Agar extensively rebuilt Gowran Castle and also acquired substantial interests in Dublin by marriage. He died in 1746: his widow remarried George Dunbar of County Fermanagh. She died in 1761.
Political control of the town of Callan, as well as the parliamentary seat of Gowran, passed to Henry's brother James Agar. This led to a bitter feud with the rival Flood faction, whose leader Henry Flood killed James in a duel in 1769.
^Leigh Rayment's historical List of Members of the Irish House of Commons. Cites: Johnston-Liik, Edith Mary (2002). The History of the Irish Parliament 1692-1800 (6 volumes). Ulster Historical Foundation.
^Rebecca Lyons, "Selling the collection of Welbore Ellis Agar" in Susanna Avery-Quash, Christian Huemer, eds., London and the Emergence of a European Art Market, 1780–1820 (Getty Publications, 6 August 2019), p. 176