pecialization, but with the passage of millennia his admonitions were ignored, most disastrously by Proctor Hiebines XI in 10054 He agreed with the Tleilaxu to supply thud- and fourth-rank Mentats for experiments aimed at achieving a genetic sub structure upon which to ground a streamlined Mentat training program Al though the plan was sold to Hiebines as a low-risk way of multiplying well-qualified Mentats, its ultimate result was the destruc tion of the order The Tleilaxu gained access to the secret Mentat programs but their products were utter failures-rebellious against Iheir masters, disloyal to the Order, and guilty of heinous miscalculations Tleilax Mentals, were worse than useless, causing the reputation of the Order to plunge and even reliable Mentats to be mistrusted From this catastrophe arose the fear of "Twisted Mentats " The Order of Mentats never regained its former prestige but htill enjoyed limited re spect in some sectors until the reign of Leto II During the first thousand years of that Emperor's reign his Fish Speakers and plan etary administrators systematically promoted Mentat-doubt This scheme, with Leto s oth er plasteel fisted policies, led to a dimm ished need for Mentats and greater public suspicion of their contributions Leto's aim appears to have been the gradual destruction of the Order, beginning by progressivel) weakening it his many Duncan Idahos were charged with surveillance of all known Mentat Advisors, lower ranking Mentats were required to register with planetary gov ernors and secure special permission to trav el between planets ihe Spacing Guild (fearing loss of its spice allowance) often refused even reasonable Mental requesls This harassment climaxed with the infamous report of Idaho 11736, which accused the Order of responsibilily for the disasters that befell many Houses Major at the end of Ihe Comno dynasty In carefully orchestrated horror at the report Lelo outlawed Menial training m 11745 Within mnetj years all known Mentats, including those in probationary training had died, and the Fish Speakers sealed the vacanl Order House on Tleilax for two hundred years The House was later reopened as a museum, but Leto did noi extend his toleration of Museum Fremen to allow the establishment of Museum Mentats Nevertheless, when the MENTAT ORGANIZATION 379 MENTAT ORGANIZATION public was permitted access to the House, no papers, manuals, or instructional guides were found among the records TO date, the only Mentat material found among the Rakis Hoard is a transcription of a mutilated, partial copy of the Menial Handbook There remains the possibility, never actually confirmed or denied, that the Bene Gessent had stolen the missing material to incorporate Mentat training into their own programs By an irony of history, Lett) II was once forced to rely on B 0 Reverend Mother Anteac, who, contrary to Lelo's order, was alleged to be a fully trained Mental Advisor In the last year of his life, Leto asked Anteac to undertake a journey to the planet Ix She died there without reporting to her Mother House either the nature or die result of that mission The irony is double if indeed Anteac a woman, was the last of the Mentals PF Further references: MENTAT ORGANIZATION, THUFIR HAWAT, PTTBR DE vRiES, Dondar Koofeeg, The Rite and Fall of the Order if Mentals 2 V (Centraha Johun University Press) MENTAT ORGANIZATION.