Genghis Khan Never Fought a Battle He Thought He Could Lose

Genghis Khan, born around 1162, became conqueror of the largest contiguous empire in history. Before that he was a boy named Temujin who, at nine, lost his father, his tribe, and nearly his life on the Mongolian steppe. Lex Fridman asks Jack Weatherford, the anthropologist who has spent decades on this subject, to start with that boy. Weatherford refuses to start at the birth. The story of Genghis Khan, like the story of all of us, he says, begins long before.

One day a cart was moving across Mongol territory. Only women drove carts: men rode horses, and women owned the gers, the household gear, and the animals that had to be hauled. A moving cart meant a woman was relocating. This one carried a new bride, Hoelun, with her husband riding beside her. On a hill, a man named Yesugei was hunting with a falcon. *The Secret History of the Mongols* is very clear, Weatherford says. Yesugei glimpsed a young bride, rode back to camp, fetched two brothers, and the three of them came racing down.

Hoelun's husband fled, not from cowardice, Weatherford thinks, but to pull the pursuers after him. He circled back. In that interval she had decided it was more important that he live. "You must flee," she told him. If he stayed they would kill him and take her; if he ran they would still take her, but he could find another wife, name her Hoelun, and remember. He rode away with his braids whipping from chest to back. When he was over the ridge, she began to scream. One of Yesugei's brothers told her that even if she shook the waters out of the river and the mountains with her screaming, she would never see that man again. He was right. Every detail of that kidnapping, Weatherford says, will come back again and again—through Genghis Khan's life, through later feuds, and in some parts of the world still.

The child would be born to a kidnapped woman held by strangers, and Yesugei already had a wife, Sochigel, and a son. The father was not even present at the birth. He was off fighting Tatars, killed a man named Temujin Uge—"person of iron" in Turkic—and came home to a baby he named Temujin after the man he had just slain. A kidnapped second wife, not a legal one, and a name taken from a corpse: Weatherford calls it an inauspicious beginning, and the childhood that followed did not improve.

Once, when Temujin was perhaps four or five, the family moved camp and simply forgot him. Taichiud people found the child, kept him a while, and eventually sent him home. Weatherford says he never detects much spark between father and son. At eight, Yesugei took Temujin off to find a wife—in Mongol custom, that meant leaving the boy with the girl's family to be raised—and did not take Behter, the son of the other wife. He never reached Hoelun's relatives. He stopped at the first household, saw a nine-year-old girl named Borte, and *The Secret History* describes fire in both children's eyes. Yesugei left Temujin there. On the way home he joined a Tatar drinking party, hid his identity, was recognized, and was poisoned. He rode back and died within days.

A family friend named Monglik fetched the boy. They survived the winter. In spring the clan moved camp and held an ancestor ceremony without telling Hoelun. When she arrived angry, the old women said she was the one they did not have to call: they would feed her if she came, but they did not have to take care of her. As a captive, she was not a real wife. They packed up, took her animals, and left. She jumped on the last horse, seized her husband's banner—the *sulde* that holds the soul after death—and raced around the people. They camped one nervous night, then slipped away in the dark, killing a family friend who tried to stop them. Temujin, eight years old, cried. Four or five children, Sochigel, and her two sons were left on the steppe to die when winter came. Hoelun pulled her hat down, took a black stick, and ran the riverbanks digging roots. She saved every child.

Later the Taichiud recaptured Temujin and locked him in a kang, a wooden yoke that trapped head and hands, like an ox. Each night a different ger guarded him. During a drinking celebration he was left with a boy who was not very smart. He swung the kang as a weapon, knocked the boy out, and hid in the river still yoked, breathing as best he could in the dark. A captive family risked sawing the kang off and burning it. Weatherford underlines the legal point: Yesugei's brothers had been obligated, under Mongol custom, to marry Hoelun and raise the children of their brother. They did none of it. Temujin learned very early that you cannot trust family.

