[Freedom Dignity n Honor]

Well, to play the devil's advocate...maybe the powers that be didn't think they had to specify 0 A.D. Perhaps they assumed that everyone would know?

Is it possible to get one or more before none?

[discostu]

I think the “powers that be” didn’t really care much about declarations of decades and centuries and stuff like that. Chunk up history into blocks is something a people with a lifestyle of luxury get to do, subsistence farmers tend to be a little too busy staying alive to care what decade it is and why.