George Montagu, 6th Duke of Manchester

George Montagu, 6th Duke of Manchester, etc. (Kimbolton Castle, 9 July 1799 – Tunbridge Wells, 18 August 1855), known as Viscount Mandeville from 1799 to 1843, was a British peer and Tory Member of Parliament.
Manchester was the son of William Montagu, 5th Duke of Manchester. His father, who was Governor of Jamaica, had the newly founded town of Mandeville, Jamaica named after his eldest son, who, as was customary, carried the title of Viscount Mandeville before he succeeded to his father's title. He was MP for Huntingdonshire 1826–1837.
He married, firstly, Millicent Sparrow (25 January 1798 – Kimbolton Castle, 21 November 1848), daughter of Brig. Gen. Robert Bernard Sparrow of Brampton Park, Huntingdonshire (d. 1805), and wife (married on 14 March 1797) the Hon. Olivia Acheson (d. 12 February 1863), daughter of the 1st Earl of Gosford, on 8 October 1822 at London. They had four children:
William Montagu, 7th Duke of Manchester (1823–1892)
Lord Robert Montagu (1825–1902), married Ellen Cromie and Elizabeth Wade and had issue.
Lord Frederick Montagu (5 October 1828 – 29 October 1854), who died unmarried and without issue
Lady Olivia Montagu (18 July 1830 – Greystones, Tunbridge Wells, Kent, 15 February 1922 and interred at Chillingham on 20 February 1922), married at Kimbolton Castle, Huntingdonshire, 29 January 1850 Charles Bennet, 6th Earl of Tankerville, and had issue.
He married, secondly, Harriet Sydney Dobbs (4 December 1834 – Ore, Sussex, 20 May/30 May 1907), daughter of Conway Richard Dobbs of Castle Dobbs, Antrim, Ireland, and wife, on 29 August 1850 at Kilroot, County Antrim, later remarried without issue on 16 December 1858 to Sir Stevenson Arthur Blackwood, and had two children:
Lady Sydney Charlotte Montagu (14 October 1851 – Keithhall, Inverurie, Aberdeen, 21 September 1932), married at St. George, Hanover Square, London, 14 August 1873 Algernon Hawkins Thomond Keith-Falconer, 9th Earl of Kintore
Lord George Francis Montagu (18 January 1855 – 12 March 1882), a Lieutenant who died unmarried and without issue

• 1799-1826: Viscount Mandeville
• 1826-1837: Viscount Mandeville MP
• 1837-1843: Viscount Mandeville
• 1843-1855: His Grace The Duke of Manchester