History was written by liars! Every single piece of information written which has any historical content was written by someone who was fabricating!
Do I have your attention yet? :-) Well, before you send a lynch mob, let me offer some thoughts. Consider the following.
Most historical information was written by people who WERE NOT THERE when the event happened. There are people who write about history and make a concerted effort to slant the information in a certain direction, which is obviously a lie. But even among the honest and fair historians, information writen is based upon the information gained from the records of others--both people who were there and other writers who were not there. Hence, the information written is not necessarily the truth. It may be or it may not be. The writer/historian may be scrupulously careful and honest, but the work is only as correct as the information upon which it is based.
And what about the people who were actually AT THE EVENT? Behavioral science research into eye witness testimony in court suggests that one has to be careful about eye witnesses. Five people may see the same event, but the court may get five different (even if slightly different) stories.
So, maybe my statement is too strong; that history is written by "liars," but you get my point. Just because an historical account was carefully researched and written does not mean one can hang his or her hat on the opinions and finding given therein.