An underground prison or vault, or the strongest fortification of a castle, usually a keep (tower), where the surviving inhabitants and defenders intend to make their last stand in case an ennemy overruns the outer defences; see dungeon (sometimes spelled "donjon");
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A dungeon (derived from the Old French donjon, from the Latin dominus, "lord"), in its original medieval usage, was the keep, the main tower of a castle which formed the final defensive position the garrison could retreat to when outer fortifications were overcome.
The dungeon was a safe, if not comfortable, place to keep prisoners and was used mainly for this purpose, once more luxurious housing for the lord of the castle was constructured.
Its meaning has evolved to also mean an underground prison or vault, typically built underneath a castle.
A dungeon (or donjon) is an underground prison or vault, typically built underneath a castle.
In its original usage the Donjon is the keep, the main tower of a medieval castle which formed the final defensive position the garrison could retreat to when outer fortifications were overcome.