Maurice FitzGerald, 4th Earl of Kildare (1318–1390), third and youngest son of the 2nd Earl
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After nearly a century as the headquarters of the Royal Dublin Society, which held its famed Spring Show and Horse Show in its grounds, Oireachtas Éireann, the two chamber parliament of the new Irish Free State, rented Leinster House in 1922 to be its temporary parliament house.
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In London on 3/4 August 1791, more than a year after her mother's death, Charlotte married Lord Henry FitzGerald, a member of the Duke of Leinster's family.
In April 1780, Tandy was expelled from the Dublin Volunteers (see Henry Flood) for proposing the expulsion of the Duke of Leinster.
William Russell Lane-Joynt (1855–1921, United Kingdom), Honorary Curator of the Duke of Leinster's collection at the Dublin Museum of Science and Art.
Thomas FitzGerald, Earl of Offaly (12 January 1974 – 9 May 1997) was the only son of Maurice FitzGerald, Marquess of Kildare (now 9th Duke of Leinster).
The original ZSI was founded in Dublin on 10 May 1830 at a meeting in the Rotunda Hospital called and chaired by the Duke of Leinster, "to form a collection of living animals on the plan to the Zoological Society of London".