Welcome to Primisti!
The Primisti world has had its iterations through multiple rule systems over the years. The first campaign began with the AD&D rules, later campaigns followed using 2nd Ed D&D, Fantasy Hero and now D&D 3.5. Elements of the upcoming Pathfinder rules system may be incorporated in the future.
Primisti is a custom world that draws inspiration from a wide variety of sources in books, RPGs, Video Games and movies as well as fantasy campaigns by other Game Masters. Some of the Geography and History has changed over time to better represent the evolving game world.
The Primisti Wiki contains helpful info about the campaign world and the people and events that have shaped it.