At the end of the 19th century, Florentine gentlemen used to meet in cafes for vermouth hour: a chilled glass of wine infused with botanicals. Since bitter was also in fashion, the custom of combining vermouth and bitter soon arrived, probably from the United States. Thus the Americano cocktail was created.
Let's take a step back in time and go to one of the most prestigious streets in Florence. Straddling via de 'Tornabuoni and via della Spada was the Casoni store. Inside, you could buy spices and sweets but also taste wines and liqueurs. It was frequented by Count Camillo Negroni, who often stopped to meet his friends for an aperitif prepared by his trusted barman, Fosco Scarselli. The story goes that one day sometime between 1917 and 1920, the Count asked Fosco to add gin to his Americano. From that moment on, he began to order his "usual", which was immediately requested by other customers and became known as 'Americano alla moda del Conte Negroni' or simply 'Negroni'.