thumb|In this seventeenth-century plan of the fortified city of Casale Monferrato the citadel is the large star-shaped structure on the left.
A citadel is a fortress or heavily fortified structure built within or near a city to serve as a stronghold for defense. In military history, citadels were important because they provided secure positions from which defenders could protect a city and maintain control during sieges or attacks.
AI-generated from the Wikipedia summary — may contain errors.
thumb|In this seventeenth-century plan of the fortified city of Casale Monferrato the citadel is the large star-shaped structure on the left.
A citadel is the most fortified area of a town or city. It may be a castle, fortress, or fortified center. The term is a diminutive of city, meaning "little city", because it is a smaller part of the city of which it is the defensive core.
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