Richese is the "fourth planet of Eridani A, classed with Ix as supreme in machine culture. Noted for miniaturization.
The Prelude to Dune series establishes that it is under the rule of the Count of House Richese, and is orbited by Korona, an artificial moon created for scientific and industrial research. This moon is later destroyed by the Padishah Emperor Shaddam IV when he discovers that it is the hiding place for an illegal hoard of melange.
In Hunters of Dune, Murbella of the New Sisterhood contracts Richese to build as many armed ships and as much weaponry as possible, in preparation for their pending confrontation with the unknown enemy. The Honored Matre forces on Tleilax subsequently incinerate the entire planet of Richese with Obliterators.
Read more about this topic: List Of Dune Planets