It is known that in 1100 there were no private castles in England, in 1150 a lot of them appeared, and in 1200 less

It is known that in 1100 there were no private castles in England, in 1150 a lot of them appeared, and in 1200 less than a hundred remained. How can this be explained?

William I and his sons were forbidden to build private castles. Later, during the long strife between Stephen and Matilda, the nobility grew bolder and began to build castles. Then Henry II destroyed most of them, except those located on the borders with Wales and Scotland.

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