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Thomas Osborne, 4th Duke of Leeds

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Title: Thomas Osborne, 4th Duke of Leeds  
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Subject: Francis Godolphin, 2nd Earl of Godolphin, James Grenville, Isles of Scilly, Sarah Churchill, Duchess of Marlborough, 1713
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Thomas Osborne, 4th Duke of Leeds

Portrait, oil on canvas, of The Duke of Leeds by Thomas Hudson

Thomas Osborne, 4th Duke of Leeds KG, PC, DL, FRS (6 November 1713 – 23 March 1789),[1] styled Earl of Danby from birth until 1729 and subsequently Marquess of Carmarthen until 1731, was a British peer, politician and judge.


He was the older and only surviving son of Peregrine Osborne, 3rd Duke of Leeds and his first wife Elizabeth, youngest daughter of Robert Harley, 1st Earl of Oxford and Earl Mortimer.[2] Osborne was educated at Westminster School and then Christ Church College, Oxford, where he matriculated in 1731.[3] In the same year, he succeeded his father as duke.[4] Osborne received a Doctorate of Civil Law in 1738[3] and became a Fellow of the Royal Society a year later.[5]


The Duke of Leeds as a child, in Highland costume, with a targe, a sword and a pistol beside him, in a landscape, oil on canvas, by Hans Hausing, 1726

Osborne became a Lord of the Bedchamber in 1748 and was appointed Justice in Eyre south of Trent in November of the same year.[6] In June 1749, he was made a Knight of the Order of the Garter and in 1756, resigning from his post as justice, was nominated Cofferer of the Household.[7] He was sworn of the Privy Council of Great Britain a year later and became Justice in Eyre north of Trent in 1761, an office he held until 1774.[6] Osborne was a Deputy Lieutenant of the West Riding of the County of Yorkshire.[8] In 1766 he inherited the office of Governor of Scilly and the lease of these islands from his father-in-law.


On 26 June 1740, he married Lady Mary Godolphin, second daughter of Francis Godolphin, 2nd Earl of Godolphin and his wife Henrietta Godolphin (née Churchill), 2nd Duchess of Marlborough, and had by her three sons and a daughter.[2] Osborne died, aged 73 at St James's Square and was buried at Harthill, South Yorkshire.[3] He was succeeded in his titles by his third and only surviving son Francis.[2]


  1. ^ "Leigh Rayment - Peerage". Retrieved 30 July 2009. 
  2. ^ a b c Debrett, John (1828). Debrett's Peerage of the United Kingdom of Great Britain and Ireland. vol. I (17th ed.). London: G. Woodfall. p. 19. 
  3. ^ a b c Cokayne, George Edward (1887). Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom. vol. V. London: George Bell & Sons. p. 37. 
  4. ^ "ThePeerage - Thomas Osborne, 4th Duke of Leeds". Retrieved 31 March 2007. 
  5. ^ "Royal Society - Library and Archive catalogue". Retrieved 30 July 2009. 
  6. ^ a b Collins, Arthur (1812). Sir Egerton Brydges, ed. Collins's Peerage of England. vol. I. London: F. C. and J. Rivington et al. p. 260. 
  7. ^ Haydn, Joseph (1851). Beatson's Political Index modernised: The Book of Dignities; Containing Rolls of the Official Personages of the British Empire. London: Longman, Brown, Green and Longman's. p. 214. 
  8. ^ Doyle, James Edmund (1886). The Official Baronage of England. vol. II. London: Longmans, Green & Co. p. 329. 
Legal offices
Preceded by
The Earl of Halifax
Justice in Eyre
south of Trent

1748 – 1756
Succeeded by
The Lord Sandys
Preceded by
The Lord Sandys
Justice in Eyre
north of Trent

1761 – 1774
Succeeded by
The Lord Pelham of Stanmer
Political offices
Preceded by
Sir George Lyttelton, Bt
Cofferer of the Household
1756 – 1761
Succeeded by
James Grenville
Honorary titles
Preceded by
The Earl of Godolphin
Governor of the Isles of Scilly
Succeeded by
Francis Osborne
Peerage of England
Preceded by
Peregrine Osborne
Duke of Leeds
1731 – 1789
Succeeded by
Francis Osborne
Baron Osborne
(descended by acceleration)

1731 – 1776
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