Crenellation
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Crenellation (or crenelation) is the name for the distinctive pattern that framed the tops of the walls of many medievel castles, often called battlements. Crenellation most commonly took the form of multiple, regular, rectangular spaces cut out of the top of the wall to allow defenders spaces to shoot arrows from and other spaces to hide behind full cover.
Taymouth_castle_1.jpg
The technical name for an opening in crenellations is embrasure, while the raised portions of the wall between them are called merlons or crenels. Crenellations would have been used originally on defensive walls built around a settlement (with or without a castle), but the modern experience of them is mainly their appearance on the towers and turrets of castles and mock-castles. They can also be seen in large numbers on the Great Wall of China.
Crenellations are easy to build, and have been used to give a castle-like look to buildings for a long time, especially in baronial architecture. However, some have suggested (http://www.trp.dundee.ac.uk/research/glossary/crenella.html) that as an ornamental feature they may have a very long history, with a 'license to crenelate' being granted to the privileged. 'Real' crenellations for defensive use might be expected to have embrasures that are narrow and tall, to allow an archer to conceal his body for safety behind the merlons.
Ornamental crenellations are often evenly spaced and too small for practical archery. The size of ornamental crenellations is likely to be dictated by the scale of the building to which they are attached. The practical use of crenellations, and the idea that a castle could be defended at all, cannot long have survived the introduction of gunpowder and artillery.
Crenellation is also called castellation. Some writers consider these terms to have slightly different meanings. (Example, on Ontario Architecture site: crenellation (http://www.ontarioarchitecture.com/crenelation.html), castellation (http://www.ontarioarchitecture.com/castellation.html).)Template:Arch-stub