He is famous for his eccentricity, which he carried to his grave, literally. On his tombstone is a small raised platform roughly 8 inches long and 4 inches wide, that is said to depict a closed book. On the surface of the platform are 5 curious, raised letters that spell 31OXI. Most believe this refers to chapter 11, page 310 of his famous book, The True Celtic Language and the Cromlech of Rennes-les-Bains; a peculiar work that is said to contain codes and riddles which suggest that a hidden treasure or secret is preserved in the region. It also purports that a gigantic stone circle encircles the whole of Rennes-les-Bains. The book, like the code remains a mystery.
Abbe Boudet was ordained a priest on Christmas day, 1861. He served as a vicar in Durban in 1862, a town not far from Perillos, the alleged location of the true Gethsemane (the biblical setting for the passion of Christ) according to some researchers. He succeeded Abbe Jean Vie in Rennes Les Bains in 1872, a position he held until 1914. It is believed that Abbe Boudet inherited knowledge of a great secret from Abbe Jean Vie, who inherited it from Abbe Cauneille, who recieved it from Abbe Antoine Bigou. It is also believed that Abbe Boudet is responsible for having changed the date on Abbe Jean Vie's tombstone from 31 August 1872 to the mysterious, recurring date of 17 January.
Abbe Boudet was good friends with Abbe Saunière, the priest in nearby Rennes-Le-Château. The two were very close. Thus, it is likely that Abbe Boudet would have entrusted Abbe Sauniere with his secrets. Inexplicably, Abbe Boudet is known to have provided large sums of money to Abbe Saunière's housekeeper, Marie Denarnaud, and Archbishop Billiard, despite having died a poor man. The source of his apparent wealth, like that of his friend and colleague, Abbe Sauniere, remains a mystery.