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Born at Tandragee Castle, County Armagh, Ireland, the young Lord Mandeville was the son of the 9th Duke of Manchester, by his marriage to Helena, the daughter of Eugene Zimmerman, of the USA.
Edmund de Mortimer, 3rd Earl of March and jure uxoris Earl of Ulster (1 February 1352 – 27 December 1381) was son of Roger Mortimer, 2nd Earl of March, by his wife Philippa, daughter of William Montagu, 1st Earl of Salisbury and Catherine Grandison.
Susan (Gordon Castle, 2 February 1774 – Bedfont Lodge, 26 August 1828), the third daughter, married on 7 October 1793 in Edinburgh William Montagu, 5th Duke of Manchester, and Madeleine (Gordon Castle, 1772 – 31 May 1847), the second daughter, married firstly on 2 April 1789 in London Sir Robert Sinclair, 7th Baronet.
He was born John Hussey, only son of Edward Hussey of Westown, County Dublin, by his wife Isabella, widow of William Montagu, 2nd Duke of Manchester, and eldest daughter of John Montagu, 2nd Duke of Montagu.
Montacute was the third son of William Montagu, 2nd Baron Montagu (d. 18 October 1319), by Elizabeth Montfort (d. August 1354), daughter of Sir Piers Montfort of Beaudesert, Warwickshire.
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He had two elder brothers, John, who died in August 1317, and William Montagu, 1st Earl of Salisbury, and a younger brother, Edward Montagu, 1st Baron Montagu, who married Alice of Norfolk, daughter of Thomas of Brotherton and granddaughter of Edward I.
In 1344, the Earl of Salisbury, William Montacute of Bisham Manor, was killed in a jousting tournament at Windsor.
He was a member of the Board of Governors of the European Cultural Foundation, and was Chairman of the British Institute of Recorded Sound 1970–73.
After his return to Britain he served as Postmaster General between 1827 and 1830 (succeeding his younger brother Lord Frederick Montagu).
#Lady Louisa Augusta Beatrice Montagu (Kimbolton Castle, 17 January 1856 – London, 3 March 1944), married London, 10 August 1876 Archibald Acheson, 4th Earl of Gosford and had issue.
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#Lady Mary Louisa Elizabeth Montagu (Kimbolton Castle, 27 December 1854 – 10 February 1934), married firstly at Kimbolton Castle, 10 December 1873 William Douglas-Hamilton, 12th Duke of Hamilton and had issue, and secondly 20 July 1897 to Robert Carnaby Forster of Easton Park, Wickham Market, Suffolk (d. 23 June 1925), without issue.