the calendar change yes, the invention of Charlemagne, basically the dark ages are made up which is equivalent to a missing and/or fabricated 297 years . I am not completely convinced one way or the other, but it does come across quite interesting as a proposal, and given how many lies and fake history that is out there, it might be something else to consider.
Phantom time theory fits in here as well
the calendar change yes, the invention of Charlemagne, basically the dark ages are made up which is equivalent to a missing and/or fabricated 297 years . I am not completely convinced one way or the other, but it does come across quite interesting as a proposal, and given how many lies and fake history that is out there, it might be something else to consider.