, London Upon his elder brother, the
5th Duke of Richmond, joining
Lord Grey's ministry in 1831, Lennox was returned for
Chichester in 1831. He eventually succeeded
John Young as a
Junior Lord of the Treasury in Peel's second ministry, but he was obliged to resign his seat in 1846 owing to his support for repeal of the
Corn Laws and was succeeded in the treasury by
William Cripps.
Military career Lennox was commissioned as an Ensign into the
71st Foot in 1823. He was promoted lieutenant in 1825, captain (half-pay) in 1826, major in 1838 and
lieutenant-colonel in 1842. He transferred to the
72nd Foot in 1843, to the
6th Foot in 1845, and to the
68th Foot in 1852 before retiring in 1854. He was made Lieutenant-colonel of the
Royal Sussex Light Infantry Militia in 1854 and Lieutenant-
colonel-commandant in 1860. He served as
Clerk of the Ordnance, replacing
Henry George Boldero in 1845. In 1846, he was replaced by
George Anson. ==Personal life==