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keep, donjon

The stronghold of a medieval castle, usually in the form of a massive tower, and a place of residence, esp. in times of siege.
References in classic literature ?
Some small houses on the side of the road leading to Corbeil, an inn, called the "Auberge du Donjon," which offered passing hospitality to waggoners; these were about all to represent civilisation in this out-of-the-way part of the country, but a few leagues from the capital.
To the right of the Tournelles, that truss of enormous towers, black as ink, running into each other and tied, as it were, by a circular moat; that donjon keep, much more pierced with loopholes than with windows; that drawbridge, always raised; that portcullis, always lowered,--is the Bastille.
Finally, far away to the east, Vincennes, and its seven quadrangular towers to the south, Bicêtre and its pointed turrets; to the north, Saint-Denis and its spire; to the west, Saint Cloud and its donjon keep.
It was a fortress of no great size, consisting of a donjon, or large and high square tower, surrounded by buildings of inferior height, which were encircled by an inner court-yard.
Et c'est precisement sur le fond de cette fresque vivace et polychromique donnant a voir tantot ruelles etroites, tantot donjons creneles, que le jeune artiste marocain Mehdi Nabloussi allait enfievrer une assistance venue en nombre tendre l'oreille aux melodies typiques d'un Maroc en mouvement.
With the addition of bastions and donjons in the Medieval period the early Byzantine fort enclosures are generally infilled with new structures, where they form one of the inner or outer rings of defence.