Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cytadela (Polish for Citadel) is a 19th-century fortress in Warsaw, Poland. It was built by order of Tsar Nicholas I after the suppression of the 1830 November Uprising in order to bolster imperial Russian control of the city. It served as a prison into the late 1930s.The Citadel was built by personal order of Tsar Nicholas I after the 1830 November Uprising. Its chief architect, Major General Ivan Dehn, used the plan of a fortress in Antwerp as the basis for his own plan. The cornerstone was laid by Field Marshal Ivan Paskevich, de facto viceroy of Congress Poland.

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