Harman Blemerhassett, a victim of Aaron Burr's conspiracy, born in Hampshire, England, Oct. 8, 1764 or '65, died in the island of Guernsey, Feb. 1, 1831. He was of Irish descent, and was educated in the university of Dublin and called to the bar; but becoming discontented with the condition of Ireland, he sold his Irish estates for more than $100,000 and sailed for New York in 1797. After spending some time in studying the country, he purchased an island of 170 acres in the Ohio river, two miles below Parkersburg, on which he built a fine mansion and made all the embellishments which wealth and taste could supply. His home became widely known for its elegance and the culture which distinguished its inmates. Among the visitors to this beautiful retreat was Aaron Burr, who went there in 1805 to make the acquaintance of Blennerhassett. By his skilful address he soon enlisted him in his Mexican schemes, in the belief that the country was likely to be involved in war with Spain, and a fortune might easily be made by enterprise. Burr was to be emperor, and Blennerhassett a duke and ambassador to England. Blennerhassett invested largely in boats, provisions, arms, and ammunition.

He left his home and family and went to Kentucky, where being warned of Burr's real designs, he returned to the island greatly disheartened. However, through Burr's repeated solicitations, and the persuasions of his wife, who had now enlisted in the undertaking with her whole soul, he persisted. A proclamation against the scheme having been published by President Jefferson, Blennerhassett, who was in hourly expectation of being arrested, escaped from the island Dec. 10, and, managing to elude pursuit, joined Burr's flotilla at the mouth of the Cumberland river. He was afterward arrested and sent to Richmond for trial (1807); but the case against Burr resulting in acquittal, the other conspirators were discharged. Bankrupt in fortune and broken down in mind, Blennerhassett retired to Natchez. His island had been seized by creditors, everything upon it which could be converted into money had been sold at a ruinous sacrifice, and the beautiful grounds were used for the culture of hemp, the mansion being converted into a storehouse for the crops. In 1811 he endeavored to recover from Gov. Alston, Burr's son-in-law, $22,500, a balance of sonic $50,000, for which he al-l Alston was responsible. Unless this was paid he threatened to publish a book which he had prepared exposing the whole conspiracy.

He afterward bought 1,000 acres of land near Port Gibson, Mississippi, for a cotton plantation; but the war of 1812 prostrated all commercial enterprises. Becoming continually poorer, in 1819 he removed with his family to Montreal, where he practised law for a time. He sailed for Ireland in 1822, to prosecute a reversionary claim still existing there. In this he failed; nor did he meet with any success in his application for aid to the marquis of Anglesey, whom he had formerly known. He endeavored to procure employment from the government of Portugal, and from the South American republic of Colombia; projected some improvements in firearms; and tried to obtain a situation as companion to an infirm kinsman. During the later years of his life he was supported by a maiden sister, who had a small estate, which she left to his wife and children. - His wife, the daughter of Governor Agnew of the Isle of Man, was a woman of much talent. About 1822 she published a volume of poems, "The Deserted Isle," and in 1824 "The Widow of the Rock, and other Poems," which contain many fine passages. In 1842 she returned to America, and petitioned congress for a grant of money for the spoliation of her former home.

The petition was presented by Henry Clay, and a committee of the senate reported favorably upon it; but she died before the bill was acted upon, and was buried in New York by sisters of charity. - Blennerhassett had three sons, the youngest of whom, Joseph Lewis, became a lawyer in Missouri, and furnished the original documents for the "Blennerhassett Papers, with a Memoir," by William II. Safford (8vo, New York, 1864).