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A Square Keep castle usually sits on a hill. It only has 1 wall of defence, whereas a concentric castle usually has about 3 thick walls. Concentric's also have a keep in the middle that has a wall 2.5 metres thick!
The difference between a stone keep castle and a concentric castle is that a stone keep castle had hardly any defence. The only defence was their high walls. But the concentric castles had loads of walls surounding them. The word 'concentric' actually means with common middle point: describes circles and spheres of different sizes with the same middle point.
The same weapons that were used to attack any other castle!!
The military commander of a castle was called a castellan. The castellan might also be the majordomo, running the civilian staff as well. In French the same position was called a Chatelain. In German the same position was called a Burgmann. If the question is who might otherwise posses a castle rather than a king or queen, then there would have been middle rank nobles who had a castle of some sort. While we tend to think of castles as elaborate stone structures, many were simpler. A more basic castle might be a simple stone keep with a surrounding wall, either of stone or or wood. Another basic castle style was the shell keep, which is a round stone wall, with wooden or stone structures built backing to the exterior wall, and with an open central courtyard.
The same people who built them. Mainly stone masons.
They did not change from shell keep castles to square keep castle, they existed at the same time. Most shell keeps were a result of replacing the wooden towers on top of the man made Mottes (erected as a quick way of making a castle) with stone buildings, as they were man made it was often thought they would not take the weight of keep with very tall thick walls like the Tower of London so they made shell keeps, with thinner walls. To build a substantial keep they would have to demolish the Motte. You would have thicker stronger walls with a square tower, but the extra height on top of the motte is also a defensive advantage, and it woule be cheaper.
Yes, in 1095 approx. Guy de Baliol built a motte and bailey castle before Bernard de Baliol built a stone castle on the same site.
it had changed by expansion and material such as it was timber they changed it for stone and brick instead !
The Gate House controls the entrance through the wall and into the castle. The castle is the name for the entire fortified building. The gate house, keep, chapel, wall (etc) are different parts of the castle.
The main building was known as 'the keep'. The outer wall was usually known as the 'barbican'. Many had a moat and a drawbridge. A great hall was also a common feature. The area inside the wall was called the bailey, the same as the term used in the motte and bailey castle design. you can just say this is a stupid question
It is difficult to obtain an exact figure. Some wooden castles were replaced by stone castles on the same spot. Does that count as a wood castle, as a stone castle or both? Ruined wood castles are more likely to disintegrate into nothing whereas stone castles are more likely to leave recognisable ruins, so the number of the former is likely to be underestimated.
They did not change from shell keep castles to square keep castle, they existed at the same time. Most shell keeps were a result of replacing the wooden towers on top of the man made Mottes (erected as a quick way of making a castle) with stone buildings, as they were man made it was often thought they would not take the weight of keep with very tall thick walls like the Tower of London so they made shell keeps, with thinner walls. To build a substantial keep they would have to demolish the Motte. You would have thicker stronger walls with a square tower, but the extra height on top of the motte is also a defensive advantage, and it woule be cheaper.