Weatherford says Temujin's story was not unique on the twelfth-century steppe. Isolated outcasts simply sat out the winter raids for women, horses, and Chinese trade goods the Mongols could not make themselves. Generation after generation of Temujin's genealogy is full of kidnapped women and uncertain fathers. Once he became Genghis Khan he would outlaw the kidnapping and sale of women, in part because of what happened to his mother—and because of what happened next. At sixteen, Borte, now seventeen, arrived with her mother. For a boy who had suffered every indignity, Weatherford says, here was someone who loved him. It lasted a few months.

Early one morning an old visitor, Granny Kokochin, felt vibrations in the earth and knew horsemen were coming. Mother Hoelun was still in charge. She put her children on horses, took the baby girl Temulin in her lap, and had one extra horse—but she would not take Borte. She did not know who the riders were, only that men coming in the dark were coming for a woman, and this family of outcasts had just acquired a wife. She left Sochigel, the grandmother, and Borte piled into an ox cart. The attackers focused on the cart; Hoelun got her children into the mountains. Temujin had obeyed his mother and lost the most important thing in his life. Weatherford calls this the defining moment. The story began with his mother's kidnapping. Now his wife was taken. He decided that if he had to die getting Borte back, he would die getting her back.

He needed allies. He went to Ong Khan, also called Toghrul, who ruled the Keraite people around today's Ulaanbaatar, because that man had once been lord over Yesugei. The gift was a sable coat Borte's mother had brought for Hoelun. Ong Khan agreed to send troops but told Temujin to call Jamukha as well. Jamukha was about the same age. Their families wintered near each other; both claimed descent from the same kidnapped Uriankhai woman a few generations back, "from the same womb." Both had lost fathers early; Jamukha had lost his mother too and grown up among old wives of his grandfather, with no siblings. On the ice they became *anda*, a bond beyond friendship, swapping roebuck knucklebones, then later whistling arrows. Weatherford describes Mongolian winter ice at fifty below: slide something across it and it runs like silk; put your ear down and you hear a celestial sound, "like the angels are singing under the ice."

Jamukha already talked fiercely. He promised to jump through the *toono*, the smoke hole of the ger, and kill Merkit men, women, and children forever. He dressed down Ong Khan's late troops: Mongols keep their word in rain, sleet, or snow. They hit the Merkit camp by night, under a full moon. Temujin paid little attention to the fighting. He called Borte's name; she heard him, jumped from a cart, and they embraced. "This is the goal," he said. "This is why we are here." It was his first full military engagement. Along the way, Weatherford notes, he had already killed his older half-brother Behter.

The killing of Behter appears only in *The Secret History*. Persian and Chinese chronicles knew nothing of it until that text was deciphered. In Mongol society the older brother has complete authority: younger siblings address him as *ta*, he addresses them as *chi*, and his word is the father's in the father's absence. If brothers do not marry a widow, a son by another wife may do so. Behter, once through puberty, might have married Hoelun. Weatherford does not know whether that happened; he thinks either it did, or Temujin was trying to prevent it. Behter already took fish and birds Temujin caught—perfectly acceptable in the hierarchy. Temujin and his next brother, Qasar, shot Behter with arrows. Sochigel and her younger son Belgutei stayed. The one who raged was Hoelun, in a long tirade that he would have nobody in life except his own shadow. Weatherford does not think the killing was emotionally deep for Temujin. Behter was a problem. He resolved it, young. Belgutei remained loyal for life, and rode on the raid that brought Borte home.

Borte was pregnant. Temujin and Jamukha renewed the anda before the whole clan. Jamukha put a gold belt stolen from the Merkit on Temujin; Temujin gave him a mare that had never foaled, with a little growth on her forehead they called a horn. The belt is the sign of Mongol manhood; a woman was *busgui*, a person without a belt, a word still used. *The Secret History* says they slept apart under the same blanket, happy together. The baby was named Jochi, "visitor"—because he was a Merkit child, some said, or because he was born on Jamukha's land. Jamukha's own ancestor, born to a kidnapped pregnant woman, had been named "foreigner." Much later, when Genghis Khan's sons called that first child a Merkit bastard, he defended Borte viciously. They had not been there. They had not seen the sky turning and the earth turn over. "If I say he is my son, he is my son." If their mother could hear them, her warm womb would turn to cold stone.

