The di Rondòs’ spiritual leader and Biagio and Cosimo’s tutor. He’s an old, sleepy, and vacant man; Baron Arminio chose him mostly because the Abbé is a Jansenist and not a Jesuit. The Abbé is a poor caregiver and under his watch, the boys get away with all sorts of mischief. Later, after Cosimo climbs into the trees, the Abbé’s world begins to open up. Cosimo is able to convince him to sometimes climb into the trees for lessons, and the Abbé becomes very interested in Enlightenment ideas. When he starts ordering books by Enlightenment philosophers, however, higher-ups in the church arrest him. Biagio explains that Abbé Fauchelafleur dies unsure of what exactly he believes in, but trying his hardest to believe in something, nonetheless.