Earls of Hardwicke
Barons Hardwicke of Hardwicke in the Peerage of Great Britain (1733)
Earls of Hardwicke in the Peerage of Great Britain (1754)
1st Earl of Hardwicke
- Philip Yorke, 1st Earl of Hardwicke, 1st Viscount Royston, of Royston, 1st Baron Hardwicke of Hardwicke (1690–1764) Lord High Chancellor of Great Britain 1737-56
2nd Earl of Hardwicke
- Philip Yorke, 2nd Earl of Hardwicke (1720–1790) married Lady Jemima Campbell, suo jure Baroness Lucas of Crudwell and Marchioness Grey (1722- 1797), only child of John Campbell, 3rd Earl of Breadalbane and Holland, by his first wife Lady Amabel Grey, 1st daughter and coheirss of Henry Grey, 1st Duke of Kent.
3rd Earl of Hardwicke KG
- Philip Yorke, 3rd Earl of Hardwicke KG (1757–1834)
- Philip Yorke, Viscount Royston (1784–1808)
- Charles Philip Yorke, 4th Earl of Hardwicke (1799–1873)
- Charles Philip Yorke, 5th Earl of Hardwicke (1836–1897)
- Albert Edward Phillip Henry Yorke, 6th Earl of Hardwicke (1867–1904)
- John Manners Yorke, 7th Earl of Hardwicke (1840–1909)
- Charles Alexander Yorke, 8th Earl of Hardwicke (1869–1936)
- Philip Grantham Yorke, 9th Earl of Hardwicke (1906–1974)
- Joseph Philip Sebastian Yorke, 10th Earl of Hardwicke (b. 1971)
The Hon. Charles Yorke
- The Hon. Charles Yorke (1722–1770) Lord High Chancellor of Great Britain 1770, designated but never created Baron Morden, second son of Philip Yorke, 1st Earl of Hardwicke.
Baron Dover in the Peerage of Great Britain (1788–1792)
1st Baron Dover KB
- The Hon. Sir Joseph Yorke, 1st Baron Dover KB (1724–1792) third son of Philip Yorke, 1st Earl of Hardwicke
Barons Lucas of Crudwell in the Peerage of England (1663)
Marquess de Grey in the Peerage of Great Britain (1740, from 1740-1797)
Earl de Grey in the Peerage of the United Kingdom (1816, from 1797-1859)
- Mary Grey nee Lucas, Countess of Kent, 1st Baroness Lucas (d. 1702) only child of John Lucas, 1st Baron Lucas of Shenfield. Created Baroness Lucas of Crudwell, with remainder to her heirs male by the said Earl of Kent with the proviso "that if at any time or times after the death of the said Mary, Countess of Kent, and in default of issue male of her body by the said Earl begotten, there shall be more persons than one who shall be coheirs of her body by the said Earl, so that the King of his heirs might declare which of them should have the dignity, or otherwise the dignity should be suspended or extinguished, then, nevertheless, the dignity should not be suspended or extinguished, but should go and be held and enjoyed from time to time by such of the said coheirs as by source of descent and the common law of the realm should be inheritable in other entire and indivisible inheritancy, as namely, an office of honour and public trust, or a castle for the necessary defence of the realm,and the like, in case such inheritance had been given and limited to the said Countess and the heirs of her body by the said Earl begotten."
- Henry Grey, 1st Duke of Kent, 1st Marquess de Grey, 1st Marquess of Kent, Earl of Harold and Viscount Goderich, 2nd Baron Lucas KG (1671–1740) Created Marquess de Grey, with a special remainder failing heirs male of his body to his grand-daughter, Jemima Campbell, and the heirs male of her body. See House of Grey.
2nd Marchioness Grey
- Jemima Yorke nee Grey, 2nd Marchioness Grey, 4th Baroness Lucas (1722–1797) married Philip Yorke, 2nd Earl of Hardwicke (1720–1790)
1st Countess de Grey
- Amabel Hume-Campbell nee Yorke, 1st Countess de Grey, 5th Baroness Lucas (1751–1833) Created in 1816 Countess de Grey, with remainder to her only sister and the heirs male of her body. See House of Robinson.