Gibbon has

A Problem 

with dates and calendars.  He writes, “Forty-six years after the flight of Mahomet from Mecca, his disciples appeared in arms under the walls of Constantinople.” That would be 668.  “In this inquiry I shall unfold the events that rescued our ancestors of Britain, and our neighbours of Gaul, from the civil and religious yoke of the Koran;” Gibbon introduces the threat of Islam.  His 46 years become very interesting when you consider other calendars.  

Watch for more pieces that fit.  Blessed is the one who looks.
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