So after a ton of great comments posted yesterday about your favorite "when and where" for historical gaming (and keep 'em coming if you haven't thrown your vote in), the question then arises, what system would you use to play in your favorite time period? Extra points for answers that take into account any system's supplements that specifically deal with your favored historical setting, making use of that system that much easier and more fruitful.
I'll put one caveat in here - you can't pick D&D, or any one of it's descendants or retro-clones. D&D's a great family of systems and all, but so much of it's bulk is related to the fantastical - non-human races, supernatural abilities, magic-based classes, monsters, magical items, spells, etc. - that picking it for use in a purely historical, non-fantastical campaign setting seems inappropriate or, at best, inefficient to me.
However, I'll caveat the caveat and give some wiggle room for the AD&D2E-Era "green books"; the historical supplements for Glory of Rome, A Mighty Fortress, etc.. If you want to use D&D and figure in one of these supplements , I'll buy into it.
So, let's hear your top pairing of favorite historical time and place with the most appropriate RPG.