Falsified Antiquity - Slight corrections between 130 BC and 911 AD

Art historian Dr. Illig recognized, that 297 years between 614 and 911 AD - in Europe - are invented. An error occurred when the calendar was changed in 1582. That would mean: Charlesmagne never existed. I thought years 500 - 800 AD were illogical. Is the following correct? If you push back the dates of early Islam 297 years, then Roman Empire was destroyed in a different way. The possible establishment of Islam in 325 AD may have been covered up in order to save Constantine's honor and win Vikings and Russians to Christianity.
Was March 1st in 130 BC the beginning of spring? Attalos is coded in the Hatto window in Mainz: SAL HATTHO. 2 Trapezoids (Rome, Langres, Fulda, 33 Roman Leagues) connect Hatto in the 10th with Attalus in 6th centuries.