William Petty, 1st Marquess of Lansdowne (2 May 1737 – 7 May 1805), known as The Earl of Shelburne between 1761 and 1784, by which title he is generally known to history, was an Irish-born British Whig statesman who was the first Home Secretary in 1782 and then Prime Minister in 1782–83 during the final months of the American War of Independence. He succeeded in securing peace with America and this feat remains his most notable legacy. He was also well known as a collector of antiquities and works of art.
In March 1782 following the down fall of the North Government Shelburne agreed to take office under Lord Rockingham on condition that the King would recognise the United States. Following the sudden and unexpected death of Lord Rockingham on 1 July 1782 Shelburne succeeded him as Prime Minister. Shelburne's appointment by the King provoked Charles James Fox and his supporters, including Edmund Burke, to resign their posts on 4 July 1782. Burke scathingly compared Shelburne to his predecessor Rockingham. One of the figures brought in as a replacement was the 23-year-old William Pitt, son of Shelburne's former political ally, who became Chancellor of the Exchequer. That year, Shelburne was appointed to Order of the Garter as its 599th Knight.