Marie Antoinette was born at Großharthau, Kingdom of Saxony, the first child of Sizzo, Prince of Schwarzburg (1860–1926), (son of Friedrich Günther, Prince of Schwarzburg-Rudolstadt and Countess Helena of Raina) and his wife, Princess Alexandra of Anhalt (1868–1958), (daughter of Frederick I, Duke of Anhalt and Princess Antoinette of Saxe-Altenburg). Through her mother she was descendant of King Frederick William II of Prussia.
Following her brother"s death in 1971 the became extinct in the male line. However the Schwarzburg principalities operated under Semi-Salic primogeniture, meaning in the event of the extinction of all male dynasts, as happened with the death of Prince Friedrich Günther, females can inherit. As such, Marie Antoinette became the head of the 7 February 1898 – 28 March 1909: Her Serene Highness Princess Marie Antoinette of Schwarzburg-Rudolstadt 28 March 1909 – 4 January 1925: Her Serene Highness Princess Marie Antoinette of Schwarzburg 4 January 1925 – 4 November 1984: Her Serene Highness The Countess of Solms-Wildenfels.
