When William the Conqueror took hold of England in 1066, he brought with him the culture and ideas of another people. One of the innovations imported was the stone keep. This building would dominate the English skyline for five centuries and be the cornerstone of defense for the feudal lord of the middle ages. Both the design and the evolution of the English towers and curtain-walled castles relied on defensive measures. Without the invention of new ways to defend and protect, the castle as we know it would not be standing today.
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