He served briefly as Under-Secretary of State for Foreign Affairs under his uncle Lord Melbourne in 1834.
His mother married as her second husband the future Prime Minister Henry Temple, 3rd Viscount Palmerston, in 1839.
[1] He retired on the half-pay of the New South Wales Veteran Companies in March 1831,[2] but exchanged into a lieutenancy in the 31st Regiment of Foot on 13 February 1835.
[4] However, in 1833 he had accepted command of a Troop in the part-time South Hertfordshire Yeomanry Cavalry with the rank of captain, which he held until his resignation in April 1832.
[5] Cowper entered the House of Commons for Canterbury in the 1830 general election,[6] and served briefly under his uncle Lord Melbourne as Under-Secretary of State for Foreign Affairs between November and December 1834.