AD means Anno Domini, Year of the Lord. So, the fact aside that there probably was a miscalculation, the year 1 AD was supposed to be Jesus' birthyear. It makes sense there is no year 0, because the year before 1 AD was the year before christ, 1 BC.
Read about glory and decline of the Seleucid Empire... (EB 1.1 AAR)
from Satalexton
from I of the Storm
from Vasiliyi
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