BC and AD: What They Mean, Who Began Them and Why



  • BC means “before Christ” and AD is the Latin anno Domini, “in the year of the Lord”, so AD does not mean “after death”.
  • A sixth-century monk named Dionysius Exiguus began counting from the incarnation while he was continuing an Easter table, because he did not want to go on numbering the years from the persecutor Diocletian.
  • The count travelled slowly: Bede was using it by 731, and it was not general in Europe until after AD 1000.
  • There is no year zero, so to count across the line we add the two numbers together and take one away.
  • On the usual reckoning Jesus was born a few years before the year one, because he was born under Herod and Herod’s death is generally dated to 4 BC, though some scholars argue for 1 BC.
  • BCE and CE grew from the Latin “vulgar era” that the astronomer Kepler wrote of in 1615, and “Common Era” is first recorded in English in 1708.
  • Many Jewish writers use CE and BCE, and the columnist Philologos says for himself that he cannot be expected to call Jesus Lord in a date, while Albert Mohler and the Southern Baptists want BC and AD kept.

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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