Why did King William I want to build his castles out of stone?

King William the I (William the conqueror) didn't build all his castles out of stone. In fact, most of the castles he built were made out of wood. These wooden castles were called Motte and Bailey castles.

The castles that he did build out of stone were called Stone Keep Castles (Stone Castles) King William built the Stone Keep Castles out of stone because stone is stronger than wood, doesn't rot within a few years and doesn't burn easily.

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