Ultima Ratio Regum (Latin for the last argument of kings) is a roguelike created by Mark Johnson. It was started in 2011 and is intended to be a ten-year project. The game takes place in a procedurally generated world around the time of the scientific revolution. It is about "uncovering an intellectual conspiracy to rewrite history in the most culturally, religiously and socially detailed procedural world ever generated", and the game's core technical objective is "nothing short of the procedural generation of culture".