Demetrios Atreides (d. 58 BG) was a junior officer serving under Sheuset Ecevit against the Landsraad, enlisted as a Sardaukar Auxiliary in the Sixth Draco Wing, representing Mockmuhl Cluster which could have been his homeweorld. During the Battle of Corrin, Demetrios was the gunnery officer on Lu-ta and after all the senior officers were killed early in the 3-day battle, he assumed command of the vessel. Historians claim that this action was the key turning point of the struggle and Atreides was ennobled as Baron Tantalos by Emperor Sheuset I. He was given large estates on Enskog in 86 BG.