Tula wooed Vorian’s great-great grandson Orry and killed him after murdering a score of other Atreides men. Tula then joined her Valya in the Sisterhood, where years later they came to rule it.

Orry is an Atreides, and Tula murders him. (Someone, perhaps Tula, has also killed the entire Atreides clan, save for a young teen she advises to run away.) On Wallach IX, Raquella has realized ...