Ipyr was a lush, green world; and the primary home-world of House Thorvald, which governed the planet as an Earldom in the Landsraad. During to the first rebellion against Emperor Paul Atreides Muad'Dib, from 10,194 AG to 10,198 AG; led by planetary ruler Memnon Thorvald, the planet was Thorvald's base of operations. When the Emperor found out about the Earl's upcoming expedition and strike against his former home planet of Caladan, Paul ordered Stilgar and his Jihadi Fremen to completely sterilize the planet and to render it lifeless, which Stilgar did in 10,198 AG.