Phantom Time Hypothesis

The Phantom time hypothesis is a conspiracy theory developed in the 1980s and '90s by German publisher Heribert Illig (born 1947 in Vohenstrauß, Germany). The hypothesis proposes that periods of history, specifically that of Europe during the Early Middle Ages (AD 614–911), did not exist, and that there has been a systematic effort to cover up that fact. Illig believed that this was achieved through the alteration, misrepresentation and forgery of documentary and physical evidence

http://en.wikipedia.org/wiki/Phantom_time_hypothesis

Picture a mediæval-style ‘Man­hattan Project’ with scriptoria instead of hangars, and Gothic minuscule instead of maths. Holy Roman Emperor Otto III (980–1002) has engaged his theo­logians under the leadership of Gerbert d’Aurillac (later Pope Sylvester II) in a project that is among the most zealous and secretive of its kind since the facsimile houses of Alexandria were at their busiest. The gilding of narratives has many precedents in the writing of hist­ories, especially self-aggrandising ones. But the one described by the PTH takes this art of embellishment up a few more notches: more than two centuries worked up from scratch, then infiltrated into as many chronologies as possible. Only a Middle Gothic or a Byzantine fanatic could have taken it to such lengths. But it worked. And as the traces were destroyed, the histories reconfigured and rebound, no one was any the wiser. At least until Heribert Illig and his adherents apparently figured it out.

http://www.forteantimes.com/features/articles/5593/phantom_time.html

The New Chronology is a fringe theory regarded by the majority of the scientific community as pseudo-history, which argues that the conventional chronology of Middle Eastern and European history is fundamentally flawed, and that events attributed the civilizations of theRoman Empire, Ancient Greece and Ancient Egypt actually occurred during the Middle Ages, more than a thousand years later. The central concepts of the New Chronology are derived from the ideas of Russian scholar Nikolai Morozov (1854-1946),[1] although work by French scholar Jean Hardouin (1646-1729) can be viewed as an earlier predecessor.[2] However, the New Chronology is most commonly associated with Russian mathematician Anatoly Fomenko (b. 1945), although published works on the subject are actually a collaboration between Fomenko and several other mathematicians. The concept is most fully explained in History: Fiction or Science? which was written in Russianbut has been translated into English.

https://en.wikipedia.org/wiki/New_Chronology_%28Fomenko%29