He was secretary to John Russell, 4th Duke of Bedford at the Peace of Paris in 1763, and to Francis Seymour-Conway, 1st Marquess of Hertford when Lord Lieutenant of Ireland.
In November 1778, he was appointed inspector of plays by the Marquis of Hertford, who was then Lord Chamberlain.
He is said to have been strict and careful, and to have left behind him manuscript copies of all the plays submitted to the inspector from 1737 till 1824.
[2] Together, they were the parents of two sons, both of whom, by licence dated 14 June 1819, added the name de Hochepied: Larpent died 18 January 1824.
On 25 March 1828, his elder son from his second marriage succeeded his maternal uncle as 7th Baron de Hochepied, the family's Hungarian title.