This bias can come as a result of the historian's thoughts towards the person or subject he is writing. The historian, for example, may choose to neglect all the bad actions of a particular person or the bad outcomes of a certain event, and only focus on the 'good' part.
So how do we know right from wrong? Facts can be checked to some extent, but going completely through every bit of the past seems improbable and impossible. The facts you get to learn also depends upon where you come from. Say, if a particular person has a very good position or status ion your country, their mistakes will either be looked at or won't be present in your history books in the first place.
Also See: https://www.visualistan.com/2016/10/personality-types-of-successful-people.html
Let us shed light on the dark side of some of the most famous personalities, the list contains many names. What's shocking is that the list even contains the name of Aristotle, the famous Greek philosopher. While Aristotle is widely appreciated for his philosophies and thinking in the Western world and even amongst many other people, the way he classified human beings according to their apparent differences, still sparks up a debate. For example, he considered women to be inferior lot. Similarly, there are others in the list as well.
The infographic below introduces us to the dark side of other famous historical personalities:
Infographic by: myfamilysilver
