"La Bouche de fer", the "Mouth of Iron", may have derived its name, sardonically, from Lucius Licinius Crassus's observation about the consul, Domitius, "that it was no wonder that a man who had a beard of brass, also had a mouth of iron and a heart of lead." Others hold that the name comes from a mailbox in the shape of a lion's mouth, located at the headquarters of the club, at No. 4, rue du Théâtre-Français, where letters, petitions, proposals, denunciations, screeds, and other treatises could be deposited. A third theory is that this name, "Mouth of Iron", was the same name as a lodge of freemasons to which Bonneville and Fauchet had once belonged.