1st Duke of Leinster was the son of Robert FitzGerald, 19th Earl of Kildare, and Lady Mary O'Brien daughter of 3rd Earl of Inchiquin .
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, thus becoming Premier Duke, Marquess and Earl in the Peerage of Ireland.
He was a member of the Irish House of Commons for Athyfrom 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 to the Duke of Richmonds daughter he was created Viscount Leinster, of Taplow in the County of Buckingham, in the Peerage of Great Britain. 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. He had Nineteen children .
1st Duke of Leinster was the son of Robert FitzGerald, 19th Earl of Kildare, and Lady Mary O'Brien daughter of 3rd Earl of Inchiquin .
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, thus becoming Premier Duke, Marquess and Earl in the Peerage of Ireland.
He was a member of the Irish House of Commons for Athyfrom 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 to the Duke of Richmonds daughter he was created Viscount Leinster, of Taplow in the County of Buckingham, in the Peerage of Great Britain. 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. He had Nineteen children .
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