The ancient Battle of Corrin—occurring 20 years after the end of the Butlerian Jihad—spawns the Padishah Emperors of House Corrino, who rule the known universe for millennia by controlling the brutally efficient military force known as the Imperial Sardaukar. Ten thousand years later, one balance to Imperial power is the assembly of noble houses called the Landsraad, which enforces the Great Convention's ban on the use of atomics against human targets. Though the power of the Corrinos is unrivaled by any individual House, they are in constant competition with each other for political power and stakes in the omnipresent CHOAM company, a directorship which controls the wealth of the entire Old Empire. The third primary power in the universe is the Spacing Guild, which monopolizes interstellar travel and banking. Mutated Guild Navigators use the spice drug melange to successfully navigate "folded space" and safely guide enormous heighliner starships from planet to planet instantaneously.