Supporting this Theory

Despite some obvious downfalls, there's quite a lot of information supporting this theory.

One of the major contributors to this theory is the lack of architectural development throughout the Dark Ages (600-900AD). Roman architecture is said to have stopped developing earlier than possible, if it had continued as long as it is recorded to by popular history (27BC-476AD).

Another fault that lead to the belief that the timeline is incorrect is dendrochronology (counting of a tree's growth rings). They though that this was faulty as well as discrepancies with radio-carbon dating. These were only rumours as we cannot get accurate accounts.

There were discrepancies between the Julian calendar and Gregorian calendar when the Gregorian calendar was made. It was said that the Julian calender had been off by 13 days culminated by one day a century. The Gregorian Calendar had corrected this by only 10 days, so over the centuries, we had missed out 297 years of history, most notably seen as the Dark Ages, due to its lack of evidence.