Between Antiquity (1 AD) and the Renaissance (1500 AD) historians count approximately 300 years too many in their chronology. In other words: the Roman emperor Augustus really lived 1700 years ago instead of the conventionally assumed 2000 years.
However, the whole well-known historiography of the Middle Ages contradicts this assertion! The easiest way to understand doubts about the accepted chronology and ‘well-known’ history is to seriously systematize the problems of medieval research. This will lead us to detect a pattern which proves my thesis and gives reason to assume that a phantom period of approximately 300 years has been inserted between 600 AD to 900 AD, either by accident, by misinterpretation of documents or by deliberate falsification. This period and all events that are supposed to have happened therein never existed. Buildings and artifacts ascribed to this period really belong to other periods.
(Dr. Hans-Ulrich Niemitz)
The good doctor's paper can be read in full HERE.