Charles O'Conor, an American lawyer, born in New York in 1804. Shortly before his birth his father emigrated from Ireland, and soon after his arrival lost a handsome property which he had inherited. This prevented the son from receiving a liberal education; but he learned at school the primary English branches, and received some instruction in Latin from his father, who also procured for him lessons in French. He studied law, and in 1824 was admitted to the bar. His first reported argument is in the case of Divver v. McLaughlan, in the supreme court in 1829. His chief cases are the slave Jack case (1835), the Lispenard will case (1843), the Forrest divorce case (1851), the Mason will ease (1853), the Lemmon slave case (1850), the Parish will case (1862), and the litigation concerning the Jumel estate; and he has been employed in many other important casus, some of which involved sums varying from $100,000 to millions. He was prominent in prosecuting the so-called " ring " cases against the late municipal officers of New York in 1873. A zealous democrat, he has been repeatedly urged by his party to accept nominations to the highest offices, but refused.

He consented to serve for 15 months as United States district attorney for New York under President Pierce, and was a member of the New York state constitutional conventions of 1846 and 1864. He was nominated for the presidency by the labor reform convention in Philadelphia, Aug. 22, 1<S72, and by the so-called straight-out democrats in Louisville, Kv., Sept. 3. He declined both nominations, but in the subsequent presidential election received 21,559 votes.