Title: What is a historical bias? - Quora
Headings: 
What is a historical bias?
Content: First of all, history is not written by the victors. History is written by whoever has a method of recording events. The secluded monasteries that the Danes sacked and looted during the Viking Age were the “losers”, and yet they were the ones who recorded early Viking raids on England. The Mongols defeated several of the Rus’ princes at the Battle of the Kalka River in 1223 and later subjugated many of the Rus’ principalities, and yet much of the information we have on the Mongol Invasion of Eastern Europe comes from Rus’ chroniclers. You’ll probably notice that the “victors” in those two examp
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First of all, history is not written by the victors. History is written by whoever has a method of recording events. The secluded monasteries that the Danes sacked and looted during the Viking Age were the “losers”, and yet they were the ones who recorded early Viking raids on England. The Mongols defeated several of the Rus’ princes at the Battle of the Kalka River in 1223 and later subjugated many of the Rus’ principalities, and yet much of the information we have on the Mongol Invasion of Eastern Europe comes from Rus’ chroniclers. You’ll probably notice that the “victors” in those two examples are traditionally portrayed as murderous barbarians. That’s partially because much of the accounts of those events often come from the “losers”.