On SQUARE KEEP Castles, they have corners, therefore attackers can dig underneath them, whereas CONCENTRIC CASTLES have one round wall, so this cannot happen.
Motte and bailey castles, Stone keep castles and Concentric castles
No, concentric castles were built after stone keep castles.
What is concentric castle like
Newer castles were made with stone and rounded corners. the reason was that it was an advance round corners were good because they had fewer space to hide and also the shape deflected any catapults or missiles.
The defences of a concentric castle were round towers - It was harder for attackers to make round towers collapse. Unlike square towers they had no corners, which collapsed if holes were dug underneath the foundations.
concentric castles
mannor house
Stone castles, Concentric castles, Motte and Bailey Castles
No
motte and bailey, stone keep castles and concentric castles
Motte and Bailey castles and Concentric castles