The Xiongnu

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A man who would be ruler of the steppe killed his father to take the title. In 209 BCE Modu, heir to the chanyu Touman, turned a corps of trained horse-archers — drilled to loose their arrows wherever his own whistling arrow flew — first on his father’s favorite horse, then on his own wife, then on the chanyu himself. The horsemen who had shot the first two targets at his command did not hesitate at the third. With that act, recorded by the Han historian Sima Qian in the great account that opens the documentary history of the eastern steppe, the loose tribes of the Mongolian grasslands were welded into a single command. The polity Modu built was the first of its kind: a mounted confederation that for three centuries treated the largest sedentary empire on earth as a near-equal, an enemy, and a paymaster by turns.

The Xiongnu were a confederation before they were an empire, and the distinction governs everything about them. There was no city to besiege, no single field whose loss would end a campaign, no harvest a marching army could burn. Their wealth walked — herds of horses, sheep, cattle, and camels driven between seasonal pastures across the high cold grassland north of the Gobi — and their fighting strength was the same population mounted. The bow drawn from horseback, the false retreat, the sudden concentration of cavalry at a chosen point and its equally sudden dispersal: these were not tactics learned for war but the year-round economy of the herd turned outward. What Modu added to this was politics. He bound the chiefs of dozens of peoples into a hierarchy with himself at its apex, and he made the apex sacred.

The chanyu and the order of the steppe

The supreme ruler bore a title the Chinese transcribed as chanyu (also read shanyu), and the ruling house was the Luandi clan, which by custom took its principal wives from a small set of allied aristocratic lineages — the Huyan, the Lan, the Xubu — so that the marriage politics of a handful of families ran the confederation. Beneath the chanyu the realm was cut in two along the rising and setting sun. The Left, the east, was the senior half and the seat of the heir apparent; the Right, the west, faced the lands toward the Yuezhi and the oases. Each wing was headed by a Worthy King — the Chinese rendered the office Tuqi, worthy or wise — and below them a descending order of kings, commandants, and chiefs of households, organized on the decimal pattern that recurs across the later steppe: commanders nominally of ten thousand horsemen, then of thousands, hundreds, and tens. The numbers were notional more than exact, but the principle was real: a structure that could mobilize the whole male population in graded units and dissolve it back into the herding round when the campaign ended.

This was a state, but a state without the apparatus the sedentary world used to recognize one. It kept no archive of its own that has survived; almost everything written about the Xiongnu in their own age was written by their enemies, in Chinese, and the names of their offices and gods reach the historian only in Chinese transcription. The confederation taxed not its own people in grain — there was little grain — but the settled world at its edge, through tribute extracted by treaty and through the plunder and trade that ran along the same frontier. Its cohesion depended on the chanyu’s ability to deliver both war and the goods of peace; a chanyu who could neither raid successfully nor command the silk and grain of the Han lost the loyalty of the wings. The empire was, in this sense, perpetually staked on its relationship with China.

Tengri and the sacred sky

What made the chanyu more than the strongest chief was the sky. The high god of the Xiongnu was Heaven itself — the Chinese sources call it Chengli, a transcription of the steppe word that later Turkic and Mongol peoples would speak as Tengri, the boundless blue sky raised to a deity. The chanyu’s full ceremonial style, as the Book of Han preserves and glosses it, was Chengli Gutu Chanyu: Chengli the Heaven, Gutu the son, chanyu the vast — the vast son of Heaven. The steppe had its own Son of Heaven, and the title is not a borrowing from the Chinese Tianzi but its mirror across the wall, each empire claiming the same warrant from the same sky and refusing it to the other.

The cult was the religion of rule. At dawn the chanyu left his tent and bowed to the rising sun; in the evening he bowed to the moon. Three times a year the great men of the confederation gathered, and the chief assembly convened at a place the Chinese named Longcheng, the Dragon City — not a city in the walled sense but a sanctioned ground, in the Orhon river country at the heart of the Mongolian steppe, where the chanyu offered sacrifice to Heaven, to Earth, and to the ancestors and spirits, and where the people and the herds were counted. White horses were killed and oaths sealed in blood. Days were reckoned in a cycle of ten, and the days marked wu and ji were held the most auspicious for action — a detail Sima Qian thought worth setting down, and a reminder that the steppe read the calendar for omens as carefully as the Han court read its own. Around the chanyu moved diviners and ritual specialists whose readings could shape the timing of a march; the world was legible to them as it was to the diviners of every neighboring tradition, and the reading of the heavens for the fortune of the ruler was as native to the felt tent as to the observatory at the Han capital.

