Why did the design of castles change?

Castle designs have changed over history. This is because of changes in technology over time – as well as changes to the function and purpose of castles. The first castles were simply 'mounds' of earth, and medieval castle designs improved on these basics – adding ditches in the Motte & Bailey design.



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The castlellated form seems to have gone largely out of fashion by the 16th century as the spread of powerful artillery led to the development of squat blockhouse-like forts (see the Military Structures selection guide), although many castles continued in use, mainly as residences, for many centuries.

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By the 1600s, people didn't want to live in cold and damp castles anymore. Kings, queens and noble men wanted to show off how important and rich they were so they built palaces and great houses. Many existing castles were replaced with much grander homes.

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Initially, castles were built out of wood, but eventually, people made castles from stone because they were stronger and lasted longer. Castles usually consisted of a group of buildings that were surrounded by a huge wall and a moat designed to keep attackers out.

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After the 16th century, castles declined as a mode of defense, mostly because of the invention and improvement of heavy cannons and mortars. This artillery could throw heavy cannonballs with so much force that even strong curtain walls could not hold up.

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The natural ventilation inside the castle was achieved through five main elements: the large pool in the garden at the front, the fountain located on the ground floor, the two ventilating chimneys and large wet sheets hung beneath the ceilings of the various rooms on the upper floors.

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Living in a medieval castle was often uncomfortable and even hazardous, particularly for those who were not part of the nobility or royalty. For example, despite their grandeur and imposing appearance, many castles lacked basic amenities like running water, central heating, and proper ventilation.

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Windsor Castle is the oldest and largest inhabited castle in the world and has been the family home of British kings and queens for almost 1,000 years. It is an official residence of Her Majesty The Queen and is still very much a working royal palace today, home to around 150 people.

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The entrance to the castle was always its weakest point. Drawbridges could be pulled up, preventing access across moats. Tall gate towers meant that defenders could shoot down in safety at attacks below. The main gate or door to the castle was usually a thick, iron-studded wooden door, that was hard to break through.

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They were very vulnerable to attacks using fire and the wood would eventually start to rot. Due to these disadvantages, King William ordered that castles should be built in stone. Many of the original timber castles were replaced with stone castles.

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Until the late 12th century castles generally had few towers; a gateway with few defensive features such as arrowslits or a portcullis; a great keep or donjon, usually square and without arrowslits; and the shape would have been dictated by the lay of the land (the result was often irregular or curvilinear structures).

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