House Atreides had been one of the Great Houses within the galactic infrastructure of the Imperium. They were ruled by the patriarch of the Atreides family, who took the title of Duke. A rich history for the Atreides, as well as various other titles, including: the House of Pelops, and successively Lords of Tantalos, Counts of Thuestes, Counts of Aramanli,Counts Chalcedony, Siridar Counts of Hoosak Norn, in the Cleo System, Siridar Counts of Hestia, Dukes of Atreus, Siridar Dukes of Gallatin, Siridar Dukes of Caladan, Siridar Dukes of Arrakis, and Emperors of the Known Universe; junior titles include Barons Pelops, Barons Menelaus, Barons Aigisthos, Counts Atreides, Counts Gamnonides; distaff titles include Barons Mukenai, Lords Theseides, and Counts Delos.