Can I vote earth, with all of earth's history, for any variety of historical/realistic RPGs?
I'll agree on Forgotten Realms: it has great maps and a lot of fiction, but very little political detail, and political detail there is, is piecemeal.Definitely historical, but sometimes I'm not always so sure on the realistic part!
I'd agree with the aforementioned Forgotten Realms and Tekumel. I don't know if it would deserve first place, but I'd also put Kingdoms of Kalamar in the running.