Not long after the birth, Borte urged Temujin to break away: Jamukha lorded it over him too much. He loved his wife more than anything and ran all night, taking the baby. Neither man claimed to break the anda. Both stayed loyal to Ong Khan for a time, fighting different campaigns. Temujin won victories that helped Ong Khan earn a Chinese title; then he asked that his son marry Ong Khan's daughter, and Senggum told his father they would not marry those low Mongols. Temujin fled east to Baljuna. Jamukha fought for his lord. Their forces clashed; they did not meet in combat. After defeating Ong Khan, Temujin's people gave him a new title at Black Heart Mountain by the Blue Lake: Genghis Khan, a name no one had held. Mongolians like words with several meanings. It sounds like strength in Mongolian and like *tengiz*, the sea, in Turkic. Weatherford compares it to a later fad for naming girls Michelle: French, American, and "smile" in Mongolian at once.

Jamukha shifted to the Naiman, then deserted them with stories of Mongols with snouts of steel who eat humans alive. He took the old title Gurkhan with few followers. His own people captured him to sell. Genghis Khan rewarded them by killing them all, because they had betrayed their leader, who was still his anda. He asked Jamukha to come back as his shadow and safeguard. Jamukha said he would always be a louse under the collar, a thorn in the lapel. Kill me without shedding blood, he asked, and bury me on a high place; I will guard you and your people forever. Blood holds part of the soul; the honorable death is to be wrapped in felt and beaten or trampled. Weatherford thinks that is how it was done, near Tuva. Jamukha's last accounting: both lost a father, but Temujin had a strong mother and Borte; Jamukha's wife, he said, only prattled. In positive and negative ways, Weatherford calls it the most important adult relationship besides Borte.

Weatherford often wonders what happened to that gold belt. It disappears from the story, and a gold belt does not just disappear. Temujin was never interested in goods. As Genghis Khan he controlled more wealth than anyone, yet he dressed simply, lived in a tent, and said he ate what his soldiers ate, dressed as they dressed, lived as they lived. No one was allowed to write about him, paint him, or make a statue. No palace, tomb, temple, or gravestone. The first portrait was painted in 1278, fifty-one years after his death. The first statue waited until the twenty-first century. Power corrupts easily, Weatherford says, and it is hard to explain how he stuck to this. What mattered were the people around him: his guard, the center of the army, his family, his four wives.

He did order an alphabet for the Mongols, adapted from the Uyghurs, and told his children to learn to read; some did. The only thing he allowed written in his lifetime was the law, in blue books. On every campaign, even the Merkit rescue, he adopted an orphan. Hoelun raised a household of boys from different tribes who became high officials. One Tatar boy, Shigi Qutuqu, was a poor soldier and a superb reader. Genghis Khan made him supreme judge. After the khan died in 1227, Shigi Qutuqu compiled *The Secret History* in 1228, the year of the mouse, at a spot in Mongolia you can still visit. It begins with the marriage of a gray-blue wolf and a tawny deer. Scholars call it totemic; Mongols, Weatherford found, say those were people's names.

The intimacy is why it was secret. Shigi Qutuqu had slept in the same ger; he records Borte sitting up in bed telling her husband what he must and must not do. It was for the family, upholding the ban on putting the family in writing. Scholars began to think it did not exist. In the nineteenth century a Russian academic in Beijing found a manuscript of Chinese characters that made no sense in Chinese. Read aloud, it made sense in Mongolian: a phonetic code. Francis Woodman Cleaves of Harvard translated it in the 1950s; a publisher fight delayed the English until 1982, and the second volume of notes was lost. Ming commentators in the margins tried to explain away Mongol women marrying stepsons, which violated Confucian ethics. Weatherford took the document as his guide, then went to Mongolia to walk the places, because they are named so exactly.

"History does not live in books," he tells Lex. "History lives in the people." He did not know in which season Borte was kidnapped, which mattered for dating everything after. Nomads in that valley said it was obvious: winter. Granny Kokochin was on the ground and felt vibrations. In summer the ground is too soft. A man sitting beside his horse handed Weatherford a piece he had been searching for, and it correlated with other evidence. He had gone first to the Central Asian cities Genghis Khan conquered and learned little. In Mongolia, if the khan came back today, Weatherford says, he would know exactly where he was: no road, no sign, no building, no power line.

