Terenzio Della Rovere Mamini, count, an Italian philosopher, born in Pesaro about 1800. He received a superior education, and in 1831 took part in the revolutionary movement in the Romagna, and was proscribed. He took refuge in Paris, where he was occupied in literary labors until he was permitted to return to Italy by the amnesty granted in 1846 by Pius IX. He became prominent among the liberal statesmen who gathered around the pope, and accepted a place in the administration. The vacillating policy of Pius IX., however, soon led to his retirement, and he went to Turin, where with Gioberti and others he founded a patriotic society, of which he became president. In November, 1848, after the flight of the pope to Gaeta, he returned to Rome and became minister of foreign affairs; but he soon retired in consequence of the predominance of the ultra-republican element, and also resigned his seat in the constituent assembly. After the restoration of the papal power in 1849 he went to Piedmont, and subsequently became professor of philosophy in the Turin university, and a member of parliament. He warmly supported the policy of Cavour, and in I860 was appointed minister of public instruction.

From 1801 to 1865 he was minister at Athens. In 1866 he was accredited to Switzerland, but soon afterward became a member of the Italian senate. In 1870 he was restored to the chair of the philosophy of history in the Sapienza college at Rome, which he had formerly held. He is prominent among Italian ontologists. In his earliest philosophical work, Del rinnovamento dell antica filosofia italiana (1834), he adhered to the doctrine of empiricism based on psychological investigation. But he soon became a convert to Rosmini's opinion that the experimental method alone cannot philosophically reconstruct the science of nature and mind; and in his Discorso sull' ontologia e sul metodo (1841), and DlalogM di scienza prima (1846), he strove to find a philosophical basis in common sense, and expressed for the first time his doctrine of immediate perception as the only foundation of a full insight into reality. This last phase of his doctrine is expounded in his Oonfesaioni di un metafisico (1865), which is divided into two parts, respectively relating to ontology and cosmology. -A complete edition of his poetical works was published by M. Lemonnier (Florence, 1857). An English translation of his Princi-pii della filosofia del diritto ("Rights of Nations"), edited by Roger Acton, was published in London in 1860. Among his later works;ire:

Rinascimento cattolico (1862); Saggi di filosofia civile (1865); Meditazioni cariesiane (1868); and Teoria della religione e dello stato, e del suoi rapporti speciali con Roma e colli nazioni cattoliche (1868). He also contributes largely to the philosophical review La Filosofia delle Scuole italiane.