|Dukedom of Leeds|
Quarterly, 1st & 4th: quarterly ermine and azure, over all a cross or (for Osborne); 2nd, gules, an eagle with two heads display, between three fleur-de-lis argent (for Godolphin); 3rd, azure, semé of cross-crosslets and three cinquefoils argent (for D'Arcy)
|Creation date||4 May 1694|
|Monarch||William III and Mary II|
|Peerage||Peerage of England|
|First holder||Thomas Osborne, 1st Duke of Leeds|
|Last holder||D'Arcy Osborne, 12th Duke of Leeds|
|Remainder to||the 1st Duke's heirs male of the body lawfully begotten|
|Subsidiary titles||Viscount Osborne|
Earl of Danby
Marquess of Carmarthen
|Extinction date||20 March 1964|
|Former seat(s)||Kiveton Hall|
Duke of Leeds was a title in the Peerage of England. It was created in 1694 for the prominent statesman Thomas Osborne, 1st Marquess of Carmarthen due to being on the Immortal Seven in the Revolution of 1688. He had already succeeded as 2nd Baronet, of Kiveton (1647) and been created Viscount Osborne, of Dunblane (1673), Baron Osborne, of Kiveton in the County of York (also 1673) and Viscount Latimer, of Danby in the County of York (also 1673), Earl of Danby, in the County of York (1674), and Marquess of Carmarthen (1689). All these titles were in the Peerage of England, except for the viscountcy of Osborne, which was in the Peerage of Scotland.[note 1] He resigned the latter title in favour of his son in 1673. The Earldom of Danby was a revival of the title held by his great-uncle, Henry Danvers, 1st Earl of Danby (see Earl of Danby).
The Dukedom was named for Leeds in Yorkshire, and did not (as is sometimes claimed) refer to Leeds Castle in Kent. The principal ducal seat was Kiveton Hall. After Kiveton Hall was demolished in 1811, Hornby Castle became the main seat of the Dukes of Leeds. The traditional burial place of the Dukes of Leeds was All Hallows Church, Harthill, South Yorkshire.
The 4th Duke married Mary Godolphin, daughter of Henrietta Churchill Godolphin, su jure Duchess of Marlborough, and The 2nd Earl of Godolphin, and assumed the arms of Godolphin and Churchill.
Upon the death of the 7th Duke in 1859, the dukedom passed to his cousin, The 2nd Baron Godolphin, whose father (the second son of The 5th Duke of Leeds) had been created Baron Godolphin, of Farnham Royal in the County of Buckingham, in 1832.
The 11th Duke was married three times; he had a daughter, Lady Camilla Osborne, but no son. Upon his death in 1963, the dukedom passed to his cousin, Sir D'Arcy Osborne, a diplomat. Eight months later, the 12th Duke died in Rome, unmarried, at which point the dukedom and the Barony of Godolphin became extinct.
The heir apparent to the Duke of Leeds was styled Marquess of Carmarthen; Lord Carmarthen's heir apparent was styled Earl of Danby; and Lord Danby's heir apparent was styled Viscount Latimer.
Osborne Baronets, of Kiveton (1620)
- Sir Edward Osborne, 1st Baronet (1596–1647)
- Sir Thomas Osborne, 2nd Baronet (1632–1712) (created Viscount Osborne in 1673, Earl of Danby in 1673, Marquess of Carmarthen in 1689 and Duke of Leeds in 1694)
Dukes of Leeds (1694)
- Thomas Osborne, 1st Duke of Leeds (1632–1712)
- Edward Osborne, Viscount Latimer (1655–1689), eldest son of the 1st Duke, died without surviving issue
- Peregrine Osborne, 2nd Duke of Leeds (1659–1729), second son of the 1st Duke
- Peregrine Hyde Osborne, 3rd Duke of Leeds (1691–1731), only son of the 2nd Duke
- Thomas Osborne, 4th Duke of Leeds (1713–1789), only son of the 3rd Duke
- Francis Godolphin Osborne, 5th Duke of Leeds (1751–1799), only son of the 4th Duke
- George William Frederick Osborne, 6th Duke of Leeds (1775–1838), eldest son of the 5th Duke
- Francis George Godolphin D'Arcy D'Arcy-Osborne, 7th Duke of Leeds (1798–1859), eldest son of the 6th Duke, died without issue
- Other titles (8th Duke onwards): Baron Godolphin (1832)
- George Godolphin Osborne, 8th Duke of Leeds (1802–1872), eldest son of the 5th Duke's second son, The Lord Godolphin
- George Godolphin Osborne, 9th Duke of Leeds (1828–1895), eldest son of the 8th Duke
- George Osborne, Earl of Danby (1861), eldest son of the 9th Duke (then Lord Carmarthen), died in infancy during his grandfather's lifetime
- George Godolphin Osborne, 10th Duke of Leeds (1862–1927), second son of the 9th Duke
- John Francis Godolphin Osborne, 11th Duke of Leeds (1901–1963), only son of the 10th Duke, died without male issue
- Francis D'Arcy Godolphin Osborne, 12th Duke of Leeds (1884–1964), grandson of Lord Godolphin's third son, died without issue, at which point all of his titles became extinct
- Some sources indicate that Osborne held two Scottish viscountcies – "of Osborne" and "of Dunblane", although this may be a confusion of the full form "Osborne of Dunblane"
- George Edward Cokayne Complete Baronetage Volume 1 1900
- Genealogical and Heraldic Dictionary of the Peerage and Baronetage of the British Empire. Burke's Peerage Limited. 1914. pp. 1181–1183. Retrieved 18 September 2017.
- www.rotherhamweb.co.uk: Harthill Archived 24 December 2015 at the Wayback Machine. Retrieved 18 December 2015
- "Osborne family, Dukes of Leeds". The National Archives. Retrieved 12 February 2013.
- Courthope, William (1839). Debrett's Complete Peerage of the United Kingdom of Great Britain and Ireland: With Additions to the Present Time and a New Set of Coats of Arms from Drawings by Harvey. J. G. & F. Rivington. p. 14. Retrieved 19 September 2017.
- Foster, Joseph (1891). Alumni Oxonienses: the Members of the University of Oxford, 1715-1886: Their Parentage, Birthplace, and Year of Birth, with a Record of Their Degrees. University of Oxford. p. 1046. Retrieved 19 September 2017.
- Burke, Sir Bernard (1866). A Genealogical History of the Dormant: Abeyant, Forfeited, and Extinct Peerages of the British Empire. Harrison. p. 156. Retrieved 19 September 2017.
- "The Duke of Leeds". The Times. The Times Digital Archive. 29 July 1963. p. 19.
- "The Duke of Leeds – Former Minister to the Holy See". The Times. The Times Digital Archive. 21 March 1964. p. 12.