The vinegar of the 4 thieves
A bandage soaked in vinegar was placed around the forehead of Monatti, corpse carriers, to try and prevent them from being infected, as described by Manzoni. Four of them (somebody says seven), during the plague outbreak in Marseille in 1720, could sack the city scot-free thanks to the ablutions and gargles with aromatic vinegar, the ingredients of which were unknown to them.
Eventually they were sentenced to death for sacking and theft, but had their lives spared thanks to this vinegar, which was called the vinegar of the four thieves, after them. A French expert, Misette Godard, tried to prepare the vinegar of the four thieves based on the original recipe kept in Marseille and containing many herbs, cloves, camphor, wormwood and three pints of vinegar.