I wrote on The Long, Strange Career of ‘The Conjuring’ Demonologists Ed and Lorraine Warren.
Although they claim in interviews that they’d been at work for many years before, the Warrens begin popping up in press accounts in the 1970s. They describe themselves as artists who were also devout Catholics, and who had early on show talent for identifying and dealing with the supernatural. They started speaking publicly towards the end of the 1960s, usually during lecture tours of university campuses. Several of these are shown in the film itself, so that’s accurate. Often, they even spoke of the very case that inspired the plot of The Conjuring. Which is sort of funny, since one of the title cards in the film’s trailer claims this story was too disturbing for them to tell until now, but no one expects total truth-telling from film marketing, and it’s a relatively miniscule whopper.