Ostsiedlung
Social and demographic background

Political and military events were greatly influenced by a massive population increase throughout Europe in the High Middle Ages. From the 11th to the 13th centuries, the population in the kingdom of Germany increased from about four to twelve million inhabitants. During this time, the High Medieval Landesausbau (inland settlement) took place, when arable land was largely expanded at the expense of forested areas. Although new land was won and numerous settlements created, demands could not be absorbed. Another factor was a surplus of offspring of the nobility who were not entitled to inheritance, but after the success of the first crusade, took their chances of acquiring new lands in the peripheral regions of the Empire.

There is no doubt that there were "rather numerous German settlers" in Eastern Central who were responsible for bringing German law in the earliest stages of the colonization. Other settlers included Walloons, Jews, Dutch, Flemish, and later Poles, especially in the territory of modern Ukraine.

The migration of the Walser in the territory of present-day Switzerland to areas that had formerly been inhabited by Romans. The Walser settlers left their homes in Valais and founded villages in the uplands of the Alp valleys (in the north of Italy and in the Grisons).
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