1st Baron: Thomas Francis Fremantle

1798-1890. Eldest son of Admiral Sir Thomas and Betsy [Wynne] Fremantle (see family tree). Lived at Swanbourne.

• 11 March 1798: Born
• 1821: Awarded a baronetcy in in recognition of his father's services
• 1824: Married Louisa Elizabeth Nugent 24 November
• 1824: Awarded peerage in recognition of own services
• 1826-46: Elected MP for Buckingham on 23 May 1826, succeeding his uncle, William Henry Fremantle
• 1833: Trustee of the Grenville estates during the Duke's financial difficulties
• 1834-35: Secretary to the Treasury
• 1841-44: Secretary to the Treasury in Robert Peel's administration
• 1844: Secretary at War
• 1845-46: Chief Secretary for Ireland
• 1846: Resigned as MP to become Deputy Chairman, subsequently Chairman, of the Board of Customs (until 1873).
• 3 December 1890: Died

Also a Justice of the Peace and Lord of the Manor of Swanbourne.

Tom had proposed to Louisa by 30 June 1824 but Sir George Nugent refused to give Louisa a good settlement unless Tom's parents contributed more (BRO D-FR/46/11/104). Matters were however resolved by October (letter).

1st Baroness: Louisa Elizabeth [Nugent] Fremantle

1803-1875. Daughter of Field Marshall Sir George Nugent and Maria Skinner. The first Duke thought her ill treated by her mother: 

Lady Sr George Nugent hacks her poor girl about too much. I wish she may not over do her objects, as Louisa is a very good & charming girl. (HEH ST 95; entry for 25 May 1823)

• Born: 8 September 1803
• Married: Thomas Francis Fremantle 24 November 1824
• About 8 children including:
  • Thomas Francis: 2nd Baron Cottesloe (1830-1918)
  • William Henry: (1831-1916)
  • Charles: (1834-1914)
  • Edmund Robert (15 June 1836 - 10 February 1929)
  • Stephen: (2 April 1845 - 16 September 1874); Clerk in Holy Orders
  • Augusta Mary (?  - 1 June 1903)
  • Emily Caroline (1838-1929)
  • Celia Elizabeth
• Died: 17 August 1875

2nd Baron Cottesloe: Thomas Francis Fremantle

• Born: 30 January 1830
• Lord of Manor of Swansbourne
• Married Augusta Henrietta Scott (13 May 1836 - 4 November 1906), daughter of 2nd Earl of Eldon
• 1876-1885: MP for Buckinghamshire
• 1899-1910: Chairman of Quarter Sessions
• 1897-1904: Chairman on Buckinghamshire County Council
•  Died 13 April 1918

3rd Baron Cottesloe: Thomas Francis Fremantle

• 30 years Lord Lieutenant of Buckinghamshire
• Actively associated with County Volunteers for 70 years he commanded the Bucks Battalion and became its Honorary Colonel
• A member of Buckinghamshire County Council since its creation and Vice Chairman
• Chairman of Quarter Sessions
• Chairman of the National Rifle Association: "the most distinguished rifleman and the foremost authority of firearms of his generation"
• Married Florence Tapling (died 4 April 1956); daughter of John Tapling of Kingswood, Dulwich
• Died: 19 July 1956

Sources

Memorials at Swanbourne, Parry  and others.