By the way Rare, I have a few questions to ask if you don't mind.

Is there a uniform timeline already used? I'm making my own historical measurement but I need something to compare it with.
And would you mind if I made a really influential monotheistic religion like Christianity?
Edit: Also would you mind if I made an abandoned city due west of my location which would serve as the former city of an Empire that once ruled over my current one? Like the ruins of Rome to my Constantinople.