To narrate this is not to file the Xiongnu under a later named creed. The sky-religion of the steppe took named and codified form only centuries afterward, among the Türk and Uyghur and Mongol successors who left their own inscriptions; what the Xiongnu kept of it survives in fragments seen through Chinese eyes, and through the goods buried with their dead. The cult belongs, all the same, to the same broad steppe inheritance that later carried the Religion of Light eastward across the same grasslands and that stood, far to the west on the Iranian plateau, in the world the worship of the sky and the sacred fire shaped under Zoroaster. Heaven over the felt tent and Heaven over the imperial altar at Chang’an were not the same Heaven, and each empire knew it; the long quarrel between them was, among other things, a quarrel between two claims on the sky.

The duel with the Han

Modu’s confederation rose precisely as China was being unified by force from within, and the two events are bound together. The short, ferocious Qin that first welded the warring Chinese states into one empire had already turned its strength northward: around 215 BCE the general Meng Tian drove the Xiongnu out of the Ordos, the great loop of the Yellow River, and linked the older defensive walls of the northern states — Qin, Zhao, and Yan — into a single long rampart, the ancestor of what later ages would call the Great Wall. The wall was raised against horsemen who could not yet be named as one power; by the time the Qin collapsed and the Han dynasty inherited its unification, the horsemen had become one power, and the most dangerous on earth.

The reckoning came early. In 200 BCE the Han founder, the commoner-emperor Gaozu who had destroyed the Qin and beaten his rivals, marched north against the Xiongnu and was lured into a trap. Near Pingcheng, on the heights of Mount Baideng, Modu’s cavalry — by the historians’ account drawn up in four wings of horses matched by color — surrounded the emperor and the vanguard for seven days, cutting them from the main army in the bitter cold. Gaozu escaped, by a stratagem the sources only half explain, but the lesson held: the empire that had just conquered all of China could not conquer the steppe. From it came the policy the Chinese called heqin, peace through kinship. By the treaty settled around 198 BCE the Han sent a princess of the imperial house to the chanyu’s tent and, with her, fixed annual gifts of silk, grain, wine, and gold; the wall was acknowledged as the boundary between two realms, and the chanyu was addressed, in effect, as a brother sovereign. For roughly sixty years the richest agrarian empire of the age paid the steppe to keep the peace, and called the payment a marriage.

The accommodation held until an emperor decided the cost was intolerable. Under Emperor Wu, whose long reign filled much of the second century BCE, the Han turned from tribute to war. An attempt to ambush the chanyu’s army at Mayi in 133 BCE failed when the chanyu sensed the trap and withdrew, and with it the heqin compact broke for good. There followed a generation of campaigns into the steppe that strained the empire to its foundations. The generals Wei Qing and his nephew Huo Qubing led great mounted columns north between 127 and 119 BCE; Wei Qing retook the Ordos in 127, and in 119 BCE, at the Battle of Mobei — the name means north of the desert — the two armies struck across the Gobi itself and broke the chanyu’s main force, driving the Xiongnu court beyond the desert and out of the lands south of it. The victories were real and ruinously expensive: they emptied the Han treasury, consumed the state’s horses, and forced the fiscal experiments — state monopolies on salt and iron, debased coinage, war taxes — that mark the reign of Wu as the moment the Han state grew teeth. The frontier that had been a wall to hide behind became a base to march from, and the long Han push west along the Hexi corridor, which opened the road to the oasis kingdoms and to Central Asia, was in its origin a flanking movement against the Xiongnu — an attempt to cut the confederation off from its western subjects and allies.

Fragmentation

A confederation that lived by the chanyu’s success could be split by his failure, and the Han learned to split it. War gave way to a subtler pressure: the empire courted dissident kings, played claimants against one another, and dangled the goods of submission. In the middle of the first century BCE the order built by Modu fractured in a succession war, and in 53 BCE the chanyu Huhanye, defeated by a rival, came south and submitted to the Han, traveling to the capital at Chang’an to do homage — the first chanyu to bend to a Chinese emperor, and the beginning of a client relationship that the Han prized as proof of Heaven’s favor.

