The Italian doctrine of international law developed in the mid-nineteenth century, mainly under the influence of the historical events that characterized the so-called Risorgimento, the political process leading to the political unification and formation of the Kingdom of Italy in 1861. Several scholars largely based their writings on the theory developed by Pasquale Stanislao Mancini, according to which the principle of nationality was the basis for legitimacy and international subjectivity, a theory clearly linked with the political afflatus of the period. This chapter addresses the Italian scholarship of international law during the Risorgimento period, through a series of authors originally so strictly-linked with Mancini’s theories to be qualified, even at the time, as the ‘Italian school of international law’. Such theories were therefore firmly anchored in the Risorgimento, its political ideals and its historical evolution exercising a very significant impact on the international law studies in Italy during those decades.