The older terminology for dividing time was AD and BC, the one meaning anno domini (in the year of our Lord) and the other meaning “before Christ.” All time in the western world has been looked at through this lens. In the last few years, some Christian scholars (and several non-Christian writers) have begun to use CE and BCE, which refer to the “Common Era” and “Before the Common Era” respectively.Such a perspective is not necessarily hostile to the Christian faith.Before AD/BC were used, Christian scribes either marked time from creation (or the birth of Adam or even Abraham) or from the ruling powers.Of course, if their assessment as to the beginning of creation was wrong, then that dating scheme is skewed.Thus, it is hardly new to use “common era” for “AD.” In AD 525 (or 525 CE), Dionysius Exiguus invented the anno Domini nomenclature.Two hundred years later, in 731, the Venerable Bede was the first to utilize both AD and BC.Rather, it simply does not affirm the explicitly Christian demarcations for time. First, it should be observed that AD/BC did not come into vogue until well into the fifteenth century, though by the ninth century AD was fairly popular (without an accompanying BC).
And reckoning time from the reign of a sovereign lacked universality.
Even if the ruler was an emperor, the calendar would typically start over with the next ruler.