they built round keep castles because they did
Round Keep Castles were a type of castle during the medieval times. They were not built on a motte, unlike shell keeps. They were an adaptation of the square keep castles except they had round or polygonal walls. Medieval builders couldn't make the round keep castles as big as the square keep castles, so they were often cramped for space.
Square keep castles were mainly built far from villages
Shell keep castles are medieval fortresses that are usually built upon a motte. They are made from stone. Some examples of stone keep castles include the Round Tower on Windsor Castle and the Clifford's Tower on York Castle.
Castles were built only for kings because they were used to keep the kings built.
stone
They were built in the year 1172
Stone keep castles were built in 11th - 13th centuries.
1087
1949
Shell Keep castles were built in the year 1172! +++ Not sure where the adjective "shell" comes from, but castles with a keep - the central building in the complex, and the main accommodation - were built mainly in the few centuries of the Mediaeval period , not just in one arbitrary year.
Castles in the Middle Ages were used to keep out enemies.
William the Conqueror first built stone keep castles to show that he is not scared of the British