Mongolia, Weatherford says, is a world that for the most part is the same as when Genghis Khan was there. That is not true of London, Moscow, or Istanbul. It is one of the largest countries in space, with about 3.3 million people, living intimately in the land. The first impression of the steppe is that you can see forever in every direction, like being at sea. Wind comes down from Siberia and the Arctic, cold but always fresh. Grass smells; when there is no grass there is dust. Mongols define their world by water. Genghis Khan did not give his sons lands to rule. He gave them waters and people. They call the earth *dalai*, ocean. You do not camp on the river, because you would pollute it and because summer flash floods can wipe a camp away. You water the animals and take them back. You bathe away from the river. The rules are still Genghis Khan's.

A line Weatherford wrote, which an editor cut as insulting, said that Mongol and horse know each other with every twitch of muscle, and they smell the same. He meant intimacy: horses know their owner by smell. Battle flags, the *sulde*, were made from the hair of their own horses, so mounts returned to the scent of their herd. He has never mastered all the color words for horses, let alone the rest. Point to one horse, say brown; point to another, say brown; a herder asks what color the second one is, then, if the first was brown. A presidential candidate ran on the slogan "Raised in the dust of many fast horses." People wipe horse sweat and dust onto their own forehead, the most sacred place, where the soul resides. Harming a horse's head is spoken of as a capital crime. Western metal spurs in the belly horrify them.

On a gelding day Weatherford watched an eleven-year-old fall from a horse and not get up. No one moved. The boy's little brother finally helped him hobble in; the mother turned her back. Two weeks later another boy, twelve, practicing for Naadam, was knocked off in the woods, lost for two weeks, and lived. He slept by day, walked by night, sang to keep wolves away, and followed moving water downhill. Weatherford says he himself would have died in forty-eight hours. The mother does not run to the fallen child because she knows he must be able to take care of himself. Lex mentions the wrestler Cary Kolat, who saw Mongolian wrestlers take ice-cold showers without a grimace. Men still strip and roll in the first heavy snow to prepare for winter. In Weatherford's valley, wrestlers pour mountain water over themselves and never get in the river.

Horse, rider, and composite bow were, Weatherford says, the most lethal weapon known before the modern era. Mongols were on horseback from birth; by three they rode alone. In the 1990s, race jockeys had to be under six, some of them three, without saddles, staying on a horse trained to do the work. Each warrior took about five mounts. They shot to defend herds from wolves, foxes, even tigers, and from raiders. Those skills were common to steppe nomads: the Huns came out of Mongolia—*hun* is still the Mongolian word for human—and so did early Turkic groups. The genius Weatherford cannot explain is how Genghis Khan organized that weapon. Attila and various Turkic leaders were charismatic. Genghis Khan's army was small, never much above 100,000, 110,000 at most. Lex notes it would fit in a stadium. Against China's millions, against Russia, Persia, and Afghanistan, the whole army had to be as finely tuned as each rider, bow, and horse.

All cavalry, no infantry, no baggage train, no commissary early on, no engineer corps until much later. The decimal system ran from the *aravt*, a squad of ten, up through hundreds and thousands. The squad leader had total control; the men knew they came back with every member, or the body. Each man carried as many arrows as he could, retrieved his own and the enemy's—an advantage in Russia, where Russians could not use Mongol arrows well, but Mongols could use Russian ones. Every soldier carried needle and thread, to sew a garment, a hide, or a wound. They carried *aaruul*, dried curd that keeps for years; shaken all day in a water flask it becomes thick protein. Mongols could go three to five days without a fire. They moved in left and right wings—east and west in Mongolian—with the khan's guard as the moving center, sometimes a vanguard two years ahead to clear pasture. They never marched in a single-file column. Each horse had its own path, all parallel.

