sentences:  Alexandra was born at her parents' palace at Embarkment, 2 in St. Petersburg on , as Duchess Alexandra Frederika Wilhelmina of Oldenburg.She was the eldest of the eight children of Duke Peter of Oldenburg and his wife Princess Therese of Nassau-Weilburg, half-sister of Sofia of Nassau, queen consort of Oscar II of Sweden.Alexandra belonged to the House of Holstein-Gottorp but grew up in Russia, where her family was closely related to the Romanov dynasty.