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This is were the pseudoscience begins, because he has to turn over a lot of what is known about the history of antiquity and the Middle Ages!
You mean like having the eruption of Vesuvius occur c. 1631 C.E. Which faces the problem of having Pliny the Younger's account, which was printed before 1631 in Western Europe. Copies of said editions still exist with the dates. So this eruption was described before it happenned!? No doubt this little problem is handeled by saying "forgery" and "fraud" over and over again.
Pierre