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On 13 July 1817, Nicholas married Charlotte of Prussia ( 1798 – 1860 ), who thereafter went by the name Alexandra Feodorovna.
Charlotte was daughter of Frederick William III of Prussia and Louise of Mecklenburg-Strelitz.
Nicholas and Charlotte were third cousins, as they were both great-great-grandchildren of Frederick William I of Prussia. Emperor Alexander II, born 17 April 1818, successor of father Nicholas I, assassinated 13 March 1881, married 1841, Marie of Hesse and by Rhine

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