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books.google.co.uk - During the Middle Ages, castles and other fortified buildings were a common feature of the European landscape. As central powers rose and fell, the insecurity of the times inspired a revival of fortifications first introduced in the Roman Empire. Despite limitations in construction techniques and...https://books.google.co.uk/books/about/Castles_and_Fortified_Cities_of_Medieval.html?id=J5CQZK1_NoAC&utm_source=gb-gplus-shareCastles and Fortified Cities of Medieval Europe
