Narcissistic personality disorder (NPD) is a mental health condition in which people have an unreasonably high sense of their own importance. It's a condition that has afflicted some of the most recognized individuals in world history. And while many people demonstrate narcissistic traits (with some actually able to contribute positively towards society despite their condition), it's those whose NPD has gone hand in hand with more serious psychiatric disorders that history has recorded as being among the most dangerous and unpredictable ever to walk the planet.
Intrigued? Click through and discover those who only really cared for themselves.