A Baekje gift carries Buddhism to Yamato — and triggers a court war

Yamato Japan before Buddhism

In the early sixth century CE, the Yamato polity was the dominant power on the Japanese archipelago but was not yet a state in the sense the term would later acquire. The Great King (ōkimi) at the head of the Yamato confederation governed a coalition of regional aristocratic clans (uji) who controlled their own lands, their own warriors, and their own subordinate populations of farmers and craftspeople. The Yamato royal house held senior position by tradition and by control of certain prestigious continental imports — iron, horse equipment, mirrors, and silk — but it did not exercise the kind of centralized administrative control that the contemporary Sui Chinese, Baekje Korean, or Silla Korean states had begun to develop.¹

The religious life of pre-Buddhist Yamato was kami worship — the practices that would, retrospectively and partly under Buddhist influence, be organized into the religion later called Shinto. The kami were a heterogeneous category of spirits, ancestors, deified humans, deified phenomena, and place-spirits — a mountain might be a kami, a thunderstorm might be a kami, the founding ancestor of a clan might be a kami, the spirit of the rice plant might be a kami. Worship took place at sacred sites — often a mountain peak, a grove, a waterfall, or a stone — sometimes marked by a simple wooden enclosure, increasingly during the late Kofun period (c. 250–538 CE) by purpose-built shrine structures. The chief priestly clans (kuni-no-miyatsuko in some regions, imibe and nakatomi in others) descended from ancestors who had received specific kami affiliations from the Yamato founding myths.²

What kami worship had was: the maintenance of cosmic order through correct ritual conduct, the connection of clan identity to clan ancestral kami, a calendar of seasonal and agricultural festivals, and a worldview in which the human, natural, and divine were continuous. What it did not have was: organized monastic communities, written scripture, transcendental soteriology, or any institutional structure beyond the local hereditary priesthoods. Kami worship was profoundly local — even within Yamato territory, the kami of one region were not the kami of another. There was no single religious institution.

The Yamato royal house had been, by the early sixth century, increasingly exposed to continental statecraft through its relationship with the Korean kingdoms. The Baekje–Yamato relationship is documented from the late fourth century onward through inscriptions (the Inariyama Sword from 471 CE; the Eta Funayama Sword) and through the Nihon Shoki's back-projected chronology. Baekje supplied the Yamato court with iron from the Kaya states, with horse trainers, with bronze mirror specialists, and — increasingly through the fifth and early sixth centuries — with literate scribes who taught reading and writing in Chinese characters to selected members of the Yamato court.³ These scribes were the fubito class; they were partly drawn from the Korean kingdoms and were the first sustained presence of literacy at the Yamato court. Some had Buddhist sympathies, and probably small private practice, well before any official transmission.

What the Yamato court did not have, before 552, was a state-level engagement with Buddhism. The religion was known to the fubito class and through occasional Korean diplomatic visits. It was not part of state ritual. It was not patronized by the royal house. It had no dedicated buildings, no ordained Yamato monks, no Yamato-language sutras, no official place in the calendrical liturgy. King Seong's gift in 552 — a gilt bronze image of the Buddha, banners, sutras, and a recommendation — proposed to change all of that.

The transmission: a diplomatic gift with strings

The Nihon Shoki, completed in 720 by an imperial commission, records the gift with a precision the modern historian holds loosely. The chronicle gives the year 552 (the thirteenth year of Kinmei, in its lunar dating); other Japanese sources — the Gangō-ji Engi and the Jōgū Shōtoku Hōō Teisetsu — give 538 instead. Modern scholarship since Sonoda Kōyū's work has tended toward the earlier date or has treated the transmission as a process across several decades rather than a single event.⁴ What is not in dispute is that during the second quarter of the sixth century, official Buddhist objects, sutras, and a small body of ordained personnel were transferred from the Baekje court at Sabi (modern Buyeo, in southwest Korea) to the Yamato court in the Asuka basin, and that the transfer was framed by Baekje as a diplomatic gift requiring reciprocal alliance.

The geopolitical context matters. Baekje in the sixth century was under sustained military pressure from its northern neighbor Goguryeo and from the rising Silla on its east. King Seong (r. 523–554) was, like his predecessors, dependent on the Yamato alliance for both military reinforcement (Yamato troops were deployed to Korean battlefields throughout the sixth century) and for prestige. Sending the Yamato court an explicit recommendation that they adopt the religion of the great continental power was, in Baekje court understanding, the kind of cultural gift that bound the recipient into a closer alliance — and that aligned the recipient with Baekje's preferred geopolitical orientation against Goguryeo and against the increasingly powerful Sui Chinese state that would unify China in 589.⁵

The Yamato court did not accept immediately. Great King Kinmei convened his senior advisors. The Soga clan — heavily involved in continental administration, with marriage ties to the fubito literate class, and strategic interest in alignment with the Korean kingdoms — argued for acceptance. The Mononobe clan, hereditary military leaders, and the Nakatomi clan, hereditary priestly specialists in kami affairs, argued for refusal. Their argument, as the Nihon Shoki preserves it, was that the kami of Japan would be offended by the worship of foreign deities and that the price of accepting Buddhism would be paid in plagues, crop failures, and military defeats.

