The Treaty of Casalanza, which ended the Neapolitan War, was signed on 20 May 1815 between the pro-Napoleon Kingdom of Naples on the one hand and the Austrian Empire, as well as the Great Britain, on the other. The signature occurred in a patrician villa, owned by the Lanza family ("Casalanza" meaning "Lanza House" in Italian), in what is now the commune of Pastorano, Campania, southern Italy.