Lieutenant-General James FitzGerald, 1st Duke of Leinster, PC (Ire) (29 May 1722 – 19 November 1773), styled Lord Offaly until 1743 and known as The Earl of Kildare between 1743 and 1761 and as The Marquess of Kildare between 1761 and 1766, was an Anglo-Irish nobleman, soldier and politician. Background Leinster was the son of Robert FitzGerald, 19th Earl of Kildare, and Lady Mary, daughter of William O'Brien, 3rd Earl of Inchiquin. Career Leinster was a member of the Irish House of Commons for Athy from 1741 before succeeding his father as 20th Earl of Kildare in 1743. He was sworn of the Irish Privy Council in 1746 and in 1747, on the occasion of his marriage (see below), he was created Viscount Leinster, of Taplow in the County of Buckingham, in the Peerage of Great Britain, and took his seat in the British House of Lords that same year. From 1749 to 1755 he was one of the leaders of the Popular Party in Ireland, and served as the country's Master-General of the Ordnance between 1758 and 1766, becoming Colonel of the Royal Irish Artillery in 1760. He was promoted to Major-General in 1761 and to Lieutenant-General in 1770. In 1761 Lord Kildare was created Earl of Offaly and Marquess of Kildare in the Peerage of Ireland and in 1766 he was further honoured when he was made Duke of Leinster, becoming by this time the Premier Duke, Marquess and Earl in the Peerage of Ireland. Family Leinster married the 15-year-old Lady Emily Lennox (6 October 1731 – London, 27 March 1814), daughter of Charles Lennox, 2nd Duke of Richmond and one of the famous Lennox Sisters, in London on 7 February 1747. She was a great-granddaughter of King Charles II and was therefore a distant fifth cousin of King George III (both of them were descended from King James VI and I). The couple had nineteen children: George FitzGerald, Earl of Offaly (15 January 1748 – Richmond House, 26 September 1765). William FitzGerald, 2nd Duke of Leinster (Arlington Place, Piccadilly, London, 12 March 1749 – Carton House, Kildare, 20 October 1804). Lady Caroline FitzGerald (1750 – 1754). Lady Emily Mary FitzGerald (15 March 1751 – 8 April 1818), married Charles Coote, 1st Earl of Bellomont and Baron Coote of Coolony. The couple had five children, one son who died young (born 1776) and four daughters. Emily died in