Dan Brown: 99 percent of it is true. All of the architecture, the art, the secret rituals, the history, all of that is true, the Gnostic gospels. All of that is … all that is fiction, of course, is that there's a Harvard symbologist named Robert Langdon, and all of his action is fictionalized.

Is The Da Vinci Code factual?

"The Da Vinci Code" is the fictional story of a conspiracy -- perpetrated by the Catholic Church and ongoing for 2,000 years -- to hide the truth about Jesus. Certain clues emerge through the works of Leonardo Da Vinci.

Is the Rose Line real?

Polished up for a supporting role in the film version of The Da Vinci Code, they played the fictional Rose Line. After that, Dan Brown's fans sought them out. They even looked for them at the Church of St. Sulpice, which figures in The Da Vinci Code but is not on the Paris Meridian.