When Shigi Qutuqu lost a rare battle in Afghanistan, Genghis Khan went to the field with him and asked him to explain what he had done. There was no execution for defeat. Retreat saved Mongol lives, and he respected it. Around 1209, after founding the nation in 1206, he met his first walled cities in Tangut country. A man whose walls had been felt looked at moving water and a standing wall: anything that moves is a weapon, anything that does not is a target. He had a channel dug to bring the Yellow River against the wall. The embankments were too low; the Mongol camp flooded. They improved the method and used it for fifty years, through the fall of Baghdad in 1258. Weatherford's contrast is human nature: we say we learn from mistakes and then repeat them. Genghis Khan stayed humble before technologies he did not know, understood them in his own way, and promoted on ability. That combination, iterated in war, built a stronger army for three generations.

Mongols did not fight for honor the way readers imagine Achilles. They fought for victory. There was no shame in retreat. Genghis Khan himself, Weatherford says, never fought a battle he thought he could lose, and he won every battle he fought—unlike every general under him. That ethic became a tactic. A small group attacked, fired forward, then turned and fired backward, the Parthian shot, or leaned under the horse's neck. Opponents broke ranks to chase. If they did not, the Mongols threw out loot. At a chosen point, the main force came from behind two hills and slaughtered them. Over and over it worked. Weatherford keeps asking how people did not know. Lex's answer is human nature: when the other side runs, you want to follow. They also disliked roads, and often arrived from a direction nobody used. At Bukhara they came across the desert. Dust looked like a caravan. The surprise was the direction.

Terror was one of his greatest weapons, and he cultivated it. He forbade writing about himself, but he encouraged refugees. After a city fell he made sure plenty reached the next one, to strain food and to carry tales of steel teeth and child-eating. That was propaganda, mental terrorism. Envoys went first: surrender, and lives are spared, professions continue, taxes usually stay the same but go to the Mongols. With 100,000 soldiers he could not garrison; locals would keep running their cities. He was faithful to that bargain. In northern Persia his son-in-law Toqta looted people who had surrendered. Genghis Khan stripped his rank and sent him into the next city as a common soldier. He was killed there. If a city fought and lost, the Mongols killed the leaders, who had not served their people, and usually the army, which could not be absorbed. They spared every artisan: potters, metalworkers, weavers, translators, anyone who could read.

The worst slaughter, Weatherford says, came after an agreement and then betrayal. The Mongols would move hundreds of miles on; a city would ignore a later request for livestock; he would return and kill everyone. Those cases clustered around Iran and Afghanistan. Only in Afghanistan did emotion sometimes take over. A grandson he loved, who had had the happy childhood Temujin had not, was sent to take the Bamiyan valley. Persian history says the thumb of fate fired the arrow. Genghis Khan had never lost a son or grandson in battle. He summoned the boy's father, made him promise not to cry, and said the son was no more. No one in the Mongol camp was allowed to mourn. "Make them cry." The killing in Afghanistan went on for weeks until he saw that emotion had overcome practicality, and he stopped. Cities that had not revolted were not killed. Cities that revolted after the heir's death were wiped out. It is the only time Weatherford knows him to have lost control.

Estimates put deaths under Genghis Khan and the Mongol Empire around 40 million, about a tenth of the world then, on the order of 800 million scaled to today. Weatherford does not dodge the scale. Millions were killed; for every family that lost someone, it is a total loss. He does not think we should judge the Mongols by a different standard than other conquerors, or than countries that fight wars now, including the United States. People kill children, women, and civilians every day, always in the name of peace, God, or nation. America supplied bombs, invaded Afghanistan, fought in Iraq and Syria, always "defending democracy." He goes back to World War II: atomic bombs on Hiroshima and Nagasaki were not military targets. They terrorized a country by killing women and children. "That's America, that's us." His father fought in that war, in Korea, and in Vietnam. He does not condemn America, he says. He asks how we condemn one set of people and excuse it in ourselves—especially when the targets are "barbarians" from the steppe.

Lex raises Dan Carlin's *Hardcore History* series *Wrath of the Khans* and the idea of historical arsonists: figures whose destruction paves the way for new order. Weatherford is wary of making that a justification. The Mongols unified Korea's kingdoms, put together the China we see today, and shifted Russia's center of gravity. Baghdad's caliphate and the Southern Song were already decayed. He is not a pacifist; he grew up among soldiers. He asks for tolerance of what the Mongols did if we can tolerate what Americans did. Ramifications persist in ways we miss: some Taliban leaders, he notes, come from the Judran clan, descended from Jamukha's people. Saddam Hussein on television called the Americans the new Mongols. Weatherford does not accept the equation, but he sees how people think it.

