http://www.taleworlds.com/
Mount & Blade
Non-fantasy medievil times RPG with a focus on mounted combat.
This game is still currently under development, however they have a stable working version beta up for free on their site. However you can only play to level 7 unless you buy the game. If you buy it now you pay less than what it will cost at retail. Even though it is still isn't finished it is pretty awesome.
The graphics are dated and sound/music leaves something to be desired. But it is being devopled by an independant company so that is understandable. What sets this game apart for me is the mounted combat. It is done very well.
CHECK IT OUT.