Series
There are 3 books in the Legends of Dune series.
Published between 2001 and 2003. The publication order differs from the reading order — both are below.
Set 10,000 years before the original Dune, this prequel chronicles humanity's galaxy-spanning war against the thinking machines and the tyrannical AI Omnius. Brian Herbert and Kevin J. Anderson explore the origins of the Bene Gesserit, the Mentats, and the great houses, showing how the jihad against
All 3 books total 2,195 pages.
The Books Oracle — track the series you are partway through, and see what to read next.