7. Unfortunately, Charles Was Sterile
Though Maria Anna would become the Queen of Spain, she would hold very little power. Her primary job was to produce a male heir, but this task was something that she would not be able to do. No matter how many healthy boys had been born into her family, nothing could change the fact that Charles was sterile. After his death, his autopsy would reveal that he had only one testicle, and it was shriveled.