Sui Empire

The whole of the Northern Zhou

Drafted from Parker, A Thousand Years of the Tartars (1895)formation

The man who reunited China in 589, after three and a half centuries in which no government had held both the north and the south at once, took the throne by exterminating the entire ruling family of the state he served.

The pattern he inherited

By the 570s northern China had been fought over by successor states of the Xianbei conquest dynasties for two hundred and fifty years, in a sequence Parker lays out with the flat brutality of the sources he is translating. The Northern Qi emperor massacred the whole of the Tuoba royal house — seven hundred and twenty-one people, all but one — and it is, Parker suggests, from this barbarous example that the custom of rooting out the heirs of each dethroned dynasty took hold of the Chinese political imagination. In 577 the Northern Zhou emperor captured his rival's capital and in turn massacred that whole family stock.

The founder of the Sui dynasty once more butchered the whole of the Northern Zhou ruling race, and thus ends what may be called the first act in the drama of Tungusic Tartar rule in China.

Yang Jian was a general and regent of mixed Chinese and Xianbei descent, related to the Northern Zhou imperial house by marriage, who used his position as regent for a child emperor to remove every possible rival claimant from that family before taking the throne himself in 581. The killing was not incidental to the succession. It was the succession.

What eight years bought

By 589 Yang Jian's new Sui dynasty had conquered the last of the southern courts, the Chen, ending three hundred and sixty years of division between a north ruled by conquest dynasties from the steppe and a south ruled by a sequence of short-lived native regimes descended from the fall of the Han.

No government had held both halves of China since 316. An entire cultural memory — legal codes, administrative practice, even coinage and weights — had diverged across the Yangtze for longer than the interval between the Norman Conquest and the sixteenth century. Sui's reunification was not a restoration of a system still functioning in living memory. It was closer to what a sixteenth-century European monarch would have faced trying to rejoin polities that had gone their separate ways since late antiquity.

Why the killing was the whole method

Every dynasty that took power on this frontier in this period faced the same question: what happens to the family whose throne you have just climbed onto. Sui's answer, inherited from the two dynasties before it and applied with the same thoroughness, was that the answer is nothing survives.

That method built a state fast — Yang Jian faced no dynastic rival with a plausible restoration claim for the whole of his reign — and it set the pattern his own son would apply to him in turn a generation later, and that a general named Li Yuan would apply to the Sui when its own turn came. A dynasty founded on the principle that a defeated ruling house must be extinguished entirely has, by its own logic, told its successor exactly what to do when its own moment arrives.

The canal

Drafted from (ed.), The Cambridge History of China, Volume 3: Sui and T'ang China, 589-906, Part 1 (1979)expansion

Sui reunited a country whose two halves had grown two different economies for three centuries, and then spent a generation building the single piece of infrastructure that would let them function as one.

Two economies

The north was the old political centre — the Wei and Yellow River plains, wheat and millet country, close to the steppe frontier and its garrisons. The south, under the sequence of dynasties that had held it since the Han collapse, had become the empire's richest agricultural region: the Yangtze delta's rice paddies produced surpluses the dry-farming north could not match.

A reunited China needed to move that southern surplus north, to feed the capital and the frontier armies, at a scale and reliability no existing road network could support.

What was built

The Sui did not dig one canal so much as connect and rebuild a series of older, disconnected waterways into a single system linking the Yangtze to the Yellow River and on to the region of modern Beijing — a corridor of well over a thousand miles, engineered with locks, towpaths and, along the imperial sections, roads planted with willows for the court's own barges.

The labour came from the same conscripted, corvée-obligated population every dynasty in this history drew on for its great works, mobilised on a scale the sources describe in the millions across the whole construction programme — figures that, as with every large corvée project in this history, cannot be verified precisely but that contemporary and near-contemporary accounts agree were enormous and that the ordinary population experienced as catastrophic.

Alongside the canal, Sui built and stocked granaries on a scale historians have called genuinely startling for the period: state granaries positioned along the new waterway and at the capital, holding reserves that — by later Tang accounts — were still being drawn down decades after the dynasty that built them had fallen.

What it did for the state, briefly

For about two decades, it worked exactly as intended. Grain moved north reliably. The reunified administration could actually provision itself as one government rather than as two economies loosely governed from the same throne. The equal-field land allocation system, inherited and extended from the northern dynasties that preceded Sui, gave the state a registered, taxable peasantry to draw both the grain and the labour from.

