William Cavendish, 4th Duke of Devonshire,
KG,
PC (
8 May 1720 –
2 October 1764), styled Lord Cavendish of Hardwick before
1729 and Marquess of Hartington between
1729 and
1755, was a
British Whig statesman who was briefly titular
Prime Minister of Great Britain. He was elected
MP for
Derbyshire in
1741 and
1747, but left the
House of Commons for the
Lords in
1751 by a
writ of acceleration as Baron Cavendish of Hardwick and was sworn of the
Privy Council. He was
Lord Lieutenant of Ireland from
2 April 1755 until
3 January 1757, when his successor, the
4th Duke of Bedford, entered the office. After inheriting
his father's peerage titles (chiefly the
Dukedom of Devonshire), Devonshire was given the
Garter and appointed
First Lord of the Treasury (most historians consider him Prime Minister during this service) in November
1756, and he served as First Lord until May
1757 in an administration effectively run by
William Pitt the Elder. In
1762, he was sworn of the
Privy Council of Ireland.
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