MORENO, Mariano, Argentine lawyer, born in Buenos Ayres, 23 September, 1778; died at sea, 4 March, 1811. He studied law in the University of Buenos Ayres, and in the year 1800 finished his studies at Charcas or Chuquisaca, where he was graduated as doctor in law, and admitted to the bat'. In 1805 he returned to Buenos Ayres, where he presented a noteworthy memorial to the viceroy about free trade, and was appointed attorney of the audiencia. He took an active part in freeing the colony from Spanish rule, and was appointed on 25 May, 1810, secretary-general of the first governing junta. At the same time he was editor of "La Gaceta." He was the moving spirit of the junta, but, being an advocate of centralization, he was soon opposed by its president, Cornelio Saavedra, and, as he protested in vain against the admission of deputies from the interior states to the junta, he resigned on 18 December In January, 1811, he was appointed the first representative of the new nation to England, but died on his way thither.--His brother, Manuel, Argentine diplomatist, born in Buenos Ayres in 1781; died there in 1857. studied law in his native city, and had attained reputation at the bar when, in 1811, he was appointed secretary of legation in England, but; did not serve on account of the death of his brother. He remained two years in England, and after his return to his native country participated in the political events of 1815, and was banished to the United States, where he resided till 1821. On his return he was elected deputy to the junta de representantes, which place he occupied till 1826, when he became representative of the Provincia Oriental, or Uruguay, to 'the constituent congress, and was also secretary of foreign relations of the province of Buenos Ayres. In 1828 he was appointed minister plenipotentiary of the Argentine Federation to England, where he remained for more than eight years. On his return he was appointed librarian of the National library of Buenos Ayres, which post he held till his death. He wrote "Vida y memorias del Dr. Mariano Moreno, secre-tario de la junta de Buenos Ayres, con una idea sobre las revoluciones del Rio de la Plata, M6jico, Caracas, etc." (London, 1812; enlarged ed., 1836), which was translated into English. He was also the author of pamphlets on diplomatic questions.