Already then Pierre Plantard (born March 18th, 1920) was a man with a questionable past. During World War II, he was an admirer of Adolf Hitler and had cheered the German invasion of his homeland. In the early 1950s, he was convicted of fraud and embezzlement, and spent some time in prison.
In 1956, Plantard founded the "Priory of Sion" - an association registered by the French authorities on May 7th, 1956 as an entity at Plantard´s request. Always in need of money, Plantard tried to bring his association into business with the congregation and with local authorities by running a school-bus line in conjunction with the church - but in vain. His club also published a periodical which soon ran out of funds. The "Priory of Sion" went out of business just three months after its foundation. But not forever...
Lincoln and his co-authors, Michael Baigent and Richard Leigh, produced a lengthy BBC TV documentary which was followed by their book "The Holy Blood and the Holy Grail" (U.S. title: "Holy Blood, Holy Grail") in 1982. A TV sequel, "The Messianic Legacy", followed in 1987.
Plantard died a convicted fraud and debunked hoaxer on February 3rd, 2000. But that did not stop others from re-narrating the myth he had invented.
In 2006, Baigent and Leigh sued Dan Brown, claiming that Brown had stolen entire chapters from "Holy Blood, Holy Grail" for his novel "The Da Vinci Code". A British court overruled their claim.