The argument seemed to be confirmed when, soon after the Buddha image was provisionally enshrined in a Soga family residence, a plague struck the Yamato region. The Mononobe and Nakatomi seized on this as proof. They petitioned to have the image destroyed. Mononobe no Okoshi led men to the Soga residence, threw the image into the Naniwa canal, and burned the temporary shrine to the ground. A second plague was then reported, which the Soga interpreted as the Buddha's anger at the desecration. The Buddha image was retrieved and re-enshrined. The dispute thus had no resolution at the level of religious-causal argument; it became a political struggle about which clan would control the new institutional infrastructure that Buddhism implied.

The court war

The Soga-Mononobe contest was not only theological. Buddhism's adoption was understood by both sides as inseparable from continental-style state administration: written records, codified law, a centralized treasury, formal court ceremony, the architectural and ritual apparatus of an empire-modeled state. Whichever clan controlled the religious establishment would also control the bureaucratic establishment. The Mononobe and Nakatomi positions were not religious traditionalism in some pure form; they were a defense of the existing decentralized power structure in which the Mononobe held military authority and the Nakatomi held ritual authority by hereditary right.

The contest played out across thirty-five years. Each new Yamato succession — Bidatsu (572), Yōmei (585), Sushun (587) — became an occasion for renewed conflict over the Buddhist question. The Soga supported royal candidates favorable to the religion; the Mononobe supported candidates favorable to its suppression. Murders were committed on both sides. In 585, Soga no Umako fell ill and made a vow that if he recovered he would build a Buddhist pagoda; he recovered, built the pagoda, and the Mononobe immediately ordered it destroyed. In 587, Soga no Umako organized a full-scale military campaign against the Mononobe.

The Battle of Mt. Shigi, fought in the seventh month of 587, was a decisive engagement. Mononobe no Moriya, the head of the clan, fought from a tree-house position in his estate's defensive works at Mt. Shigi (in modern Nara prefecture). The Soga forces — including the young Prince Umayado, who would later be venerated as Shōtoku Taishi — attacked. Moriya was killed by an arrow. The Mononobe clan was effectively destroyed as a political and military force; surviving members were absorbed into the Soga sphere or driven into obscurity. Buddhism's institutional establishment in Japan dates from this battle.⁶

The Mononobe were not the only losers. The campaign included a number of named killings — minor chieftains, retainers, members of the Mononobe extended household — and an unspecified but substantial number of soldiers on both sides. The Nihon Shoki preserves the names of the principal Soga and Mononobe combatants; the rest are anonymous. The court war that established Buddhism cost the lives of at least one major clan-head and the institutional destruction of one of the four highest-ranking clans of pre-Buddhist Yamato. By the standards of subsequent religious wars, this is a small bill. By the standards of pre-Buddhist Yamato politics, it was the largest single intra-clan military action of the sixth century.

What Buddhism brought

The transmission's consequences then accelerated. Soga no Umako, with Empress Suiko (r. 593–628) on the throne and Prince Shōtoku as her regent, used the next decades to remake the Yamato state along continental lines.

Shōtoku's Seventeen-Article Constitution of 604 — partly a translation project, drawing on Confucian and Buddhist political philosophy — explicitly named Buddhism the sustenance of right governance. "Sincerely revere the Three Treasures" (the Buddha, the Dharma, and the Sangha), reads Article Two; "the Three Treasures are the final refuge of the four generated beings." The constitution was not a constitution in the modern sense — it was a set of moral and administrative injunctions for the conduct of officials — but it codified Buddhism as the religious foundation of the Yamato state.⁷

The court began sending official missions to Sui and then Tang China — the kentōshi missions, beginning in 600 CE and continuing through the eighth century — that returned with sutras, monks, and a model of state Buddhism that would shape the next two centuries. Hōryū-ji was founded near Asuka in 607 CE; within a generation Tori Busshi, son of a Korean immigrant family of bronze-casting specialists, had cast the Shaka Triad of Hōryū-ji's main hall (623 CE), still in place today and counted among the finest early East Asian Buddhist sculptures. The Asuka period saw the founding of the great Buddhist monastic establishments — Asuka-dera, Yakushi-ji, the predecessor of Tōdai-ji — that would become the institutional backbone of the Nara state.

