Bible Encyclopedias
Donjon
1911 Encyclopedia Britannica
 (from a Late Lat. accusative form domnionem, connected with domnus or dominos, a lord), the French term for the keep of a medieval castle, used now in distinction to "dungeon", the prison, which is only an anglicized spelling (see also Keep).
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Donjon'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​d/donjon.html. 1910.