However, placing the AD after the year number (as in "2011 AD") is also becoming common usage.
The Jewish historian Josephus, in his Antiquities of the Jews (ca.
AD 93), indicates that Cyrenius/Quirinius' governorship of Syria began in AD 6, and that the census occurred sometime between AD 6—7,.
Alternatively, the secular abbreviations CE and BCE are used, respectively.
There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC.
The Annunciation style also caused a major problem: in some years, there was no Easter, and in other years, that feast was celebrated twice; for example, Easter occurred on 23 March 1504 (i.e.
in 1505 for us) and on 12 April 1506, but not in 1505., and say that those who accept the story of the Massacre of the Innocents sometimes associate the star that led the Biblical Magi with the planetary conjunction of 15 September 7 BC or Halley's comet of 12 BC (less likely since comets were usually considered bad omens); even historians who do not accept the Massacre accept the birth under Herod as a tradition older than the written gospels.
On the continent of Europe, Anno Domini was introduced as the era of choice of the Carolingian Renaissance by Alcuin.
Its endorsement by Emperor Charlemagne and his successors popularizing the usage of the epoch and spreading it throughout the Carolingian Empire ultimately lies at the core of the system's prevalence.
The Anno Domini dating system was devised in 525 by Dionysius Exiguus to enumerate the years in his Easter table.
His system was to replace the Diocletian era that had been used in an old Easter table because he did not wish to continue the memory of a tyrant who persecuted Christians.
When the reckoning from Jesus' incarnation started replacing the previous dating systems in western Europe, different people chose different Christian feast days to begin the year: Christmas, Annunciation, or Easter.