By 752 CE, the dedication ceremony for the Great Buddha at Tōdai-ji in Nara — a fifteen-meter bronze figure that had taken most of the imperial treasury and an estimated 2.6 million laborer-days to complete — was the high-water mark of state-sponsored Buddhist construction. The eye-opening ceremony was attended by representatives from across the Buddhist world, including monks from Tang China, the Korean kingdoms, and (through the Indian monk Bodhisena) the Indian subcontinent.⁸ The transmission of Buddhism from Indic origins via Han China via the Korean kingdoms to Yamato Japan was, in this ceremony, ritually completed.

What the Yamato received with Buddhism was, ultimately, the institutional infrastructure of a continental state. Buddhist monasteries became the country's largest landowners, the most important charitable institutions, the most important centers of literacy and book production, the largest employers of skilled craftsmen. The Buddhist clergy became the country's literate class — by the eighth century, the writing of all official documents and most literary texts was done by people who had received some Buddhist education. The Buddhist imagination became the framework of Japanese aesthetics, ethics, and political theory; Japanese poetry of the Heian period (794–1185) is unintelligible without Buddhist categories, and the great novel of Heian Japan, Murasaki Shikibu's Tale of Genji (c. 1010), is structured around Buddhist motifs of impermanence and karmic retribution.

What Buddhism replaced

Kami worship survived the transmission, but it was reorganized. The local hereditary priestly clans continued to officiate at kami sites; the seasonal festivals continued. But Buddhism's metaphysical framework was so much more elaborate than indigenous kami worship that, by the Heian period, Japanese religious thought had developed a synthesis in which the kami were understood as local manifestations of underlying Buddhist principles. The doctrine that codified this synthesis is honji suijaku — "original ground, manifest traces" — which read each Japanese kami as a suijaku (manifest trace) of a honji (original Buddha or bodhisattva). Amaterasu, the sun-goddess and mythical ancestor of the Yamato royal house, was identified as a manifestation of the cosmic Buddha Mahāvairocana. The local mountain kami at Tōnomine became the trace of the bodhisattva Maitreya. The synthesis was generous on the surface and subordinating in structure: the kami were preserved by being read as Buddhist phenomena.⁹

This synthesis ran for nearly a thousand years until the Meiji government in 1868 ordered the shinbutsu bunri — the formal separation of kami worship and Buddhism — as part of its program of imperial nationalist re-foundation. Thousands of Buddhist images were removed from kami shrines; Buddhist priests at combined sites were forced out; some shrines were burned. The Meiji haibutsu kishaku ("abolish Buddhism, destroy Śākyamuni") movement of 1868–1872 saw approximately 40,000 Buddhist temples destroyed across Japan, much accumulated material culture lost, and the systematic dismantlement of the honji suijaku synthesis. The destruction is now commonly described in modern Japanese religious historiography as comparable in scale to the Tang Huichang persecution of 845 in China.¹⁰

Both religious traditions were diminished by the separation. Kami worship lost the metaphysical framework Buddhism had supplied; Japanese Buddhism lost the popular village-level engagement that had been mediated through combined kami-Buddha sites. Modern Shinto is, in important respects, a nineteenth-century invention reconstructed from the materials Meiji nationalism wanted to recover.

The continuing cost: Japanese Buddhist warfare

The most striking feature of Japanese Buddhist institutional history, considered against the doctrine that Japanese Buddhism actually preached, is how much sustained military violence the religion's institutional life produced.

By the Heian period, the great Buddhist monasteries of Mt. Hiei (Enryaku-ji), Kōfuku-ji at Nara, Tōdai-ji, and the Negoro-ji complex south of Kyoto had begun to maintain their own armed forces — the sōhei, warrior-monks, recruited from the monasteries' own dependents and trained for armed defense of monastic interests. The sōhei armies grew across the Heian and Kamakura periods to become a permanent feature of Japanese politics. Mt. Hiei's sōhei could field forces of several thousand and routinely intervened in Kyoto politics, marching down to the capital with the portable shrine of the mountain kami (the mikoshi) at their head as a religious threat.¹¹

The Onin War (1467–1477) was, in part, a religious civil war. The conflict that destroyed central Kyoto and inaugurated the Sengoku period of regional warring states ran on multiple axes — succession disputes among the Ashikaga shogunate, factional conflict among the great daimyō clans — but Buddhist sectarian alliances structured significant parts of it. The Tendai establishment at Mt. Hiei, the Pure Land sects (Jōdo and Jōdo Shinshū), the Hokke (Nichiren) sects, and the Shingon establishments at Kōya-san and elsewhere had different patron clan alignments and fought, sometimes directly, on opposite sides of the conflict.¹²

