John David Fitzgerald of Dublin was the son of David Fitzgerald, a Dublin merchant. He was Member of Parliament for Ennis 1852-1860 and was appointed Attorney General in 1856. At the time of Griffith's Valuation he held land in the parish of Quin, barony of Bunratty Upper, county Clare and in the parish of Rathkeale, barony of Connello Lower, county Limerick. In 1860 he married as his second wife Jane Mary Matilda Southwell, sister of the 4th Viscount Southwell. In 1882 he was made a life peer as Baron Fitzgerald of Kilmarnock. In the 1870s he owned 1,393 acres in county Clare and 1,324 acres in county Limerick.