Caladan, later Dan, is the "third planet of Delta Pavonis" and the ancestral fiefdom of House Atreides. The Atreides live on Caladan for twenty-six generations in the ancient Castle Caladan prior to the events of Dune, and it is the home of Paul Atreides for fifteen years until the Atreides take up residence on Arrakis. The farming of pundi rice, supplemented by fishing and wine making, is the primary economic activity of Caladan. By the time of Heretics of Dune, its name has been shortened to "Dan."
Read more about this topic: List Of Dune Planets