- Born on March 12, 1749 in London
- Deceased on October 20, 1804 in Maynooth, at Carton House, at the age of 55 years
Parents
- James FitzGerald (1722 - 1773), Duke of Leinster
- Emilia Mary Lennox (1731 - 1814)
Family
- Married on November 7, 1775, with Emilia Olivia Usher (c. 1750 - 1798), issuing
- Emily Elizabeth (1778 - 1856)
- Isabella Charlotte (c. 1790 - 1868)
Occupations
- Member of Parliament for Dublin City (1767 - 1773)
- Member of Parliament for Kildare Borough – (1768 - 1769)
- grand master (1770 - 1772)
- grand master of the Grand Lodge of Ireland (1777 - 1778)
- Master of the Rolls in Ireland (1788 - 1789)
- clerk of the Crown and Hanaper (1795 - 1797)