Gilbertus Albans founded The Order of Mentats.
Behind the Scenes
Gilbertus Albans made his first appearance in The Dune Encyclopedia, and some time after he was quoted by Duncan Idaho in Chapterhouse: Dune. This fact placed Gilbertus Albans as the founder of the Mentats at Canon status, and his history, told us by the Encyclopedia, probably as truth.
However it isn't known whether Albans was created by Frank Herbert and added later to his novel, or was he originally developed by Frank, who gave the information about Albans to be inserted in The Dune Encyclopedia.
- Chapterhouse: Dune (Mentioned only)