Citadel

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A citadel is a large fortress or castle that is usually built to protect cities or towns from attacks or disaster, though citadels have been built for other reasons as well. Citadels are often built to be the final protection for a city or town, in case enemies break through other protections such as walls or soldiers.

The citadel of a city is most often built around the center of administration and government, which is where the king or city council makes their rulings. Other common places for a citadel to be placed are the downtown (central core) of the city, the holy center or religious square of the city (many shrines), and the business or financial area, where money is traded for goods, and invested.