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This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years after the start of this epoch, and BC denoting years before the start of the epoch.
C.) are designations used to label or number years used with the Julian and Gregorian calendars.
Tiberius began to reign with his father, Augustus, in AD 12.
The 15th year of his reign would then be 26 or 27 AD, placing Jesus' birth about 5 or 4 BC (because there is no year 0).
According to the Catholic Encyclopedia, popes continued to date documents according to regnal years for some time, but usage of AD gradually became more common in Roman Catholic countries from the 11th to the 14th centuries.
Eastern Orthodox countries only began to adopt AD instead of the Byzantine calendar in 1700 when Russia did so, with others adopting it in the 19th and 20th centuries.
Systems in use included consular dating, imperial regnal year dating, and Creation dating.
Even though Anno Domini was in widespread use by the 9th century, Before Christ (or its equivalent) did not become common until much later.
Bede used the expression "anno igitur ante incarnationem Dominicam" (before the Incarnation of the Lord) twice.
In this same history he also used another Latin term, "ante vero incarnationis dominicae tempus" ("the time before the Lord's true incarnation"), equivalent to the English "before Christ", to identify years before the first year of this era, even though he used zero in his computus.
Both Dionysius and Bede regarded Anno Domini as beginning at the incarnation of Jesus, but "the distinction between Incarnation and Nativity was not drawn until the late 9th century, when in some places the Incarnation epoch was identified with Christ's conception, i.e., the Annunciation on March 25" (Annunciation style).
The Anno Domini dating system was devised in 525 by Dionysius Exiguus to enumerate the years in his Easter table.