The Rothschild bank in Naples was founded following the Restoration of 1815, and thereafter played a major role in the financial affairs of the Kingdom of the Two Sicilies and other Italian states until Italy's Unification after which its operations were transferred to Turin and Rome in 1863. This article examines the career of Karl Rothschild and his son Adolphe in Naples, and describes their close contacts with the Neapolitan government, their intervention to finance the return of Pope Pius IX to Rome following the revolution of 1848–9, and their financial dealings with Cavour and the Kingdom of Piedmont-Savoy in the early 1850s. As well as contacts with the parent Rothschild banking operations in Frankfurt and London, the article examines the Rothschilds' relations with other foreign and local bankers in Naples. It also explores their role in Neapolitan society and their role in the re-establishment of the Jewish community in Naples in 1830, which they continued to watch with interest long after the family's banking interests in the city had been wound up.