For most of history, the settled peoples of Asia and Europe looked down on the nomads of the steppes — the vast grasslands stretching from Mongolia across Central Asia to eastern Europe. Yet in the thirteenth century the nomads astonished the world by creating the largest land empire in history: the Mongol Empire of Genghis Khan and his successors. This chapter studies the society, political organisation and conquests of the Mongols, and asks how a nomadic people could build such a mighty state.
Nomadic society was based on pastoralism — the herding of animals such as sheep, goats, horses, cattle and camels. Nomads moved seasonally with their herds, and their entire culture was adapted to mobility: dwellings of felt (the yurt or ger), the use of horses, and a social organisation based on clans and tribes. The steppe environment was harsh and unpredictable, and survival depended on skill, mobility and cooperation.
The Mongols transformed this mobile society into a disciplined war machine under Genghis Khan. Their conquests joined China, Central Asia, the Islamic world and eastern Europe into a single political and commercial space. The so-called Pax Mongolica — Mongol peace — reopened the great land routes of the Silk Road, enabling an unprecedented exchange of goods, people and ideas between East and West.
The steppe nomads lived by herding animals that could move with them. The horse was central to their way of life, used for riding, hunting, warfare and transport. Sheep provided wool, meat and hides; horses and camels carried loads; and cattle and goats supplied milk and other products. The nomads lived in yurts (felt tents) that could be dismantled and loaded onto wagons in a few hours.
Nomadic society was organised into clans and tribes, and status depended on skill in riding, herding and warfare rather than on landed wealth. There was no private ownership of pasture in the settled sense; instead, rights over grazing grounds and migration routes were regulated by tribal custom. This social flexibility allowed talented warriors to rise rapidly, whatever their birth.
Life on the steppe was hard. Droughts, severe winters and livestock epidemics could destroy a community's wealth overnight. Pastoralists therefore also traded with settled agriculturalists and, when conditions demanded, raided them. They exchanged horses, wool and hides for grain, metal, textiles and manufactured goods. The relationship between steppe and sown — nomad and farmer — was a complex mix of trade, tribute, migration and warfare.
Genghis Khan was born around 1162 CE with the name Temujin, son of a minor chieftain of the Borjigid clan. His father was poisoned when Temujin was a boy, and his family fell into poverty and danger. Through courage, loyalty and skill, Temujin gradually built a following, defeating and winning over rival Mongol tribes one by one.
By 1206, Temujin had united the Mongol tribes of the eastern steppe. A great assembly of the tribes, the kuriltai, proclaimed him Chinggis Khan ("universal ruler" or "Genghis Khan"). He then set about organising his people and army for war and government. His aim was to bind the tribes into a single state and to channel their energies outwards, away from internal feuds.
Genghis Khan's genius lay in organisation. He broke up the old tribal groupings and reorganised his forces into decimal units — groups of ten, hundred, thousand and ten thousand (tumen). He recruited his personal guard (keshig) from across the tribes, creating loyal officers directly dependent on him. He also adopted a writing system for the Mongol language and a legal code (yasa), promoting order and communication across his growing domain.
From 1206 onwards, the Mongols launched a series of astonishing campaigns. Genghis Khan first conquered the Tangut kingdom of Xia and then, in 1211, invaded the Jin empire of northern China. Turning west, he destroyed the Khwarazmian empire of Persia and Central Asia, and his armies pressed into what is now Afghanistan and southern Russia. By the time of his death in 1227, he ruled an empire stretching from the Pacific to the Caspian Sea.
The Mongol armies were feared for their mobility, discipline and terror tactics. Mounted archers could ride and shoot with devastating accuracy; armies moved on horseback with herds of livestock as supplies, and messages were carried across the empire by a relay system of riders. Cities that resisted were destroyed, and their populations were massacred or enslaved — a policy that discouraged resistance and terrorised opponents.
