"Grand Duchess Alexandra Pavlovna of Russia (Russian: Александра Павловна: 9 August 1783 [OS 29 July] at Tsarskoye Selo – 16 March 1801 in Buda) was a ...
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daughter of Emperor Paul I of Russia and sister of emperors Alexander I and Nicholas I. She married Archduke Joseph of Austria, Palatine (Governor) of Hungary. Her marriage was the only Romanov-Habsburg marital alliance that ever occurred." - (en.wikipedia.org 11.08.2021)