The philosophers Will and Ariel Durant once wrote that history does not agree with our conceptions of good and bad; it defines good as that which survives, and bad as that which goes under. To drive their point home they declared, "the universe has no prejudice in favor of Christ as against Genghis Khan."
History is about controlling the present and preparing for the future through the manipulation of information about the past. Those who have control over information have the ability to alter events that have already technically happened. History, therefore, is a living battlefield where prejudices are declared and fought over.
The fact that we don't know what happened in the past is the only fact that we can truly rely on, and the fact that we don't know the past makes all histories inherently deceitful. In the words of Flaubert, " our ignorance of history causes us to slander our own times."