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Born Dec. 10, 1819, in Meldola; died Mar. 13, 1858, in Paris. Participant in the Italian Risorgimento. Member of the secret patriotic organization Young Italy (Giovine Italia).
In 1844, Orsini was sentenced in Rome to hard labor for life, but he was granted an amnesty and freed in July 1846. In the second half of 1846 and in 1847 he was active in the liberation movement in Florence. During the 1848–49 revolution he served as a volunteer in the war of independence against Austria and took part in the defense of Venice. He was a deputy in the Rome constituent assembly and a commissioner of the Roman republic in Terracina, Ancona, and Ascoli. In the 1850’s he lived abroad. He was involved in the conspiracies of Mazzini. Arrested by the Austrian authorities in 1854, he escaped from prison in 1856. Having chosen a path of individual terror, Orsini on Jan. 14, 1858, in Paris, threw a bomb at the carriage of Napoleon III, who supported the Italian reactionaries. With this act, he hoped to arouse the revolutionary forces of Europe and create conditions favorable to revolution in Italy. He was executed.