Charles I of Austria
Charles I or Karl I (Karl Franz Joseph Ludwig Hubert Georg Otto Maria; 17 August 18871 April 1922) was the last Emperor of Austria, the last King of Hungary (as Charles IV, ), the last King of Bohemia (as Charles III), and the last monarch belonging to the House of Habsburg-Lorraine. After his uncle Archduke Franz Ferdinand of Austria was assassinated in 1914, Charles became heir presumptive of Emperor Franz Josef. Charles I reigned from 1916 until 1918, when he "renounced participation" in state affairs, but did not abdicate. He spent the remaining years of his life attempting to restore the monarchy until his death in 1922. Beatified by Pope John Paul II in 2004, he is known to the Catholic Church as Blessed Karl of Austria.
Maria Antonia of Austria
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, but this plan came to nothing due to political circumstances.