15. Charles II of Spain: The Inbred King
Charles II of Spain inherited the throne deeply affected by generations of Habsburg inbreeding, resulting in profound physical and mental disabilities. He struggled to govern, often manipulated by courtiers, and was incapable of producing an heir or managing the empire’s affairs. Charles’s tragic reign hastened the collapse of the Spanish Habsburg dynasty, illustrating how unfit rulers—through no fault of their own—can accelerate national decline.
