Here is an interesting Internet curiosity — The Grailhunter's Timeline 1944-2019, which chronicles "modern day authors and other researchers of the Knights Templar, Oak Island, Rennes-le-Château, The Da Vinci Code, the Gospel of Judas, Holy Blood, Holy Grail, the Shugborough Monument, the Newport Tower, Rosslyn Chapel, the Jesus Bloodline theory, and much more: year by year, often month by month, for the last fifty years."
It's put together by George Smart, who wrote a book called The Knights Templar Chronology. Mr. Smart, who evidently has a sense of humor, brags that the book sold "literally dozens of copies."
Oddly enough, although Mr. Smart mentions Dan Brown's The Da Vinci Code, he doesn't mention the first novel to cover these topics, The Widow's Son by Robert Anton Wilson. These topics also are covered in the essay "Mary, Mary, Quite Contrary," in RAW's rather good collection, Email to the Universe.