Augustus FitzRoy, 3rd Duke of Grafton

His Grace The Duke of Grafton KG PC
Portrait by Nathaniel Dance-Holland
Prime Minister of Great Britain
In office 14 October 1768 – 28 January 1770
Monarch	George III
Preceded by	The Earl of Chatham
Succeeded by	Lord North
Northern Secretary
In office 12 July 1765 – 14 May 1766
Prime Minister	The Marquess of Rockingham
Preceded by	The Earl of Halifax
Succeeded by	Henry Seymour Conway
Personal details
Born	Augustus Henry FitzRoy (1735-09-28)28 September 1735
Died	14 March 1811(1811-03-14) (aged 75) Euston, Suffolk, England
Resting place	St Genevieve Churchyard, Euston, Suffolk, England
Political party	Whig
Spouses	Anne Liddell ​ ​ (m. 1756; div. 1769)​ Elizabeth Wrottesley ​ ​ (m. 1769)​
Children	12; including George, William and John
Parent	Lord Augustus FitzRoy (father)
Alma mater	Peterhouse, Cambridge
Signature

Augustus Henry FitzRoy, 3rd Duke of Grafton, KG, PC (28 September 1735 – 14 March 1811), styled Earl of Euston between 1747 and 1757, was a British Whig statesman of the Georgian era. He is one of a handful of dukes who have served as prime minister.

He became prime minister in 1768 at the age of 33, leading the supporters of William Pitt, and was the youngest person to hold the office until the appointment of William Pitt the Younger 15 years later. However, he struggled to demonstrate an ability to counter increasing challenges to Britain's global dominance following the nation's victory in the Seven Years' War. He was widely attacked for allowing France to annex Corsica, and stepped down in 1770, handing over power to Lord North.