That seems like a big rubbish to me. Did they convince the entire world to do so? Did the arabs and the chinese, for instance, also decide to fabricate 300 years(and how did he come to the conclusion that it was exactly 297 years and how did he come to the years 614 and 911?)?
Oh, and wasn't it in the year 622 that the Hegira took place? Did they also fabricate Mohammad. If that's true, then the Islamic calendar only starts in the year 919. Amazingly, by this time the arabs were already masters of the middle east, north africa and most part of Iberia. Did this hapen from one day to the other? How does the author of these thesis explains the differences in the european geopolitics between the VII century and the X century?
I'd laso like to hear about China. I'm not any expert, but I'd like to hear from Knight-Dragon something about these 297 years.
Plus, I do not know about other places, but here the christian era only started to be used in official documents in the XIV century. Before the years were counted
ab urbe condita, ie, since the foundation of Rome. Was this calendar also shifted in 300 years?
And what about that "obscure" datation method, Carbon 14 they call it. Are all the labs that do the analysis also in this sort of world medieval conspiracy?
And finally (and decisive in my opinion), the oldest important historical event that we know the exact day it ocured is a battle that took place in the VI century BC between th lydians and the medes. During the battle, a fortunate event happened: a solar eclipse took place, and the armies ceased the fighting and a peace treaty was signed because the two kings thought that it was a sign from the Gods that they had gone too far. The historians knew more less the year, but thanks to astronomical calculations the day could be tracked and found out to be the 28th of May 585 BC. If 300 years of history had been made up, then they would find out that no eclipse had ocured in that place at that time period.
Check
here. It is the 9th paragraph.