Tower (or Keep)The tower is a circular or square building, which was used as a lookout and for defence. The central tower in a motte and bailey castle was known as the keep.
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A battlement is the upper walled part of a castle or fortress. It's usually formed out of a low, narrow wall on top of the outermost protective wall of a fortress or castle. The word ''battlement'' traces to an old French term that means tower or turret, and the original use of battlements was for protection.
A gatehouse is a castle's fortified gateway to control the entrance or entry point. The entrance to a castle was usually the structurally weakest point in a castle wall and the most probable attack point, so they were fortified with the extra defenses of a gatehouse to compensate.
In the Middle Ages the great chamber was an all-purpose reception and living room. The family might take some meals in it, though the great hall was the main eating room.
The most important room in a castle was the Great Hall. This is where all the members of the household sat down to eat at tables set up for every meal. It was where feasts were held for special days, or when there were guests. King Arthur's Pentecost Feast takes place in such a Hall.
Castle Battlements and ParapetsThe raised sections of the battlement were known as merlons and the lower parts were called crenels. Crenels, sometimes called embrasures, were regularly spaced gaps in the castle battlement. Castle defenders could take protection behind the merlons and fire arrows from the crenels.
A bailey is the sturdy wall around a castle that keeps invaders out. The bailey of a medieval castle was usually built of stone. You might see a bailey — or the remains of one — if you tour a castle in England or France.
In fortification architecture, a bank or rampart is a length of embankment or wall forming part of the defensive boundary of a castle, hillfort, settlement or other fortified site. It is usually broad-topped and made of excavated earth and/or masonry.