After Genghis Khan's death, his successors continued the expansion. His grandson Kublai Khan conquered southern China, completing the conquest of China and founding the Yuan dynasty in 1271. The Mongols also destroyed Baghdad in 1258 and extended their power into Korea and Southeast Asia, though their attempted invasions of Japan and Java failed. By the late thirteenth century the empire had divided into four major khanates, each ruled by a descendant of Genghis Khan.
The Mongols were remarkably effective administrators. They ruled through a combination of military power, religious toleration and commercial patronage. Because the empire was held together by communication, Genghis Khan and his successors created the yam — a system of post stations and relay riders that carried messages, envoys and officials swiftly across the steppe, the ancestor of a modern postal system.
The Mongols adopted the administrative practices of the peoples they conquered. Persian officials helped govern the western lands, while Chinese and Muslim officials served in the east. The Mongols were religiously tolerant, protecting Buddhism, Islam, Christianity and other faiths, provided that loyalty to the khans was maintained. Craftsmen and scholars were spared in conquests because their skills were valuable to the empire.
Trade flourished as never before. The Silk Road, which connected China with the Mediterranean, was safe for merchants under Mongol protection. Caravans carried silk, porcelain, spices, furs and ideas across Eurasia. European travellers such as Marco Polo journeyed to the court of Kublai Khan and wrote of the wealth and order of Mongol China. This period of relative peace and open trade is called the Pax Mongolica.
The Mongol Empire transformed the political map of Eurasia. It connected China and the Islamic world for the first time under one rule and opened vast routes of communication, trade and cultural exchange. Technologies and ideas — paper-making, printing, gunpowder and the use of the compass — travelled between East and West along these routes. The empire also brought peoples of different religions and cultures into closer contact than ever before.
The Mongol state also had a lasting influence on the regions it conquered. In China, the Yuan dynasty ruled until 1368, when it was overthrown by the Ming. In Persia and Central Asia, Mongol and later Turkic dynasties such as the Timurids shaped Islamic culture. The Mongols contributed to the making of the modern world by demonstrating that a vast, multi-ethnic empire could be held together by communication, toleration and trade rather than solely by shared culture.
Yet the Mongol empire also left a memory of terror. The destruction of Baghdad and the massacres of resisting cities scarred the Islamic world. The empire fragmented within a generation of Kublai Khan, as the four khanates grew apart. Nevertheless, the Mongols changed the course of world history: by linking East and West, they accelerated the circulation of goods and ideas that helped shape the modern era.
| Figure / Event | Date | Significance |
|---|---|---|
| Birth of Temujin (Genghis Khan) | About 1162 CE | Future unifier of the Mongols |
| Kuriltai proclaims Genghis Khan | 1206 CE | Unification of Mongol tribes |
| Conquest of Jin empire | From 1211 CE | Mongol invasion of northern China |
| Death of Genghis Khan | 1227 CE | Empire from the Pacific to the Caspian |
| Kublai Khan founds Yuan dynasty | 1271 CE | Mongol rule over all of China |
| Sack of Baghdad | 1258 CE | Destruction of the Abbasid caliphate |
| Unit | Size | Note |
|---|---|---|
| Arbitan (arbat) | 10 | Basic decimal unit |
| Zagun | 100 | Hundred soldiers |
| Minghan | 1,000 | Thousand soldiers |
| Tumen | 10,000 | Ten thousand; largest standard unit |
The Mongol empire proved that a nomadic people could build a state of continental scale and sophistication. Rooted in the mobile pastoralism of the steppe, Genghis Khan created a disciplined army and a unified people, and his successors carried Mongol power from China to the Mediterranean. The empire's administration — the decimal army, the yam postal system, religious toleration and protection of trade — made possible the Pax Mongolica, during which the Silk Road reopened and goods, technologies and ideas flowed between East and West. Though the empire fragmented and its conquests left a trail of devastation, the Mongols decisively shaped the modern world by connecting its great civilisations.