Carlin respected Weatherford's work and criticized it for stressing positive effects without enough airtime for the hell of the killing. "Guilty," Weatherford says. Carlin is smart, and he is right. That is not what Weatherford wants to stress. He does not deny the warfare; it is much the same everywhere, and he is less interested in how a wall came down than in what came afterwards. A nation of a million people does not rule hundreds of millions by war. You conquer by war; you rule by offering things people want: trade, a postal system, religious freedom, rights of women and minorities. Conquest was twenty years. The empire lasted far longer. If Weatherford's career has one aim, it is to get readers to see tribal peoples as neither cannibal barbarians nor costume-bead victims. The Mongol Empire, in his telling, was the first modern empire: one supreme law, local law beneath it, any religion, and a duty to the ethics of the sky. He looks at the world since Roosevelt's death and sees slogans and policy papers. He does not see vision.

The first campaign outside Mongolia, Weatherford says, was for the Uyghurs of western China. They were ruled by Kuchlug, son of the Naiman Tayang Khan: a Christian tribe's prince turned Buddhist, lording over Muslim subjects and outlawing Islam. The Uyghurs asked Genghis Khan to save them. A detachment drove Kuchlug out and killed him toward Pakistan. Then came the first law Genghis Khan made for people outside Mongolia. Tribal law had already banned kidnapping and selling women, because that was what tribes fought over. "Civilized" people, he saw, fought over religion. Religious freedom can mean letting churches alone. His law presumed that, and went further: every person has the right to choose, no one may stop them, no one may force them. The idea that it belonged to the person, Weatherford says, no one in history had thought of. Lex links it to individual freedom as such, and to Thomas Jefferson's later interest in Genghis Khan.

Weatherford does not call this ideology. Genghis Khan did not outlaw kidnapping because he had studied moral philosophy. His mother was kidnapped; his wife was kidnapped; he knew it hurt people. Religion was the same: a personal right to keep people from being hurt, which then drew minorities to him. He also saw the use of balance—Shia and Sunni, Christians and Jews, none dominant—so society would not unite against him. The one tradition he would not class as a religion was Confucianism. Taoists did magic and healing; what did Confucianists do? People could still be Confucian, but he did not give them the tax exemption he gave every religious institution. That exemption was later abused, as land was donated to temples to escape tax.

After Bamiyan he summoned scholars, including a Chinese master Weatherford says he despised, and Muslim leaders, for public lectures and discussions among people who otherwise would not speak. He never converted. He was an animist. Early on he worshiped Burkhan Khaldun, the mountain of his refuges, climbing to the top, hat and belt off, to pray before the sky. Away from Mongolia the local spirits were unknown, which unnerved the Mongols in China. He shifted toward the sky, the one universal spirit. In Mongolian, sky, heaven, God, and weather are the same word, *tenger*; in religious speech, eternal blue sky. Each person, he thought, could know morality without being taught it from a book. His grandson Mongke Khan told Christians, Jews, Muslims, and Taoists: you have your scriptures and you do not live by them; we have our spirits, shamans, and drums, and we live by them.

With a million people, every person had to be used. Men fought; women administered the economy at home, and his daughters ran surrounding Turkic kingdoms—Ongud, Karluk, Uyghur. He was not a modern environmentalist, but he forbade moving water to irrigate, as a violation of earth and water. Historians who call the Mongols stupid for letting irrigation die, Weatherford says, miss the policy: destroying a system takes more work than building one, and the aim was pasture, until Kublai changed it. Envoys were protected from arrest, torture, and killing; kill one of ours, and we wipe you out. Kiev was destroyed in 1240, after Genghis Khan's death, when Ogedei's army under Subutai—Weatherford's candidate for the greatest general in history—sent a woman envoy whom the city killed as a witch. We accept diplomatic immunity, women's equality, and religious freedom as ideas, Weatherford says, and still fail them. He achieved them inside his empire, in his time.

