Which Prime Minister fought a duel with the George William Finch-Hatton, Earl of Winchilsea?

Field Marshal Arthur Wellesley, 1st Duke of Wellington (1 May 1769 – 14 September 1852) was an Anglo-Irish soldier and statesman, and one of the leading military and political figures of 19th-century Britain. His defeat of Napoleon at the Battle of Waterloo in 1815 put him in the top ranking of Britain's military heroes.

Arthur Wellesley was Prime Minister of the United Kingdom twice. The first time was 22 January 1828 – 16 November 1830. The second time was 14 November 1834 – 10 December 1834.

George William Finch-Hatton, 10th Earl of Winchilsea accused the Duke of "an insidious design for the infringement of our liberties and the introduction of Popery into every department of the State". Wellington responded by immediately challenging Winchilsea to a duel. On 21 March 1829, Wellington and Winchilsea met on Battersea fields. When the time came to fire, the Duke took aim and Winchilsea kept his arm down. The Duke fired wide to the right. Accounts differ as to whether he missed on purpose, an act known in dueling as a delope. Wellington claimed he did. However, he was noted for his poor aim and reports more sympathetic to Winchilsea claimed he had aimed to kill. Winchilsea did not fire, a plan he and his second had almost certainly decided upon before the duel. Honour was saved and Winchilsea wrote Wellington an apology.