Mount & Worlds

Mount & Blade is a medieval, single-player open-ended action role-playing video game for Windows developed by Turkish company TaleWorlds, and published by Paradox Interactive. Its retail version was released on September 16, 2008 in North America, and three days later in Europe. The game originated as an independent project of Armagan Yavuz, founder of TaleWorlds, and his wife, Ipek Yavuz. Prior to its retail release, beta versions of the game have been published on the developer's website.Mount&Blade is an action oriented role-playing game with emphasis on mounted combat. Unlike most other titles of the genre, the game contains no fantasy elements. It does not restrict the player to a certain storyline, but instead presents a sandbox medieval realm named Calradia, in which the player is given the ability to either join one of the five available battling factions, assume the role of an outlaw, or take a neutral side..
http://www.taleworlds.com/ is the main site of the game.