Introductioncastle, type of fortified dwelling characteristic of the Middle Ages. Fortification of towns had been in practice since antiquity, but in the 9th cent. feudal lords began to develop the private fortress-residence known as the castle. It served the twofold function of residence and fortress because of the conditions of medieval life, in which war was endemic. The site of the castle was preferably on a defensible height. England and France, in general, did not afford such inaccessible locations as did the Rhine valley in Germany.
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