When we closely examine history’s most impactful leaders, we often find common traits like boldness, eloquence, and creativity. But what about those characteristics that aren’t necessarily as celebrated?

Indeed, a more detailed appraisal reveals a darker side to the pinnacle of leadership attained by so few. Let’s take a look at these unforgettable leaders who have not only gone to battle to create their idea of a perfect polity, but also went to battle with themselves, internally waging war with mental illness:

Next, discover the history of mental illness through the ages. Then, check out five horrifying historical “cures” for mental illness.

Abraham Lincoln

Joseph Stalin

Martin Luther King, Jr.

Diana, Princess of Wales

Maria I of Portugal

Nero, Roman Emperor

Winston Churchill

Commodus, Roman Emperor

Lawton Chiles, Former Governor of Florida

John Curtin, 14th Prime Minister of Australia

Adolf Hitler

Donald Trump