The Carbonari was an informal network of secret revolutionary societies active in Italy from about 1800 to 1831. The Italian Carbonari may have further influenced other revolutionary groups in France, Portugal, Spain, Brazil, Uruguay, the Ottoman Empire, and Russia. Although their goals often had a patriotic and liberal basis, they lacked a clear immediate political agenda. They were a focus for those unhappy with the repressive political situation in Italy following 1815, especially in the south of the Italian Peninsula. Members of the Carbonari, and those influenced by them, took part in important events in the process of Italian unification, especially the failed Revolution of 1820, and in the further development of Italian nationalism. The chief purpose was to defeat tyranny and establish a constitutional government. In the north of Italy other groups, such as the Adelfia and the Filadelfia, were associate organizations.

The Kingdom of the Two Sicilies was a kingdom in Southern Italy from 1816 to 1861 under the control of a cadet branch of the Spanish Bourbons. The kingdom was the largest sovereign state by population and size in Italy before Italian unification, comprising Sicily and most of the area of today's Mezzogiorno in covering all of the Italian Peninsula south of the Papal States.