James FitzGerald, 1st Duke of Leinster
Overview
 
Lieutenant-General James FitzGerald, 1st Duke of Leinster, etc. PC (Ire)
Privy Council of Ireland
The Privy Council of Ireland was an institution of the Kingdom of Ireland until 31 December 1800 and of the United Kingdom of Great Britain and Ireland 1801-1922...

 (29 May 1722 – 19 November 1773), styled Lord Offaly until 1744 and known as The Earl of Kildare between 1744 and 1761 and as The Marquess of Kildare between 1761 and 1766, was an Irish nobleman, soldier and politician.
Leinster was the son of Robert FitzGerald, 19th Earl of Kildare
Robert FitzGerald, 19th Earl of Kildare
Robert FitzGerald, 19th Earl of Kildare PC , known as Robert FitzGerald until 1707, was an Irish peer.-Background:...

, and Lady Mary, daughter of William O'Brien, 3rd Earl of Inchiquin
William O'Brien, 3rd Earl of Inchiquin
William McWilliam O'Brien, 3rd Earl of Inchiquin PC was an Irish nobleman.-Life:William O'Brien was the son of William O'Brien, 2nd Earl of Inchiquin and Lady Margareth Boyle...

.
Leinster was a member of the Irish House of Commons
Irish House of Commons
The Irish House of Commons was the lower house of the Parliament of Ireland, that existed from 1297 until 1800. The upper house was the House of Lords...

 for Athy
Athy (Parliament of Ireland constituency)
Athy was a constituency represented in the Irish House of Commons to 1800. Following the Act of Union 1800 the borough was disenfranchised.-History:In the Patriot Parliament of 1689 summoned by King James II, Athy was represented with two members....

 from 1741 before succeeding his father as 20th Earl of Kildare in 1744.
 
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