All of the facts relevant to the d’Hautpoul family and their connection to the Knights Templar are real. As detailed in chapter 20, the abbé Bigou was Marie’s confessor and did in fact commission her gravestone ten years after her death. He likewise fled Rennes in 1793 and never returned. Whether he actually left behind secret messages is conjecture (all part of the Rennes lure), but the possibility does make for an intriguing story.
