Middle Ages Denialists. I shit you not:
The Phantom time hypothesis is a conspiracy theory developed by Heribert Illig (born 1947 in Vohenstrauß) in 1991. It proposes that there has been a systematic effort to make it appear that periods of history, specifically that of Europe during Early Middle Ages (AD 614–911) exist, when they do not. Illig believed that this was achieved through the alteration, misrepresentation and forgery of documentary and physical evidence.
Wow. (Via Nix over on Facebook.)