Probably
On SQUARE KEEP Castles, they have corners, therefore attackers can dig underneath them, whereas CONCENTRIC CASTLES have one round wall, so this cannot happen.
mote and bailey castles and stone keep castles and Concentric Castles
No, concentric castles were built after stone keep castles.
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.
What is concentric castle like
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.
mannor house
concentric castles
No
motte and bailey, stone keep castles and concentric castles
Motte and Bailey castles and Concentric castles
It is that they have been made into concentric castles