fortress, stronghold, bastion; see castle, fortification 2.
"citadel." YourDictionary, n.d. Web. 22 March 2019. <https://thesaurus.yourdictionary.com/citadel>.
citadel. (n.d.). Retrieved March 22nd, 2019, from https://thesaurus.yourdictionary.com/citadel
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