SummaryBorn to a noble family in the Italian Trentino, Prati studied philosophy in Austria and Germany. Returning to Italy, he joined the carbonari, a network of revolutionary secret societies. Forced into exile in Switzerland, he worked as an educator alongside Pestalozzi. Following his expulsion from Switzerland, Prati sought refuge in Britain, becoming acquainted with Coleridge, the Benthamite utilitarians, and the Owenites. Following the July Revolution, Prati went to Paris, where he became a Saint-Simonian. Returning to Britain, he sought to convert (...) the British to Saint-Simonism, before undertaking a series of other literary projects. He eventually returned to Italy, where he entered into correspondence with the Roman Catholic philosopher Antonio Rosmini. Prati left behind him a trail of letters, newspaper articles, pamphlets, and books, written in four different European languages. These have been hitherto neglected by scholars, and constitute the basis of the current article. (shrink)