The Ikkō-ikki uprisings of the late fifteenth and sixteenth centuries are the most dramatic case. Jōdo Shinshū ("True Pure Land") Buddhism, as taught by Rennyo (1415–1499) and his successors at the Hongan-ji temple in Kyoto, mobilized rural peasant communities into self-governing leagues that controlled large portions of the countryside in central and eastern Japan from the 1470s through the 1580s. The Ikkō-ikki defended themselves militarily against samurai authority, periodically governed entire provinces (Kaga from 1488 to 1580), and defeated multiple shogunate-aligned armies in pitched battle. Their suppression took the combined armies of Oda Nobunaga and Toyotomi Hideyoshi from the late 1560s through the 1580s.

Nobunaga's destruction of Mt. Hiei in 1571 is the largest single act of Buddhist suppression in Japanese history. Ostensibly to break the Tendai establishment's political power and strategic position, Nobunaga's army surrounded the mountain, burned every building, and killed everyone on it — monks, novices, women, children, dependents. Modern estimates of the death toll range from a few thousand to over twenty thousand. The figure is uncertain but the order of magnitude is supported by Jesuit observers (Luís Fróis among others) who reported the destruction.¹³

The destruction of the Nagashima Ikkō-ikki strongholds (1574) and the Echizen Ikkō-ikki (1575–1576) followed similar patterns: surrounded fortified populations, refusal of surrender, comprehensive massacre. Nobunaga's letter to a regional retainer about Echizen describes the campaign with explicit pride at the scale of killing. The Hideyoshi suppression of the Negoro-ji complex (1585) and the final reduction of the Hongan-ji at Ishiyama (1580 — eleven-year siege ending in negotiated surrender) completed the destruction of Buddhist military power in Japan.

These campaigns killed an estimated several tens of thousands of Buddhist clergy and lay adherents over fifteen years. They were conducted by warlords who themselves used Buddhist symbolism, claimed Buddhist legitimation, and were buried in Buddhist temples. The doctrine of nonviolence was, in this period of Japanese history, neither held by the perpetrators nor adequately defended by the targets — most of the Buddhist sectarian armies fought back as long as they could.

What the cost was

The transmission of Buddhism from the Baekje court to the Yamato court in the sixth century CE is, in its act of transmission, peaceful: a diplomatic gift with strings. The court war that followed was, in absolute terms, modest — a single major battle, one clan destroyed, one named noble killed. The Mononobe and Nakatomi positions were not unreasonable; they were arguing for the integrity of an existing religious-political settlement that the Soga were proposing to overturn. They lost the argument by losing a battle, which is how religious-political settlements were resolved at the time and place.

The broader institutional cost of Japanese Buddhism is harder to net out. The religion brought to Japan, over six centuries, the architectural tradition that produced Hōryū-ji, Tōdai-ji, and Kiyomizu-dera. The sculptural tradition of Tori Busshi, Unkei, and Kaikei. The literary tradition that runs from the Nara-era anthologies through Tale of Genji through medieval gozan bungaku through modern Japanese fiction. The contemplative tradition that produced Zen in the thirteenth century and travels back westward in the twentieth. None of this would exist on the Japanese archipelago without King Seong's gift.

But the religion that preached ahiṃsā — non-harm — became, in its Japanese institutional life, a participant in centuries of armed faction-fighting. The sōhei warrior-monks. The Onin War's religious sectarian dimensions. The Ikkō-ikki uprisings and their bloody suppression by Nobunaga and Hideyoshi. The Mt. Hiei massacre of 1571. The Meiji haibutsu kishaku of the late nineteenth century, which destroyed approximately forty thousand Buddhist establishments at the founding of the modern Japanese nation-state. The total death toll across this institutional history runs to many tens of thousands of Buddhist clergy and adherents — and as many or more of those they fought, on the receiving end of sōhei armies and Ikkō-ikki uprisings.

The atlas's editorial position requires holding two truths together. The Baekje gift to Yamato was an enrichment of the Japanese cultural inheritance on a scale few transmissions in this atlas match. The institutional life that gift produced was, repeatedly across a thousand years, soaked in violence done to and done by the religion's own personnel. Both facts are part of the record. The sōhei warrior-monks of Mt. Hiei were as Japanese-Buddhist as the monks of Hōryū-ji who chant the Hannya Shingyō every morning today. The same religion produced both.