A quieter beginning
After the western Roman Empire declined, towns in much of Europe shrank. Many Roman cities survived as bishops’ seats, small markets or fortified refuges, but they were far smaller than in imperial times. In northern Europe towns were often few. Italy and the Mediterranean world kept more urban continuity, and parts of the Byzantine and Islamic worlds had far larger cities than anything in the Latin West.
From about the eleventh century the picture began to change. Over the next two or three centuries towns multiplied and grew, and by the thirteenth century Europe had a denser network of urban places than it had known for some time. Historians usually describe this as a long, uneven process rather than a sudden boom.
What drove the growth
No single cause explains it, and scholars weigh the factors differently.
Better farming. Improvements in agriculture allowed more food to be produced. Heavier plows suited to northern soils, wider use of horses for field work in some regions, and rotation systems that left less land idle all helped, though the pace and spread varied. Open field farming spread across large parts of northern Europe. Surplus food made it possible for more people to live without farming, as craftsmen, traders and clerks in towns.
Population growth. Europe’s population rose substantially during these centuries. Estimates are rough and debated, but many historians think it grew considerably, perhaps by a large fraction or more. The increase put pressure on land and sent people looking for work elsewhere, including in towns.
Greater security. The decline of the worst raiding from outside, such as the Viking and Magyar incursions, reduced the risk of regular devastation in many regions. A somewhat safer environment encouraged settlement and investment.
Revived trade. Merchants moved goods along rivers, coasts and overland routes. Italian ports linked Europe to the eastern Mediterranean, while northern traders carried grain, fish, timber, furs and cloth. Regular fairs, such as those in Champagne, brought merchants together at fixed times. Towns grew at crossings, harbors and junctions where trade passed through.
Local demand. Lords, bishops and monasteries needed craftsmen, builders and suppliers. Large building projects, military campaigns and growing courts all created steady demand for goods and services.
Textile production. Cloth was the great industrial product of the age. Flanders and northern Italy in particular developed major cloth industries, supported by the wool trade that supplied raw material from England and elsewhere. Cloth working employed many people and made certain cities wealthy.
How towns were founded
Towns grew in several ways. Some developed organically around an existing church, castle or market. Others were planned. Lords and kings founded new towns, often with grid-like streets and standard plots, and offered settlers privileges to attract them. In southwestern France, for example, planned towns known as bastides were established in the thirteenth century. Planned settlements also appeared in Germany, England and parts of eastern Europe, where German settlers established many towns under their own legal customs.
A lord’s motives were mainly economic. A successful town brought rents, tolls and market dues, and a charter promising limited freedoms helped to attract residents.
What towns looked like
Medieval towns were crowded and compact. Walls limited their physical size, so houses were packed tightly and built upward. Streets were narrow, and craftsmen often lived and worked in the same building, with a shop at the front. Markets, churches and guild halls served as focal points. Many people kept some link to the countryside, such as a garden, a pig or a plot outside the walls.
Towns also had to deal with practical problems: water supply, fire, waste and food provisioning. Medieval towns were not as hopelessly filthy as often claimed, since many had rules about waste, paving and market hygiene, but crowding did make disease and fire serious risks.
How big were they?
It is important not to overstate urban size. Most medieval towns were small by modern standards, often with only a few thousand inhabitants or fewer. A relatively small number of cities were much larger. Paris, Venice, Genoa, Milan and Florence are generally counted among the largest cities in Europe at their peaks, with populations often estimated in the tens of thousands to well over a hundred thousand, but figures vary and should be read with caution. Large parts of the population still lived in villages, and peasant daily life remained the experience of most Europeans.
Towns and freedom
Urban growth altered the social map. Towns created new groups, such as merchants, artisans, lawyers and bankers, that did not fit neatly into the old idea of those who pray, fight and work. People moved from the countryside to the town for opportunity, sometimes to escape the burdens of the manor. Lords sometimes resisted this movement and sometimes accepted it because it brought benefits.
Rising wealth and numbers also gave townspeople more bargaining power. Where overlords were weak or needed money, towns won charters, councils and courts. In the strongest cases, particularly in northern Italy, parts of Germany and Flanders, urban growth supported something close to self-governing states.
The limits of the boom
Growth did not continue indefinitely. By the early fourteenth century, parts of Europe appeared strained. Land was scarce in some regions, and a series of bad harvests and famine around the 1310s hit many areas hard. Then the Black Death arrived in the late 1340s and killed a large share of the population, though estimates vary by region. Towns recovered unevenly, and some never regained their earlier numbers. Urban growth was therefore a major feature of the high Middle Ages, but not a straight line.
Why this matters for city-states
City-states depended on this growth. Without enough people, wealth and defensible walls, a town could not resist a lord or an emperor. Understanding the farming, trade and population changes of the period helps explain why self-rule appeared when and where it did.