BC means “before Christ”, and AD is the Latin anno Domini, “in the year of the Lord”. AD does not mean “after death”: the count starts from the coming of Jesus into the world, and if it started from his death, the years he spent among us would belong to neither side of the line. The man who set the count going was a sixth-century monk named Dionysius, and all he was trying to do was work out the date…

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