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history of Prussia is the history of a frontier district. In the ninth century, Charlemagne had transferred the old centre of civilisation from the Mediterranean to the wild regions of northwestern Europe. His Frankish soldiers had pushed the frontier of Europe further and further towards the east. They had conquered many lands from the heathenish Slavs and Lithuanians who were living in the plain between the Baltic Sea and the Carpathian Mountains, and the Franks administered those outlying districts just as the United States used to administer her territories before they achieved the dignity of statehood.

The frontier state of Brandenburg had been originally founded by Charlemagne to defend his eastern possessions against raids of the wild Saxon tribes. The Wends, a Slavic tribe which inhabited that region, were subjugated during the tenth century and their market-place, by the name of Brennabor, became the centre of and gave its name to the new province of Brandenburg.

During the eleventh, twelfth, thirteenth and fourteenth centuries, a succession of noble families exercised the functions of imperial governor in this frontier state. Finally in the fifteenth century, the House of Hohenzollern made its