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For specific structures, see Citadel (Cardassia) or the Yolja Citadel.

A citadel is a fortified building used for defense.

History and specifics[]

On the planet Agena IV, the city of the Machs was protected by a citadel. (TOS comic: "The Expansionist Syndrome")

On the planet Zaran II, the Zaran Totality's base was referred to as a citadel. (TOS novel: Triangle)

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