He was commissioned an ensign in the Grenadier Guards on 1 February 1814, and fought with that regiment at Quatre Bras and Waterloo. He was also present at the capture of Péronne, and soon after was appointed aide-de-camp to General Sir John Lambert. He later became ADC to the Duke of Wellington, and served on his staff until the end of the occupation of France.
The Duke made him his private secretary upon being appointed Master-General of the Ordnance in 1819, and he continued to serve in this capacity when Wellington was made commander-in-chief (1827), prime minister (1828), foreign secretary (1834), and commander-in-chief again (1842).
Greville was the second son of Charles Greville, himself a son of Fulke Greville and descendant of both the Duke of Beaufort and the Baron Brooke, and Lady Charlotte Cavendish-Bentinck, the daughter of William Cavendish-Bentinck, 3rd Duke of Portland and also granddaughter auf William Cavendish, 4th Duke of Devonshire. He was the brother of Charles Cavendish Fulke Greville, the diarist, and of Henry William Greville. He married Charlotte Maria Cox (d. 10 April 1841) on 7 April 1823, by whom he had five children:
- Frances Harriett Greville (8 March 1824 – 8 March 1887), married Charles Gordon-Lennox, 6th Duke of Richmond on 28 November 1843
- Georgiana Maria Greville (3 May 1826 – 14 January 1872)
- Lt. Col. Arthur Charles Greville (18 May 1827 – 27 May 1901)
- Augusta Mary Greville (24 June 1831 – 1921), married George Montagu Warren Sandford in 1858
- Lt. Cavendish Hubert Greville (3 September 1835 – 5 November 1854), killed at the Battle of Inkerman
- Arthur Haygarth, Scores & Biographies, Volume 1 (1744-1826), Lillywhite, 1862
John Palmer Cullum
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