Captain Harvey J.de Montmorency is recorded in Griffith's Valuation as holding the townlands of Cloongowla, parish of Ballinrobe, barony of Kilmaine and Ballindrehid, parish of Kilconduff, barony of Gallen, county Mayo. Cloongowla was previously part of the estate of George Ruttledge and Ballindrehid of the Knoxes of Castlereagh. A rental kept by John Hearn, agent for the estate, was published in the South Mayo Family Research Journal 1989. In the 1870s Frederick de Montmorency of Broughillstown House, Baltinglass, county Wicklow, owned 1,022 acres in county Mayo and 428 acres in county Carlow.
National Archives, UK:
De Montmorency Family of Inch House, Co Kilkenny, papers held privately, contact National Archives, Archives Sector Development, Kew, London, 19th-20th centuries. NRA 31521 Franks