In Children of Dune (1976), Shaddam IV's third daughter Princess Wensicia plots from exile to assassinate Paul's twin children, Leto II and Ghanima, to retake control of the Empire for her son, Farad'n. Paul's mother Lady Jessica escapes a murder plot by her daughter Alia and travels to Salusa with Duncan Idaho; there she trains Farad'n in the Bene Gesserit ways in exchange for Wensicia's public banishment and the promise of his marriage to Ghanima.
Read more about this topic: Salusa Secundus