A Calendar 

but which one applies?  The Gregorian started in 1582.  The Julian started in 44 BC. The Islamic started in 622, the year of the Hegira, 666 of the Julian calendar.  There is an Islamic calendar calculator and you get 666 if you enter 46.  Gibbon has Islam attacking Constantinople 46 years after the Hegira.  Does it really fit? 

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