In addition to choosing whether to set our game on Arrakis or choose some wider scope, we also must decide on which era we wish to play. The Butlerian Jihad, as detailed in the
Legends Of Dune trilogy, takes place more than 10,000 years prior to the original novels. The Reconstruction, as detailed in the
Schools Of Dune trilogy, takes place just under a century after the end of the Jihad. Neither of these eras strike me as suitable periods for conducting a game.
Prelude To Dune takes place roughly a generation before the original novels and is a reasonable period for play. The
Dune rules roughly default to this era. There is however a 10,000-year gap between the events of
Schools Of Dune and
Prelude To Dune and that gives us much latitude to build an original campaign without overly concerning ourselves with canon.
Agents Of Dune and
Masters Of Dune could easily be set in this period or in the
Prelude default. Things change after Muad'Dib, and the God Emperor's rule changes
everything.