Since the beginning of recorded time, history has been written by the "winners" (those societies and belief systems that conquered and survived). Despite an obvious bias in this accounting method, we still measure the "historical accuracy" of a given concept by examining how well it concurs with our existing historical record. Many historians now believe that in gauging the historical accuracy of a given concept, we should first ask ourselves a far deeper question: How historically accurate is history itself? (extracted from http://www.danbrown.com/novels/davinci_code/faqs.html)