Slovenian mixologist Kevin Kos prepared and tasted four different versions of the classic Negroni cocktail from three distinct periods, showcasing how the cocktail evolved over the 163 years since its invention. The earliest version from 1860 was known as the Milano-Torino, the second from 1919 was known as The Americano, and the final iteration as we know it. Kos also included his own favorite version. No matter the differences between the drinks, they all contained Campari.

Source https://laughingsquid.com/negroni-evolution/