is this for the martial artistry book you mentioned a while back?
as for the OP, i guess that depends by what you mean by "included in the game". if you mean the base rules, i think level up's/one dnd's approximate tech level (pretty solidly late medieval/early renaissance) is about right, at least in terms of providing options. if you mean in a setting, that obviously depends on what you're going for. i like the idea of early renaissance personally, but i've found i've got a soft spot for victoriana (thanks, zeitgeist).