William Cecil, 3rd Marquess of Exeter

William Alleyne Cecil, 3rd Marquess of Exeter, PC (April 30, 1825 – July 14, 1895) was the son of Brownlow Cecil, 2nd Marquess of Exeter.

The Marquess of Exeter by Carlo Pellegrini, 1881.

He married Lady Georgina Sophia Pakenham, daughter of Thomas Pakenham, 2nd Earl of Longford, on 17 October 1848. They had at least nine children:

Brownlow Henry George, Lord Burghley (1849–1918)
Lord Francis Horace Pierrepont (1851–1889), married Edith Brookes, daughter of Sir William Brookes, 1st Baronet.
Lord William (1854–1943), married (1) Mary Tyssen-Amherst, Baroness Amherst, (2) Violet Freer.
Lady Catherine Sarah (1861–1918), married Henry Vane, 9th Baron Barnard.
Lord John Pakenham (1867-1942)
Lady Isabella Georgiana Katherine (d. 1903), married William Battie-Wrightson.
Lady Mary Louisa Wellesley (d. 1930), married James Hozier, 2nd Baron Newlands.
Lady Louisa Alexandrina (d. 1950), died unmarried.
Lady Frances Emily (d. 1951), died unmarried.

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Parliament of the United Kingdom
Preceded by: Christopher Turnor and Sir John Trollope	Member of Parliament for South Lincolnshire with Sir John Trollope 1847–1857	Succeeded by: Sir John Trollope and Anthony Wilson
Preceded by: Thomas Philip Maunsell and Augustus Stafford O'Brien-Stafford	Member of Parliament for North Northamptonshire with Augustus Stafford O'Brien-Stafford 1857, George Ward Hunt 1857–1867 1857–1867	Succeeded by: George Ward Hunt and Sackville George Stopford-Sackville
Political offices
Preceded by: Lord Otho FitzGerald	Treasurer of the Household 1866–1867	Succeeded by: Hon. Percy Egerton Herbert
Honorary Titles
Preceded by: The Earl of Tankerville	Captain of the Gentlemen-at-Arms 1867–1868	Succeeded by: Baron Foley
Peerage of the United Kingdom
Preceded by: Brownlow Cecil	Marquess of Exeter 1867–1895	Succeeded by: Brownlow Cecil