Check out the chronology work done by Isaac Newton, Nosovski, AT Fomenko, and Gary Kasporov. The short version goes something like this: our basic idea of world historical chronology, ie, Ancient Greece is from 500BC, the Romans empire was established in 100BC, Egypt goes back x thousands of years, etc., is based on the work of two medival "historians" Scaliger and Petravius. No one has really done much correction of their work, and all the secondary and tertiary sources of history don't question their chronology. If you read their works, their methods were hardly scientific, they used numerology and astrology to come up with their timeline.
Newton and other scientists of his day believed that the "re-discovery" of "ancient Greece and Rome" during the Renassance were mostly forgeries and mythology made up in the middle ages, for various monetary and political reasons. Newton's work "The Origin of Monarchies" which is just now being published and released asserted this idea that 300 years were mistakenly added into the chronology. Some Russian and German mathmeticians are going much further, suggesting that perhaps up to 800 or so years of middle ages history is probably mythological, which would push dates for many things in history quite a bit forward.
The reaction by historians is hostile - in my opinion, they are acting like their religious beliefs are being questioned. At few historicans have made some noise about debunking these "nonsensical" theories, but so far, they are keeping awfully quiet about it. They will immediately point to C14 dating, but that doesn't prove their assertions, considering that c14 studies are "corrected" to fit into the accepted chronology. These theories have moved from Russian universities to Germany and Canada now. I expect to see a Discovery channel documentary any day now.
I do NOT defend all of the various sub-theories on this site, but this makes for a good introduction to the work being done on correcting our accepted chronology:
http://www.revisedhistory.orgWas Dante a historical character, or a political myth?
http://www.revisedhistory.org/dante.htm