, guardians of the court’s kami rites, opposed it as an insult to the native powers that would bring their wrath. The dispute was settled by force: in 587 the Soga defeated the Mononobe in arms, and Buddhism was secured a place at the center of the state.

The decades that followed are the Asuka period proper, the age of the court’s wholesale reorganization on continental lines. Under the regent Prince Shōtoku, remembered as the great patron of the new faith and the builder of its first monasteries, the court adopted in 603 a system of twelve cap-ranks whose names were drawn from the Confucian virtues — moral excellence, benevolence, decorum, fidelity, righteousness, wisdom — and the following year a set of moral injunctions for officials known as the Seventeen-Article Constitution, an exhortation to harmony, to reverence for the Buddhist teaching, and to the obedience a ruler is owed. Embassies were sent across the sea to the Sui and then the Tang courts of China to study a working empire at its source. What Yamato imported was a whole apparatus of governance whose elements had matured under the Han and after: a bureaucracy of graded officials, a census and land system, written law, and the ideological grammar of Confucian order and the Way — fitted onto a throne that remained, in its own self-understanding, kami-descended.

The reorganization deepened across the seventh century. The Taika Reform of 645 began the move toward a centralized state on the Chinese model, asserting the crown’s claim over land and people; the upheaval of the Jinshin War of 672 brought Tenmu to the throne and to a concentration of imperial authority that the chronicle-writing of his reign was meant to consecrate. The accumulating statutes were codified into the ritsuryō — penal and administrative law on the Tang pattern — and brought to completion in the Taihō Code of 701, which set the mature bureaucratic state in writing. It was in roughly these years that the realm took for itself the name Nihon, “origin of the sun.” The keyhole tombs, meanwhile, had already ceased to be built: the colossal mound, the older language of a ruler’s greatness, was abandoned for the temple and the law-court as the new monuments of power, and the elite who had once been buried under earth were now commemorated in Buddhist rites.

By the time the Buddhist institution stood firm and the ritsuryō state was codified, the court had outgrown the temporary palaces that each sovereign had built and abandoned. In 710 the government moved into Heijō-kyō, on the site of present-day Nara — a planned capital laid out on the grid of Tang Chang’an, with broad avenues and a fixed palace meant to outlast any single reign. The move closes the Yamato age and opens the Nara period. The keyhole mounds in the basin to the south had by then fallen silent; the gods of the Kojiki had just been set into writing; and the sun-descended throne that the mound-builders had raised in the third century now ruled from a Chinese-style city under a Chinese-style code, a Buddhist clergy chanting in its temples and the old kami served at their shrines a few valleys away — native rite and continental statecraft held together in one office, which was the particular shape the throne had taken by the time it walked through the gates of its first real city.

Reading the record

The Yamato of the chronicles and the Yamato of the soil are two bodies of evidence that scholars have spent more than a century trying to align. The Kojiki and Nihon Shoki survive in the tradition’s own keeping; the nineteenth-century English version of the latter, W. G. Aston’s Nihongi, remains the standard gateway in translation, while the descent-mythology it records is studied as the founding charter of the imperial cult rather than as a report of third-century events. Against the texts stands the archaeology, which has its own independent chronology of pottery, tomb-form, and grave goods — and which the restriction of the imperial mausolea leaves frustratingly incomplete at exactly its most important monuments.

The mortuary record is the heart of the field. Ishino Hironobu’s study “Rites and Rituals of the Kofun Period”, in the Japanese Journal of Religious Studies (1992), reads the tombs and their haniwa as evidence for the ritual life and the emerging ruler-cult of the mound-building elite. The state-formation question — how a confederation of chieftains became a monarchy — is treated in Gina Barnes’s State Formation in Japan and Joan Piggott’s The Emergence of Japanese Kingship, and synthesized across the period in the first volume of The Cambridge History of Japan. The contested “horserider theory” of Egami Namio, which would derive the Yamato elite from a continental mounted conquest, is now generally set aside; the consensus favors a homegrown coalescence drawing heavily, but not by conquest, on peninsular skill and trade.

The continental tie has become a field of its own. The movement of toraijin into the Yamato heartland, and the technologies and literacy they carried, is the subject of recent open-access scholarship such as the Archaeology and History of Toraijin survey — a reminder that the forging of the Japanese state was, from its mound-building beginnings to its Buddhist and legal maturity, the work of a court that knew exactly how much of itself had come from across the water.

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