6. The Priory of Sion 1956
The Priory of Sion has been characterized as anything from the most influential secret society in Western history to a modern Rosicrucian-esque group, but, ultimately, has been shown to be a hoax created in 1956 by Pierre Plantard, a pretender to the French throne. The evidence presented in support of its historical existence is not considered authentic or persuasive by established historians, academics, and universities, and the evidence was later discovered to have been forged and then planted in various locations around France by Plantard and his associates.
Between 1961 and 1984 Plantard contrived a mythical pedigree of the Priory of Sion claiming that it was the offshoot of the monastic order housed in the Abbey of Sion, which had been founded in the Kingdom of Jerusalem during the First Crusade and later absorbed by the Jesuits in 1617. Plantard hoped that the Priory of Sion would become an influential cryptopolitical irregular masonic lodge dedicated to the restoration of chivalry and monarchy, which would promote Plantard’s own claim to the throne of France.
The priory recently gained interest again (despite easily obtainable proof that it is a fake) through the publication of the book The Davinci Code which the author, Dan Brown, claims to be fact (proving that he lied outright about his alleged years of research for the book).
see Priory of Sion on Wikipedia