The deeper rupture came a century later. Around 48 CE the confederation broke in two for good. A southern bloc of tribes set up Bi, a grandson of the elder Huhanye, as their own chanyu in defiance of the reigning northern one, and led their people south to submit to the restored Han under Emperor Guangwu; settled inside the frontier in the Ordos region, they became the Southern Xiongnu, frontier auxiliaries and subjects of the empire they had once dominated. The Northern Xiongnu kept the open steppe and the independence, but the steppe was no longer theirs alone. In 87 CE the rising Xianbei — a people descended in part from those very Donghu whom Modu had shattered nearly three centuries before — defeated the northern chanyu, and a plague of locusts broke what the Xianbei had not. The Han struck the wounded power: at the Battle of Ikh Bayan in 89 CE, and again in a final campaign in 91 CE, Han armies and their allies drove the northern chanyu from his last grounds, and he vanished westward out of the Chinese record. The grasslands that the Xiongnu had ruled passed to the Xianbei, who would in time press on the Chinese frontier in their turn.

The southern remnant lived on inside China’s borders for two more centuries as a settled, half-sinicized people, and in the upheavals that followed the fall of the Han their leaders would re-enter Chinese history as founders of short-lived dynasties in the north — a sequence that belongs to the long story of the frontier rather than to the confederation itself. The confederation, as Modu had made it — a single command over the whole eastern steppe, its ruler the sky’s own son — had lasted from the late third century BCE to the late first century CE, and it did not come again until the Türk and, after them, the Mongols built empires on the same ground.

A note on the European Huns

A persistent question hangs over the Xiongnu’s western edge. When the northern chanyu rode out of the Chinese record in the late first century CE, did the Xiongnu — or some fraction of them, or merely their name — drift west across the inner Asian steppe and resurface, three centuries later, as the Huns who broke upon the Roman world? The equation was first proposed by the French orientalist Joseph de Guignes in the 1750s and has been argued over ever since. Otto Maenchen-Helfen, in the twentieth century’s most exacting study of the Huns, marshaled the linguistic and archaeological evidence against any straightforward identity; later scholars, among them Étienne de la Vaissière, have revived the case for a continuity of name and political prestige rather than of population. No consensus has formed, and the documentary chain that would settle it is missing for the very centuries it would have to cross. The Xiongnu of the eastern steppe and the Huns of the Danube are, for now, two attested powers with a contested thread strung between them — a thread this account names without pulling tight.

The textual and archaeological record

The Xiongnu are known first through the brush of their adversaries. The foundational source is the “Account of the Xiongnu” that forms chapter 110 of the Shiji, the Records of the Grand Historian compiled by Sima Qian under Emperor Wu — the same historian and court astrologer whose work set the form of every later Chinese dynastic history. To it the Hanshu (Book of Han) of Ban Gu and the later Hou Hanshu add the institutional detail, the glosses on Xiongnu titles, and the record of the heqin treaties and the wars. These are partisan documents, written by the literate enemy, and the modern reconstruction of the Xiongnu turns on reading them critically against what the steppe itself has yielded.

For a people who built no cities, the Xiongnu left a dense archaeological signature in the ground. The aristocratic terrace tombs of Mongolia and southern Siberia — Noin-Ula (Noyon Uul), first opened by Pyotr Kozlov in 1924–25 and including the burial of a chanyu who died in 13 CE; the great cemeteries of Gol Mod and Gol Mod II; Takhiltyn Khotgor and Duurlig Nars — have produced Chinese silks and lacquers, imported textiles carrying Hellenistic and Iranian motifs, gold and turquoise harness fittings, and the bones from which stable-isotope and ancient- DNA studies now reconstruct what the Xiongnu ate and where they came from. The picture the excavations build is of a confederation far more cosmopolitan, hierarchical, and economically complex than the Chinese caricature of marauding nomads allows.

The modern scholarship rests on the meeting of text and trench. The standard account of the rise of steppe power against China is Nicola Di Cosmo’s Ancient China and Its Enemies: The Rise of Nomadic Power in East Asian History (Cambridge University Press, 2002), which reframed the Xiongnu not as a barbarian foil to civilization but as a state that the Chinese empire helped call into being. The archaeology is gathered in Ursula Brosseder and Bryan K. Miller’s edited volume Xiongnu Archaeology: Multidisciplinary Perspectives of the First Steppe Empire in Inner Asia (Bonn, 2011), whose survey chapter maps the state of the field. The Iranological and Inner-Asian context, including the long debate over the Huns, is set out in the Encyclopaedia Iranica’s article on the Xiongnu; the Han side of the frontier, its institutions and its frontier garrisons, is covered in the relevant volumes of the Cambridge History of China. Between the historian’s hostile witness and the excavator’s silent one, the first empire of the steppe comes back into view: a power that made the sky its title, the herd its army, and the wall of China its long horizon.

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