The whole AD thing is a lot more recent than you might think.
For most of the time before that people kept time in terms of who was in charge.
The thought it was the xth year in the reign of King soandso.
This obviously was a bit troublesome since everyone had different rulers and leadership usually didn’t change hands on a schedule.
Dating methods that used epoch like xth years since y, like the one we used today existed, but weren’t the norm.
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