The interstellar governmental structure encompassing the Known Universe, established after the Butlerian Jihad under the rule of House Corrino. Power was distributed among three main pillars: the Emperor and his Sardaukar military, the Landsraad assembly of Great Houses, and CHOAM (the commercial combine controlling interstellar trade). The Spacing Guild provided the essential service of interstellar transport while maintaining strict political neutrality. This balance of power, codified in the Great Convention, maintained relative stability for over ten thousand years until the rise of Paul Muad'Dib.