Why it is the single fact that explains the dynasty

Every later verdict on Sui — that it built brilliantly and governed briefly, that it left China the infrastructure of the next thousand years and did not survive to use it — is really a verdict on this one project, repeated at different scales.

The canal outlived the dynasty that dug it by well over a thousand years and carried Tang, Song and Ming grain shipments long after Sui itself was a cautionary tale. But building it, on top of the other corvée obligations the state was simultaneously imposing, consumed the same conscripted population the dynasty would need for the campaigns that ultimately broke it. A state that can conscript a population once, on this scale, for a genuinely transformative work has shown exactly what it can do to that population again — and the temptation to do so a second and third time, on a project that did not work, is what breaks the dynasty in the end.

On his knees

Drafted from Parker, A Thousand Years of the Tartars (1895)peak

The Sui's most successful foreign policy cost nothing in soldiers and worked by giving a Turkic khan a Chinese princess, a great deal of silk, and just enough jealousy of his own brother to keep the largest steppe power in Asia from ever uniting against China again.

The empire on the frontier

The First Turkic Khaganate, when Sui took the throne in 581, ran from the Manchurian forest to the borders of Persia — the single largest nomad power that had faced a Chinese state since the Xiongnu. Its khan Shapolo styled himself, in Parker's translation of the full title, the Sheporo Baga Khakhan of the Ili-külü horde of Great Turkey, and asserted, formally, an equality with the Chinese emperor: two suns could not share the sky, but Turkey and China could each have one.

When Sui displaced the Northern Zhou, ten thousand Turks who had been living well off a marriage alliance with the old dynasty found their unprofitable arrangement cancelled, and the Zhou princess who had married the khan Tapar began raiding the frontier to avenge her family. The new Sui emperor answered with an army that put Shapolo to flight — and then, having demonstrated that raiding had a cost, spent the following three decades demonstrating that cooperation had a much larger reward.

The method

Sow dissension by exciting jealousies is Parker's own summary of the policy, and the historical record he translates shows it applied with real patience.

When Shapolo's successor Duli felt slighted by favours shown to a rival branch of the family, Sui built him a city inside the frontier, granted him the Ordos country to settle in, and had a large canal dug at forced labour to mark out his new territory. When Duli's own son and successor, the Sibir khan, grew powerful enough to be dangerous, the same offer of a princess and a separate title went to one of Sibir's own brothers — engineering exactly the family rivalry that had worked before.

The boat

The high point of the relationship is a single scene Parker preserves in detail. In 607 the second Sui emperor — Yang Di, whom Parker elsewhere calls, without much ceremony, the celebrated madman — travelled by boat to Duli's encampment in person. Duli received him on his knees, pledging the emperor in a goblet of wine. The following year a second audience was granted, more magnificent than the first.

The Sui court gave the Turkic khan honours above every grandee of the Chinese empire itself: audience without the usual prostration, permitted to keep his shoes and his sword in the emperor's presence, exempted even from the taboo against speaking his own personal name aloud. Two hundred thousand pieces of silk were distributed to two thousand five hundred assembled tribal chiefs in a single ceremony.

That is not the behaviour of an empire treating a steppe power as a subject. It is an empire buying, at a price that dwarfed any single military campaign, the one thing no army could guarantee: an undivided Turkic khaganate that chose, consistently, to stay on China's side of every quarrel it had with itself.

What the policy actually was

Not friendship and not conquest. A permanent, expensive, deliberately maintained asymmetry: enough silk and enough honour to make loyalty to the Sui more profitable than unity among the Turks themselves, renewed at every succession with a fresh marriage and a fresh title, so that the largest nomad confederation on Sui's border spent its energy on its own succession disputes instead of on the frontier.

It worked for the whole of Sui's short reign. It also meant that when the dynasty finally did collapse under the weight of its own wars in Korea, the Turkic khan it had spent thirty years cultivating was the one power in Asia with both the strength and the standing to become, briefly, the arbiter of who would rule China next.

Three times to Korea

Drafted from (ed.), The Cambridge History of China, Volume 3: Sui and T'ang China, 589-906, Part 1 (1979)contraction

Yang Di inherited a full treasury, a working canal and a pacified northern frontier, and spent all three on a war against a Korean kingdom that never submitted, could not be supplied, and broke the dynasty that fought it.

