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Personal data
Name
William Petty
Born May 02, 1737
in Dublin

Died May 07, 1805
at Berkeley Square, London
Alias
1st Marquess of Lansdowne
The Earl of Shelburne
Biography

Son of John Fitzmaurice (1706-1761), 1st Earl of Shelburne. Married (ca. 1764) to Sophia Carteret (1745-1771), daughter of the 1st Earl Granville, with whom he had at least one child.1 Married (ca. 1779) to Louisa FitzPatrick (1755-1789), with whom he had at least two children.2

Life with Boswell

Boswell met Petty, Lord Shelburne, when he called on William Pitt on February 23, 1766, in London. Pitt was an ordinary MP at the time but he was appointed Prime Minister later that year and included Shelburne in his government as Southern Secretary.