O'Brien (Carrigallen)
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Acheson O'Brien of Drumsilla was High Sheriff of Leitrim in 1810. In 1852 and 1853 over 2000 acres of the estate of Acheson O'Brien, leased from the Bishop of Kilmore, were offered for sale in the Encumbered Estates Court. The estate of William A. O'Brien of Drumsilla amounted to over 1400 acres in county Leitrim in the 1870s. In 1906 the representatives of William A. O'Brien were the owners of over 100 acres of untenanted land at Carrigallen as well as the mansion house at Drumsillagh.
At the time of Griffith’s Valuation Robert O’Brien of Rockfield held some land in the parishes of Killinagh and Killashandra, county Cavan. In 1876, Robert Francis O’Brien of Killeshandra, owned 1,091 acres in the county Cavan. He was the youngest son of Acheson O’Brien of Drumsillagh. In 1854 Robert F. O’Brien married Eleanor S. Forde of Loughnaval, county Dublin, and they had six sons and one daughter.
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