Why Koguryo

Koguryo controlled the northern Korean peninsula and southern Manchuria, and had maintained a genuine independence through the whole period of Chinese division — recognising Chinese suzerainty in form while making its own alliances, its own wars and its own decisions about tribute. A reunified Chinese empire, having just spent a decade compelling every other regional power on its borders into a recognisably subordinate relationship, regarded an unsubdued Koguryo as an anomaly a properly restored Middle Kingdom could not tolerate.

The scale of the failure

The first campaign, in 612, is usually given as the largest single military force ever assembled by a pre-modern state: over a million combat troops on the Sui's own figures, with a logistics train reckoned at two to three times that number again, moving along the same canal system the dynasty had just spent two decades building.

It failed completely. A Sui army that crossed the Yalu and pressed toward the Koguryo capital was drawn deep into hostile territory, cut off from supply, and destroyed on the retreat; of several hundred thousand men reported to have crossed the river, only a small fraction are said to have made it back.

Yang Di tried again in 613, and the second campaign collapsed not to Koguryo but to a rebellion at home — a general commanding the supply effort revolted rather than continue supporting a war he judged unwinnable, and the emperor had to abandon the field to deal with the revolt. A third campaign in 614 achieved a nominal, face-saving submission and nothing more.

What three campaigns in three years actually cost

Not primarily the dead of the armies, though those were counted in the hundreds of thousands. The cost that broke the dynasty was the demand on the same conscripted population, the same corvée labour and the same canal transport capacity that the Grand Canal project had already drawn on to its limit.

Provisioning an army that size meant grain requisitions and transport levies on top of the canal-construction obligations of the previous decade, falling on a peasantry that had barely had a season's relief between one enormous state project and the next. Desertion from the conscription rolls, revolt against local officials trying to enforce the levies, and outright banditry all spread through the same years as the campaigns themselves, in exactly the regions the canal and the war both drew most heavily on.

The pattern this repeats

A state that can mobilise a population once for a transformative project — as Sui had for the canal — has demonstrated a capacity its rulers then trust too far. Yang Di treated the machinery that had moved rice for the empire's benefit as though it could also move a million soldiers for his own ambition, on top of the first obligation rather than instead of it, three years running, against an enemy that did not need to defeat his armies so much as let his own administration exhaust itself trying to supply them.

Koguryo survived the war. Sui did not survive it by more than four years.

The fugitive empress

Drafted from Parker, A Thousand Years of the Tartars (1895)end

The dynasty that had spent thirty years buying the loyalty of a Turkic khan with princesses and silk ended with a Turkic khan sheltering its own fugitive empress, while the man who would found the next Chinese dynasty asked the same khan for troops.

The attack at the summer palace

By 615 the Sui court's authority had visibly weakened under the strain of the Korea campaigns and the rebellions they had provoked at home. The Turkic khan Sibir, whom Sui's own divide-and-rule policy had spent a generation cultivating and constraining in turn, judged the moment right to reverse the relationship.

In the autumn of 616, while Yang Di was at his summer residence enjoying the cooler weather, Sibir made a sudden attack on the imperial party and very nearly took the emperor prisoner — stopped only by frontier battalions arriving in time. It was, Parker notes with a certain grim symmetry, not so very far from where the first Han emperor had been surrounded by the Xiongnu eight hundred years before.

What Sui's own policy had built

The scale of what Sibir could now do is the measure of how far the divide-and- rule strategy had actually enlarged Turkic power rather than merely managing it. His khaganate now stretched from the lands of the Khitan in the east to his Xianbei kin in the west, commanded — on the figure Parker records — over a million bows, and held the nominal suzerainty of every Chinese aspirant to the throne then emerging from Sui's collapse:

During the anarchy and misery which prevailed towards the close of the Sui dynasty, innumerable Chinese took refuge with Sibir, whose power now began to threaten the very existence of China... every one of the numerous aspirants for the imperial throne faced north and declared themselves his vassals.

Sibir gave asylum to the fugitive Sui empress herself.

The general who asked for help

Among the aspirants was Li Yuan, a Sui general whose own father had married a Turkic noblewoman of the Duku family — a European source, Parker notes, even suggests she may have been Christian, not improbable given a Nestorian mission would reach the Chinese court within a generation of her grandson's own reign.

