She was the eldest daughter of Victor Emmanuel, Duke of Aosta and his wife Maria Teresa of Austria-Este. Her father became King of Sardinia unexpectedly in 1802 when Charles Emmanuel IV abdicated. Ferdinand was the third son of Francis I, Holy Roman Emperor and Maria Theresa of Austria.
Maria Beatrice was the eldest daughter of Ercole III d"Este and Maria Theresa, Princess of Carrara.
Her maternal grandparents were Archduke Ferdinand of Austria-Este and Maria Beatrice Ricciarda d"Este. They fled to Parma, then Florence. They finally settled at Sardinia, the last dominion held by Kingdom of Sardinia, for refuge.
Maria Beatrice spent most of her time at Cagliari in later 13 years.
Maria Beatrice"s husband became Francis IV, Duke of Modena, Reggio, and Mirandola on 14 July 1814, making Maria Beatrice Duchess of Modena. Maria Theresa, Archduchess of Austria-Este (14 July 1817 – 25 March 1886), married Henri, Count of Chambord.
Francis V, Duke of Modena (1 June 1819 – 20 November 1875), married Princess Adelgunde of Bavaria. Archduchess Maria Beatrix of Austria-Este (13 February 1824 – 18 March 1906), married Juan, Count of Montizón.
The couple left Sardinia on 15 July 1813 for Zakynthos Island, and then sailed to Trieste off the east shore of Adriatic Sea, finally reached Vienna by land.
On the invasion of Joachim Murat during The Hundred Days, they fled Modena until 15 May 1815. Jacobite recognition
Upon the death of the abdicated King Charles Emmanuel IV on 6 October 1819, King Victor Emmanuel, father of Maria Beatrice, became the Jacobite heir, and Jacobites recognized her as "Princess Mary of England, Scotland, France and Ireland". With the death of her father on 10 January 1824, Maria Beatrice became recognized by Jacobites as rightful Queen of England, Scotland and Ireland as Mary III. Due to the outbreak of a revolution Maria Beatrice had to fled Modena again with her family on 5 February 1831, but with Austrian military help her family was able to return in the year.
Maria Beatrice died of a heart condition on 15 September 1840 at Castello del Catajo.
Her son Francis was the next Jacobite heir-general. Her remains were kept in the Chiesa di San Vincenzo in Modena.
Maria Beatrice was a Lady of the (Austrian) Order of the Starry Cross. Had she gained the throne she would have been Mary III & World War II
Titles and styles
6 December 1792 – 20 June 1812 Her Royal Highness Princess Maria Beatrice of Savoy
20 June 1812 – 14 July 1814 Her Imperial and Royal Highness Archduchess Maria Beatrice of Austria-Este
14 July 1814 – 15 September 1840 Her Imperial and Royal Highness The Duchess of Modena
Jacobite, 10 January 1824 - 15 September 1840 Her Majesty The Queen of England, Scotland, France and Ireland.
