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A keep is a strong central tower which forms the heart of a castle. It is usually a central square tower house. Often the keep is the most defended area of a castle, and as such may form the main habitation area, or contain important stores, or the armoury. An earlier name for this, still used for some medieval monuments, is Donjon.
Some castles were in fact, no more than a keep. Often these are simply referred to as "tower houses".
The keep commonly houses the lord or king that lives there and usually marks the highest point of the castle. Some of them contained donjons, or dungeons.
Types of Keeps
The most basic form of keep is the strong central tower.
Forming an intermediate style between the true castle and the keep is the Shell Keep, which is a strong circular wall surrounding a ring of buildings around a central courtyard.
Famous Keeps
One of the most famous keeps in England is the celebrated White Tower of the Tower of London constructed by William the Conqueror in the aftermath of the Norman Conquest.
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