How Did Mysterious Illnesses Affect the Reigns and Downfalls of Notorious Dictators Throughout History?

Throughout history, numerous dictators have ruled with an iron fist, but some of them were beset by mysterious ailments that overshadowed their reigns. These diseases often contributed to their downfall or shaped their decision-making processes. What makes these illnesses particularly intriguing is the often classified or speculative information surrounding them, as well as their potential impact on both the leaders themselves and the nations they governed.