The Navis Nobilite is an ancient organisation of mutant Terran nobility predating even the creation of the Imperium of Man by several thousand standard years. It is comprised of noble families who are all human mutants called Navigators who have the unique psychic ability to navigate spacecraft through long distances in the chaotic transdimensional eddies of the Warp. The Great Houses of the Navis Nobilite are some of the wealthiest and most politically powerful collections of nobles in the Imperium.