I know this may sound really stupid...
But what does your mod do?
I was hoping to find a mod that started earlier than the default game, and the ending date was later too.
But also included different units and possibly buildings for the extra years put in (so, say you start in the year 1100, you have units from that time (and possibly buildings too).
I was advised to look into this, but couldnt find anything (I'd download the mod, but I have a limited amount of space things I can download, and I think I'm near the limit for this month, so I'll have to download next month...)