Because they had better defenses than the Motte and Bailey castles and the Norman Keep Towers.
Also, people had to keep on building better castles and better weapons were made.
A concentric castle (or multiple castle) is a castle within a castle
There is no fixed size. It depends on the location and the purpose.
yes it is as it is a castle within a castle as is the meaning of concentric
CONCENTRIC
In 2001, the design for a concentric castle changed.
Concentric
concentric castle
concentric castle
its a concentric castle
What is concentric castle like
king edward built the first concentric castle
No, concentric castles were built after stone keep castles.