Maria Antonia had the highest coefficient of inbreeding in the House of Habsburg, 0.3053:[6] her father was her mother's maternal uncle and paternal first cousin once removed, and her maternal grandparents were also uncle and niece. Her coefficient was higher than that of a child born to a parent and offspring, or brother and sister.[6]
Since her childhood, Maria Antonia was an intelligent and cultivated girl, sharing her parents' passion for music.[citation needed]
The last Habsburg king of Spain, Charles II, never fathered any children, due to his severe deformities and illnesses. According to the laws of succession in Spain, Maria Antonia would have had the right to inherit the crown had she lived long enough, because she was the only surviving child of Empress Margaret Theresa, Charles II's sister. During her childhood, it was decided that she would marry her maternal uncle, Charles II,[7] but this plan came to nothing due to political circumstances.[8][9]
As an alternative, she became a candidate for marriage to Victor Amadeus II, the Duke of Savoy, but nothing came of these plans either.
Electress
Maria Antonia finally married Maximilian II, the Elector of Bavaria,[10][11] on 15 July 1685 in Vienna. The marriage between an heiress of the Spanish throne, in Maria Anna of Austria, Queen of Spain's view, gave the Bavarian Wittelsbachs the closer place in succession to the Crown than the Austrian Habsburg. Mariana's dynastic loyalty was to her daughter Margaret Theresa of Spain's descendants, which were her granddaughter Maria Antonia and her family.[12][13] This put her at odds with her younger brother Leopold I, who wanted his son to be the heir instead of Maria Antonia, his daughter.[14] In an attempt to strengthen the claim of his son, Emperor Leopold I had his daughter waive her inheritance rights shortly after her marriage.[15][16][17] In exchange, he promised to have his son-in-law appointed as governor of the Spanish Netherlands.[18]
The marriage was very unhappy,[16] as the extroverted Maximilian and the introverted and serious Maria Antonia had little in common. Maria Antonia was reportedly offended by Maximilian's constant infidelity. When he was appointed governor of the Spanish Netherlands and left for Brussels in the company of his mistress Countess Canozza, Maria Antonia left for her father in Vienna to give birth, and it was widely assumed that she did not intend to return to Maximilian. She died of postpartum infections after childbirth.
As the niece of Charles II of Spain, Maria Antonia was of great relevance in connection with the succession to the Spanish throne,[19] which was a major political issue in late-17th-century Europe. One of her sons, Joseph Ferdinand, was of central importance to European politics at the end of the seventeenth century as a claimant to the throne of Spain.[10][12] Maria Antonia was the last of the Habsburg line in that country and Joseph Ferdinand's death before that of Charles II, the last Habsburg king of Spain, helped to trigger the War of the Spanish Succession.[20] If he had survived Charles, the European powers might have permitted him to accede to the throne of Spain under the terms of the 1698 Treaty of The Hague.[21][22]
Issue
Leopold Ferdinand of Bavaria (22 May 1689) – died at birth
Anton of Bavaria (19 November 1690) – died at birth
Generations are numbered by male-line descent from Frederick III, Holy Roman Emperor. Later generations are included although Austrian titles of nobility were abolished and outlawed in 1919.