Gauls, Britons, and Germans. I've only started 3 or so serious campaigns in RTW, never got close to finishing any like I did in MTW (I only finished like 2 or 3, mods included but still played longer than RTW). 1 of those 3 was the Germans. Pretty fun, but the lack of variety in barbarian units in vanilla RTW turned me off. Actually, seeing EB's unit diversity kinda made me see RTW units as bland and uninteresting. Maybe that's why I was never able to get a campaign going. But now I know I'll be starting one from one of those 3 factions, and hell, maybe even Baktria. And I am also interested in pre-Islamic Arabia, I don't know why, not much information on the Internet though and I really don't know many books on the subject either so while Im interested in it, I'm not too well read in it either.