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.