- The Trenchs of Garbally, county Galway, from whom the Heywood, county Laois branch are descended, bought lands in the baronies of Carra and Gallen, county Mayo, from the Brownes of Westport at the end of the 17th century. In 1833 the Trenchs of Heywood sold their county Mayo estate to Sir Compton Domvile of Templeogue and Santry, county Dublin, for £60,000. Sir C. Domvile had married Helen Sarah Trench of Heywood in 1815. Sir Frederick William Trench (1777-1859) of Heywood, an army officer and politican, owned a large estate in county Roscommon, in the parishes of Taghboy, Kiltoom, Kilmeane, Taghmaconnell and Dysart, barony of Athlone. When he died he left his Irish property to his eldest sister, the wife of Sir C. Domvile.
- The Domviles bought the county Mayo estate of the Trench family of Heywood, ,Queen's County [county Laois] in 1833. Following the death of Sir Frederick William Trench in 1859 the Domviles inherited his estate in county Roscommon. Sir Compton Domvile had married Helena Sarah, the eldest sister of Sir Frederick W. Trench, in 1815. At the time of Griffith's Valuation the Domvile estate was located mainly in the parishes of Manulla, barony of Carra, Killasser, barony of Gallen and Aghamore, barony of Clanmorris. Lands in county Tipperary, formerly the property of Christopher Domville, deceased, were sold in the Landed Estates Court in April 1863. The purchaser was Edward Egan. In December 1865 the county Roscommon estate of the Domviles amounting to 5779 acres in the baronies of Athlone and Moycarn was advertised for sale in the Landed Estates' Court. Most of it was purchased by the Waithmans. In 1876 the Domviles of Heywood, Abbeyleix, owned 6,040 acres in county Mayo and other estates in counties Dublin and Laois. By March 1916 the sale of the estate to the Congested Districts' Board had been accepted by the Domviles. The National Library holds a large collection of Domvile estate papers.