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CONCENTRIC
square stone keep castle
round keep castle.
Concentric
1st. motte and bailey castle 2nd. square keep castle 3rd. shell keep castle 4th. concentric castle
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 concentric castle
No, concentric castles were built after stone keep castles.
a round keep castle has round corners so it is harder for it to be undermined A concentric castle is basically square
When gunpowder and cannons were invented, castles where more used for homes and less for defence.
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.
Headingham Castle seems to be believed to have been a concentric castle.However, it is a Stone Keep Castle.