A Date 

Edward Gibbon used to mark the first attack on Constantinople by the Arabs.  More precisely he had it “Forty-six years after the flight of Mahomet from Mecca“.  That year was 622.   If he had used an Islamic calendar converter, it would have calculated 666.  Most versions of the bible “calculate the number”. 
Watch for more pieces that fit.  Blessed is the one who looks.
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