Burke's Landed Gentry of Ireland (1904) records Thomas Dennehy of Belleview, Fermoy, county Cork and his two sons, John of Brook Lodge and Richard of Prospect House, Innishannon, county Cork. The eldest son John married Maria, daughter of Patrick Moriarty of Castledrum and Glencar, county Kerry and their eldest son was Major General Sir Thomas Dennehy who had a distinguished military career in India. John Denehy held land in the parish of Clondulane, barony of Condons and Clangibbon and Thomas Dennehy held land in the parish of Ardnageehy, barony of Barrymore, county Cork, in the mid 19th century. In February 1867 the estate of Thomas Dennehy, Hugh Morrow and Daniel Dennehy, amounting to over 1,500 acres in the barony of Barrymore and at Belview in the barony of Condons and Clangibbon, was advertised for sale. Various members of the Dennehy family owned land in county Cork in the 1870s. The largest acreage 277 acres was held by Maria Dennehy of Brook Lodge, Fermoy.