Poritrin is the "third planet of Epsilon Alangue, considered by many Zensunni Wanderers as their planet of origin, although clues in their language and mythology show far more ancient planetary roots."
The Legends of Dune series notes it as once being home to inventor Tio Holtzman and the proud Lord Bludd, and that it is severely devastated in several Buddislamic uprisings.
Read more about this topic: List Of Dune Planets