Arthur Hill , 2nd Marquess of Downshire PC , FRS ( 3 March 1753 -- 7 September 1801 ) , styled Viscount Kilwarlin until 1789 .
Earl of Hillsborough from 1789 to 1793 , was a British peer and MP .
Arthur Hill , 2nd Marquess of Downshire PC , FRS ( 3 March 1753 -- 7 September 1801 ) , styled Viscount Kilwarlin until 1789 and Earl of Hillsborough from 1789 to 1793 , was a British peer and MP .