According to the Phantom Time Hypothesis, Charlemagne never existed, along with 297 years that were just made up.
In a world where every idea seems divisive, it can help to know there are at least a few things that the world as a whole agrees on. Time, the calendar, and the basic idea that history as we know it happened pretty much like historians say it did are just a few of those things. I mean, after all, at the very least we can all agree that the year is 2017, right?
According to German Historian Heribert Illig the year is actually 1720, the Gregorian calendar is a lie, and a chunk of Middle Ages was completely made up.
No, this man is not crazy (at least not officially) and he actually claims to have archeological evidence to support his case.
In 1991, Illig proposed his theory, aptly called the Phantom Time Hypothesis. He claims there was conspiracy entered into back in 1000 AD to change the dating system by three world rulers.