Li Yuan sent envoys to Sibir asking for assistance, and the khan sent horses and three thousand troopers to help him in his campaign in eastern Gansu. When Sui formally ceased to exist, gifts flowed to Sibir in gratitude; his son and successor Chula received a condolence embassy, a public mourning at the Chinese court, and thirty thousand pieces of silk on his own succession — the same currency of tribute and title Sui itself had spent thirty years distributing, now paid by its successor to the same family.

Chula, for his part, gave the fugitive Sui empress and a surviving Sui prince a welcome at his own court, granted the prince rank, and placed ten thousand Chinese refugees under his nominal authority — a shadow Sui administration, complete with its own officials, operating inside the Turkic khaganate and dating its own documents by the reign years of an emperor who no longer had a country.

What it means that both sides needed the same ally

Sui had built its Turkic policy to keep a united khaganate from ever threatening China. In its final years, that same khaganate became the single most decisive factor in who would actually inherit China — sheltering the fallen dynasty's family with one hand and arming its replacement with the other, because thirty years of Sui gifts and titles had made every Chinese claimant understand exactly whose recognition was worth having.

Li Yuan founded the Tang within two years of Sibir's attack on the Sui emperor. His son would spend the following decade finishing what that alliance had started, and would eventually turn on the very Turkic power that had made his family's rise possible — the debt collected in full, and then reversed.

Thirty-seven years

Drafted from (ed.), The Cambridge History of China, Volume 3: Sui and T'ang China, 589-906, Part 1 (1979)afterlife

Sui lasted thirty-seven years, from reunification to collapse, and almost everything about the three centuries that followed it was decided by what it built and what it broke in that short span.

What Tang kept whole

The canal system stayed, and remained the empire's principal artery for moving southern grain north for the rest of the imperial period — Tang, Song and even Ming administrations maintained, redug and depended on a waterway Sui's conscripted labour had dug. The granary system Sui had built and stocked was still being drawn on by the Tang court decades into the new dynasty; a state that fell in crisis had, in its more competent years, stored a genuine surplus.

The equal-field land distribution and the administrative structure of prefectures and counties, the examination system in its early form, the legal code — all of it passed to Tang with only the modification a new dynasty applies to make a system visibly its own rather than a wholesale replacement. Li Yuan and his son did not reinvent Chinese government. They took over Sui's, corrected what had broken it, and ran the corrected version for the better part of three centuries.

What Tang corrected

Almost every specific failure. The Korea campaigns were abandoned as a fixed policy goal — Tang would eventually subdue Koguryo, but as one campaign among many rather than as the obsessive, repeated, self-defeating effort that had broken Sui, and only after building alliances that let somebody else do much of the fighting. The corvée burden was managed with more attention to what a population recovering from thirty years of continuous mobilisation could actually sustain. The Turkic policy that Sui had built on titles and princesses was, within a decade of Tang's founding, replaced by outright conquest: Tang Taizong destroyed the Eastern Turkic Khaganate that Sibir had built, and took for himself the title Heavenly Khan — sovereign of the Chinese and of the steppe at once, a status Sui had spent thirty years paying for and Tang simply took.

The verdict Tang built its own legitimacy on

Sui's fall became, within a generation, the standard historical example Tang court advisers used whenever they wanted to warn an emperor against exactly the kind of overreach that had destroyed his dynasty's own predecessor. Wei Zheng, the Tang minister famous for blunt remonstrance, invoked the Sui repeatedly and explicitly as the cautionary case for excessive construction projects, foreign campaigns and the exhaustion of the peasantry — using the same rhetorical move Han had made about Qin eight centuries earlier, because it was, by the ninth century of the pattern, a well-tested argument: legitimacy survives the machinery of empire only if the machinery is not run to destruction.

The short dynasty that built the long one

Measured only by its own duration, Sui belongs beside Qin as one of the shortest-lived unifications in Chinese history — fifteen years for one, thirty- seven for the other, each ended by the exhaustion of a population its own administrative brilliance had over-mobilised.

Measured by what it left standing, Sui is closer to being the actual founder of medieval China than the dynasty that gets the credit for the three centuries that followed. The canal, the granaries, the reunified administration, even the lesson in what not to do with a million conscripted men — Tang inherited all of it, the same way Han had inherited Qin's roads and registers within a few years of burying the state that built them, and then built the version of it that lasted.