Castles are occupied defensive structures which are built to defend a large swathe of territory by denying any potential enemy freedom of movement.
That purpose (defense) and that method (denying freedom of movement) are key to understanding how castles function, why they matter, and why they sprang up everywhere across Europe. So remember it: a castle is built in order to deny an enemy freedom of movement. We’ll get into what that actually means below.
But let’s stay on this definition for a moment, because, while all castles are fortifications, not all fortifications are castles.
I’ve often seen a further narrowing of the definition among medieval scholars, who often argue that to be a true castle, the structure must be from the European Middle Ages and be a fortified residence. This is why castles often have courtly rooms within them (like grand halls, bedrooms, chapels, etc.) beyond the storerooms, barracks, and defensive structures that their military purpose require.
I, of course, defer to the scholarly opinion in that definition — that a castle must be a medieval fortified residence. However, whether or not a castle’s owner continually lives there is actually less important for our purposes than the fact that a castle would be continually inhabited by someone loyal to its owner. A castle would not be left empty, whether or not anyone was sleeping in the master bedroom.
Eric Falden, “What Were Castles Actually For?”, Falden’s Forge, 2025-07-29.
November 4, 2025
QotD: What are Castles?
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