Nomads have usually been the people who carried goods from oasis to oasis. Mongols produced almost nothing at home, so they depended on trade and raised merchants high—especially shocking in China, where merchants ranked extremely low. A merchant paid the national tax once, not at every town. Rest houses offered fresh horses, food, and paper receipts good anywhere in the empire, plus an escort if the road was dangerous. Merchants would name an outrageous price, waiting to be bargained down; the Mongols often paid more. Ogedei asked a Muslim advisor where the extra money would go: still inside the empire, and it would come back. In Kublai's time, Marco Polo's father and uncle, then Polo himself, crossed the continent and returned with wealth, unharassed. Weatherford says we have no well-documented case of anyone going from China to Europe or the reverse before the Mongols. Since Genghis Khan, there has not been a year without East-West contact. It was permanent.

Ideas moved with the goods: technology, beliefs, science, even crops. Genghis Khan's organizational genius, Weatherford says, was knowing which skill each people could contribute. He took Khorezm, source of the word *algorithm*, and was impressed that Muslims used zero; herders need numbers. Mongols reduced all livestock to horse-equivalents—five cows as four horses, five sheep as one, four camels as five—and demanded a census everywhere, with each house posting people, animals, and occupations. Middle Eastern scholars became financial advisors in China, sometimes ruthless about tax. Printing, paper money, and mixed almanacs spread. Chinese gunpowder, mostly fireworks and crude bombs, met Middle Eastern naphtha, Greek fire, and European bell-casting. Turn the bell on its side, apply a flamethrower, add gunpowder: a cannon. Not in Genghis Khan's lifetime, Weatherford thinks, but soon after, at sieges such as Baghdad, with even firing rods that were not yet rifles.

In 1215 Genghis Khan took the Jin capital we call Beijing. Kublai was born about three months later, second son of the fourth son, looking, the old khan said, like his mother's Merkit people, not like a Mongol. Sorghaghtani, a Christian with a Buddhist nurse and Chinese tutors, engineered a revolution that put her eldest, Mongke, on the throne in 1251. Mongke died in 1259 on campaign in the south. Kublai was overweight, gouty, and undistinguished in the field; his mother had to order him to go administer his own overtaxed lands. When Mongke died, the youngest brother, Ariq Boke—hotheaded enough to beat a Taoist to death with a Buddha statue during a debate—was declared Great Khan in Mongolia. Kublai's wife Chabi sent coded word: forget the Song for now; take the empire. He held northern China's grain. Ariq Boke starved into submission in 1262 and died in 1264 before trial. Kublai lacked his grandfather's genius, Weatherford says, but he understood China better than most Mongols and Mongols better than most Chinese. The deathbed order remained: finish conquering China.

The Southern Song were shielded by the Yangtze and a defensive navy they chained into a Great Wall of the Sea. Aju, grandson of Subutai, had watched his father Uriyangkhadai win every battle in Dai Viet and lose the war when the enemy escaped by boat. He studied the river cities: strong on the land side, weak on the water. Engineers from the Il-Khanate adapted trebuchets to ships. The boat was no longer a woman's cart; it was a giant bow. They worked down the Yangtze. Kublai also invaded Japan, Weatherford thinks, to cut sulfur for Song gunpowder, block a refuge, and scare the monkey by killing the chicken. River ships on open water failed; samurai ritual met Mongols who had no use for reciting genealogies; Weatherford credits the Japanese more than the typhoon. The raid still cut Song supply and flight. Generals fled with jewels and child princes. Dowager Empress Xie, one-eyed, called Ugly Xie, surrendered Hangzhou to Bayan, who refused a palace ceremony: his soldiers had won in the field. There was no wholesale looting. The fleeing court dropped one child emperor in the ocean, crowned another on Lantau Island, chained boats across a harbor, and ran out of water. A minister drowned the seven-year-old Zhao Bing and his parrot rather than let the Mongols take him. Weatherford calls the man a child murderer, not a hero; Xie, he says, kept her emperor alive for decades. The men lost the war and blamed an old woman.

