It was first mixed in Florence, Italy, in 1919, at Caffè Casoni (formerly Caffè Giacosa), located on Via de' Tornabuoni and currently called Caffè Roberto Cavalli. Camillo Negroni concocted it by asking barman to build it up.
OR
It was first mixed in Florence, Italy, in 1919, at Caffè Casoni (formerly Caffè Giacosa), located on Via de' Tornabuoni and currently called Caffè Roberto Cavalli. Camillo Negroni concocted it by asking barman to build it up.