a keep and its the most important part in the castle
The donjon is a fortified tower in a castle, meant as a last defense in case of an attack.
Dungeon
Modern word: dungeon
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.
Donjon is the Anglo-Norman French word for the main central tower in a castle, whether it was constructed of timber or stone. The word donjon was used throughout the medieval period; in the 16th century, when castles were no longer being built, the word "keep" was used instead and this incorrect word is the one that many people still use today.
The chief tower, also called the keep; a massive tower in ancient castles, forming the strongest part of the fortifications. See Illust. of Castle.
the purpose in castle was to defend and to impress
The population of Le Donjon is 1,067.
Nothing, since the term "keep" was not used until the medieval period had ended.The term "donjon" was used, meaning the strong central tower of a castle - either of timber on an earth mound (in early castles), or of stone in later castles.
I dont know how they changed the purpose of the castles between 1300 and 1400
The area of Le Donjon is 37.02 square kilometers.
Neuilly-en-Donjon's population is 235.
Tower