They weren't. The word keep was not used until after the medieval period had ended - the word used was donjon and donjons came in many different shapes and sizes, including some with a long, sharply angled extension like the prow of a ship. Nobody categorised castles by the shape of the donjon - that it a completely modern idea.
This is because the keep itself is made out of Stone. they were built in medieval times.
mote and bailey castles and stone keep castles and Concentric Castles
Stone keep castles were built in 11th - 13th centuries.
Stone.
stone
Square keep castles (or stone keep castles) were made out of stone; you can probably tell from the name! Hope this helps.
motte and bailey, stone keep castles and concentric castles
Becuase of me
This depends on what type of castle your referring to. In the Norman times, there were two different types of castles built. There were Motte and Bailey castles and Stone keep castles (Stone castles). The Motte and Bailey castles were made out of wood and the Stone keep castles were made out of stone (obviously).
they all did IT.
Castles were built in various styles and forms throughout history, depending on the time period and region. Some common types include motte-and-bailey castles, concentric castles, and stone keep castles. Motte-and-bailey castles were early medieval fortifications consisting of a wooden or stone keep built on a raised earthwork called a motte, with an enclosed courtyard known as a bailey. Concentric castles were developed in the 12th and 13th centuries and featured multiple layers of defensive walls and towers. Stone keep castles, also known as Norman castles, were constructed primarily in the 11th and 12th centuries and featured a central stone tower or keep surrounded by walls and other structures.
No, all castles are different in some way. These are the different types of castles: * Motte and Bailey castles (made out of wood) * Stone keep castles or just stone castles (made out of stone) * Concentric castles (also made out of stone)