The Devil of Rennes-le-Château) but I forgot!
About 50 km west of Rennes-le-Château, Montségur is a mountain fortress in the historic region of Languedoc. The site is famous as one of the last strongholds of the Cathars, a mediaeval religious sect who practiced a variant form of Christianity that was linked to Gnosticism. The Cathars became so firmly rooted in Languedoc that a crusade (called the Albigensian crusade) was launched against them. In March 1244, after a long siege, Montségur finally fell to the forces of the French king -- who promptly reduced the fortress to rubble (the castle visible in the picture dates from several hundred years later).
In their book Mysteries and Secrets of the Templars (2005), Lionel and Patricia Fanthorpe state that the Cathars were offered a stark choice shortly before the fall of Montségur: "Provided that no-one left the fortress or attempted to take anything away from it, the garrison could more or less go home quietly as if nothing had happened -- but if anyone attempted to leave prematurely, they would all be burned." Instead of taking the first option, the Cathars elected to go with the second! During the night, a small group was lowered down the cliff face carrying something described as pecuniam infinitam - Latin for "infinite wealth". As a result, over two hundred Cathars were burnt alive. So the "pecuniam infinitam" must have been pretty valuable if it was worth that price! The Fanthorpes speculate that it may have been the Emerald Tablet of the alchemists, the Ark of the Covenant, or the Holy Grail.
In October 2004, when the manuscript of Mysteries and Secrets of the Templars was still in draft form, Lionel Fanthorpe gave a sneak preview of it at that year's Fortean Times UnConvention. At a time when Dan Brown's The Da Vinci Code was making headlines, Lionel's talk was a real scoop for the event -- in effect the keynote speech. Then 18 months later, after the book had been published, Fortean Times covered it in their review section (FT211:62). It was one of the worst reviews I've ever seen! The book received a score of 2 out of 10, and was described as a "deeply cynical exercise" and "a dishonourable crock of a book". There's gratitude for you!