Title: What is a historical bias? - Quora
Headings: 
What is a historical bias?
Content: Assuming so can be very dangerous, but that’s an answer for another question. With that out of the way, let’s answer your question. “ Since history is written by the victors, doesn’t this mean that history is intrinsically biased? ” No, because, as I’ve argued, history is not solely written by the victors. The results of a conflict does not automatically determine who gets to write about it. More often than not, you can get accounts from both sides. Sorry if I’m repeating myself, but we really need to get rid of this assumption. As far as history being inherently biased, then yes.** Every source is biased. Historians always have to keep this in mind.