Unifying China cost Kublai recognition as Great Khan. The Golden Horde, the Chaghatai, and for a time others went their own way. A second Japan invasion loaded unarmed Song prisoners to farm; left and right wings from Korea and southern China sabotaged each other; Japan and a typhoon finished the fleet. Near death, Kublai sent Princess Kokochin by sea toward Hormuz; Marco Polo sailed with her. His grandson Temur Oljeitu, caned as a young drunk, later won symbolic loyalty from the whole empire and announced a turn from conquest to commerce. Then the Mongols failed to adapt in China. In 1368 they packed up and went home, Weatherford says, like another seasonal migration, still calling themselves the Yuan, never acknowledging the Ming. They even captured a Ming emperor, tried to ransom him, and sent him back when Beijing appointed another. The *yam* postal web that had unified Eurasia also carried plague out of southern China. When the system collapsed, subject peoples no longer needed the empire. Some Mongols stayed; Hazaras in Afghanistan descend from the army. In the 1700s many returned from Russia to the tent, fermented milk, and dried curds.

Genghis Khan died in 1227 after falling from his horse while hunting khulan in the Gobi, on a second campaign against the Tangut, who had refused him troops. A wife ran the camp and kept the death secret until the royal family was killed. He could nominate, not appoint, a successor. He favored Jochi; Chagatai exploded at being asked to follow a "Merkit bastard," and Genghis Khan delivered the speech about the turning sky. The sons chose Ogedei, the generous drinker. Plan B was capable women: Toregene, not even Ogedei's first wife, ruled in her own name after him, the greatest empire Weatherford knows to have been ruled by a woman, and she stopped the wars because peace was better for trade. She then favored Guyuk, who purged her court, including the minister Fatima, and died after eighteen months. Sorghaghtani, allied with the Golden Horde, put Mongke on the throne. Genghis Khan had organized the family like a corporation, all lands owned by the whole clan; it weakened every generation. A 2003 genetics paper estimated that 0.5 percent of the world's men descend from him. Weatherford believes the researchers found a real cluster and objects to pinning it on Genghis Khan without his DNA. He had four wives, children with two, and well-recorded descendants; his brother Qasar had more children. In Mongolia, he adds, nobody claims descent. The grave is unmarked on purpose. Officially you should not know the place. People believe they do. It is holy: no roads, no buildings, no killing of animals, no cutting of trees.

Asked what Genghis Khan looked like, Weatherford says the famous portrait was painted fifty years later by someone who never saw him, and it looks like a younger Kublai—legitimacy by resemblance. If you want the face, walk into any ger: the first child is the face of the nation he created. Lessons he still takes seriously: protect diplomats; do not buy, sell, or kidnap women; religious freedom of individuals; tax-free status for religions, physicians, and teachers; admit a mistake and correct it; promote on ability, not exam scores. Genghis Khan failed the last test at the end by handing power to sons. His global instinct—that everyone keep their own law under a higher law of heaven—is what Weatherford finds missing in a provincial age that talks about globalization. Women sat up front in the Mongol court, which horrified Confucians, Muslims, and Christians. *The Secret History* cuts off at the moment he says "now let us reward our daughters." Weatherford reads the wedding speeches: a daughter has three husbands—honor, nation, and the man who goes to war. She stays and rules. Later male relatives erased that.

On human nature, Weatherford loves persons and mistrusts institutions. Mongolia still keeps about one percent of land in private hands; farm and city count as one category, settled people. Hip hop there is full of praise songs to Genghis Khan that ask him for nothing. For visitors he recommends almost any direction out of the capital: the Gobi loop, Khovsgol, Kazakh eagle hunters in the west, cranes in the east, the Khentii if you want the origin country. The giant equestrian statue marks where Temujin, returning from Ong Khan, found a whip—the *tsuur*—which Weatherford reads as finding how to ride his wind horse, his *khiimori*, rather than be ridden by it. Hope, for him, is not in institutions. It is a stranger lifting his late wife's wheelchair over a broken Ulaanbaatar sidewalk without asking, a child bringing milk to a tent in the forest, tea at two in the morning after a flash flood. She had told the man who once failed college English to tell the story as if she were listening in a car. He wrote beside her wheelchair until the end. Borte made Temujin leave Jamukha; a wife told Weatherford to write. He still tells the story to her.