Make your roman empire rule the world sounds very complicated for a time before advanced travel or maybe do an Alexander the great effect which is basically ruling the [u][i][b]known [/b][/i][/u]world I think would be better but if its world conquest you might need to bump a little the tech tree. 

[quote]the NRP community on this site at least is pretty close/small (or even insular).[/quote]
[@ClocktowerEchos]

Yeah, this is pretty much a fact even people who just go off for most of the time know each other somewhat...