Eau de Cologne
In 1806, Jean Marie Joseph Farina, a grand-grand-nephew of Giovanni Maria Farina, opened a perfumery business in Paris that was later sold to Roger &amp; Gallet. That company now owns the rights to "Eau de Cologne extra vieille" in contrast to the "Original Eau de Cologne" from Cologne. Originally the water of Cologne was believed to have the power to ward off bubonic plague. By drinking the cologne the citrus oil scent would be exuded through the pores, repelling fleas. Much as flea shampoo for dogs can be based on citrus oils today.