Medieval demography refers to the study of human demography in the Middle Ages. It is an estimate of the number of people who were alive during the Medieval period, population trends and movements. In many ways, demography was one of the most crucial factors of historical change throughout the Middle Ages.
Reasons for this expansion and colonization include an improving climate known as the Medieval warm period allowing longer and more productive growing seasons; the end of barbarian raids by Vikings, Magyars and Saracens resulting in greater political stability; advancements in medieval technology allowing more land to be farmed; reforms of the Church in the 11th century further increasing social stability; and the rise of Feudalism, which also brought increased social stability and thus more mobility. Nobles encouraged colonization. The bonds of serfdom which tied peasants to the land began to weaken with the rise of a money economy. Land was plentiful and labor to clear and work the land was scarce, lords who owned the land found new ways to attract and keep labor. Urban centers began to emerge, able to attract serfs with the promise of freedom. As new regions were settled, both internally and externally, population naturally increased.
By the 14th century the frontiers had ceased to expand and internal colonization was coming to an end, but population levels remained high. Then in the 14th century a number of calamities struck. Starting with the Great Famine in 1315, then the Hundred Years' War and the Black Death of 1348-1350, the population of Europe plummeted.
Historians have struggled to explain how so many could have died. There are problems with the long-standing theory that it was just caused by a medical illness (see further discussions at Black Death) and so social factors are looked at. A classic Malthusian argument has been put forward that says Europe was overcrowded with people, even in good times it was barely able to feed its population. A gradual malnutrition developed over decades lowering resistance to disease, and competition for resources meant more warfare. In short, the catastrophes were Malthusian checks on a population too large for its available resources. However, critics say that if this were true, the sudden fall in population would have endowed the survivors with abundant resources which would enable them to recover quickly. This was not the case; populations continued to fall and remained low almost to the 16th century. Thus, classic Malthusian theory does not offer a fully satisfactory explanation.
The most recent, although still tentative, explanation goes like this: by 1250, the population peaked and competition for resources meant that there was a great imbalance between property owners and workers. Rents went up, and wages sank, the unequal distribution of wealth increased between rich and poor. The conditions of the poor became so bad, they achieved net zero population growth. The economic conditions of the poor also aggravated the calamities of the plague because they had no recourse, such as fleeing to a villa in the country like the nobles in the Decameron, the poor lived in crowded conditions and could not isolate the sick, and had weaker immunities from a lacking diet and difficult subsistence lifestyle. After the plague and other exogenous causes of population decline this caused wage increases because of a lower labor supply, and a redistribution of wealth; however this did not happen right away because property owners resisted change through wage freezes and price controls. The wage freezes and price controls were partly responsible for popular uprisings, such as the Peasants' Revolt of 1381, and not until the later 15th century did the lower classes start to gain benefits. By 1500 the total population of Europe was substantially below that of 200 years earlier, but all classes overall had a higher standard of living.
Examples of field data include the physical size of a settlement, and how it grows over time. The appearance, or disappearance, of settlements, for example after the Black Death the archaeological record shows the abandonment of upwards of 25% of all villages in Spain. However there are problems that limit the use of archaeological data. It is often difficult to assign a precise age to discoveries. As well, some of the largest and most important sites are still occupied and can not be investigated, thus limiting the archaeological record to the more peripheral regions, for example early Middle Ages Viking burials at Sutton Hoo, in East Anglia in England, for which otherwise no records exist.
Because of the limitations of field data, most of what is known about Medieval demographics comes from written records, which can be categorized into descriptive accounts, and administrative accounts. Descriptive accounts include those left by chroniclers when they wrote of the size of armies, victims of war or famine, participants in an oath. However, many of these accounts were embellishments, and thus act as supporting evidence and never taken factually on their own.
The most important written accounts are those taken from administrative records. These accounts are more objective and accurate because the motivations for writing them were not to influence others. These records can be divided in to two categories: surveys and serial documents. Surveys cover an estate or region on a particular date, rather like a modern inventory. Manorial surveys were very common throughout the Middle Ages, in particular in France and England, but faded as serfdom gave way to a money economy. Fiscal surveys came with the rise of the money economy, the most famous and earliest being the Domesday Book in 1086. The Book of Hearths from Italy in 1244 is another example. The largest fiscal survey was of France in 1328. As kings continued to look for new ways to raise money, these fiscal surveys increased in number and scope over time. Surveys have limitations, because they cover only a snapshot in time they do not give long term trends, and they tend to exclude elements of society.
Serial records come in different forms. The earliest are from the 8th century and are land conveyances such as sales, exchanges, donations, and leases. Other types of serial records include death records from religious institutions and baptism registrations. Other helpful records include heriots, court records, food prices and rent prices, from which inferences can be made.
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