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Page 23. " He smells eau de Cologne. – He is in Cairo in the shop of Johann Maria Farina "

   Johann Maria Farina (1685-1766) was an Italian perfumer who founded the oldest perfume factory still in business in Cologne, Germany, as well as inventing the famous scent to which he gave the city's name.  His eau de Cologne was an enormous success, popular in the royal courts of numerous European nations throughout the 18th-century before finally being subsumed by a raft of imitations, its name entering common usage as a synonym for perfume in general.

Website of the Johann Maria Farina gegenüber dem Jülichs-Platz, perfume factory/museum founded in 1709