Burke's "Landed Gentry of Ireland" records the marriage of John Sullivan and Mary Herne of Hernsbrook, county Limerick in 1714 so the Aherns or Herns appear to have been established in that county early in the 18th century. In the mid 19th century Maurice Ahern owned the townland of Hernsbrook, 167 acres in the parish of Killeedy. He died in 1859 aged 88. In the 1870s Charles Ahern of Hernsbrook still owned the same acreage in county Limerick and an estate of 1,240 acres in county Cork. At the time of Griffith's Valuation Maurice Ahern held land in many parishes in county Cork including those in Cork city. A portion of the property known as the "Castle Farm of Monkstown" in the barony of Kerrycurrihy, county Cork, in the possession of Edmond Ahern, was offered for sale in the Landed Estates Court in February 1861.
- Landed Estates' Court Rentals (O'Brien), Ahern, 28 February 1861, Vol 61, MRGS 39/031, (microfilm copy in NUIG); National Archives of Ireland
Contemporary printed sources
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Barony of Glenquin, 48
- LEWIS, Samuel. ''A Topographical Dictionary of Ireland''. London: S. Lewis & Co., 1837: II, 136
- HUSSEY DE BURGH, U. H. ''The Landowners of Ireland. An alphabetical list of the owners of estates of 500 acres or £500 valuation and upwards in Ireland''. Dublin: Hodges, Foster and Figgis, 1878. [available online at www.askaboutireland.ie] : 4
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 116