Barons Grey de Ruthyn in the Peerage of England (1324 to 1639)
Earls of Kent in the Peerage of England (1465-1740)
Marquess of Kent in the Peerage of England (1706-1740)
Duke of Kent in the Peerage of Great Britain (1710-1740)
Barons Lucas of Crudwell in the Peerage of England (1663, from 1702-1740)
Marquess de Grey in the Peerage of Great Britain (1740–1797)
Barons Grey de Ruthyn
- Roger Grey, 1st Baron Grey de Ruthyn (d. 1353), son of John Grey, 2nd Baron Grey of Wilton.
- Reginald Grey, 2nd Baron Grey de Ruthyn (1319–1388)
- Reginald Grey, 3rd Baron Grey de Ruthyn (1362–1440)
Sir John Grey KG
- Sir John Grey KG (c. 1387–1439) son of 3rd Baron Grey de Ruthyn and father of 1st Earl of Kent.
- Edmund Grey, 4th Baron Grey de Ruthyn, 1st Earl of Kent (1416–1490)
- George Grey, 5th Baron Grey de Ruthyn, 2nd Earl of Kent (d. 1503)
3rd Earl of Kent KG
- Richard Grey, 6th Baron Grey de Ruthyn, 3rd Earl of Kent KG (1478–1523)
- Henry Grey, 7th Baron Grey de Ruthyn, 4th Earl of Kent (d. 1562)
- Reginald Grey, 8th Baron Grey de Ruthyn, 5th Earl of Kent (d. 1573)
- Henry Grey, 9th Baron Grey de Ruthyn, 6th Earl of Kent (1541–1615)
- Charles Grey, 10th Baron Grey de Ruthyn, 7th Earl of Kent (1545–1623)
- Henry Grey, 11th Baron Grey de Ruthyn, 8th Earl of Kent (1583–1639)
On his death the Earldom of Kent passed to his cousin as heir male of the 1st Earl of Kent while the Barony of Grey of Ruthin passed to his nephew, Charles Longueville, as heir general of the 1st Baron Grey of Ruthin. See below
- Anthony Grey, 9th Earl of Kent (1557–1643)
- Henry Grey, 10th Earl of Kent (1594–1651)
- Anthony Grey, 11th Earl of Kent (1645–1702) married Mary Lucas, 1st Baroness Lucas of Crudwell (d. 1702).
1st Duke of Kent KG
- 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.
Earl of Harold and 3rd Baron Lucas
- Anthony Grey, Earl of Harold, 3rd Baron Lucas (1695–1723) summoned to Parliament in 1718 in his father's Barony of Lucas of Crudwell.
2nd Marchioness Grey
- Jemima Yorke nee Campbell, 2nd Marchioness Grey, 4th Baroness Lucas (1722–1797) granddaughter of 1st Duke of Kent and daughter of John Campbell, 3rd Earl of Breadalbane and Holland and Lady Amabel Grey, married Hon. Philip Yorke later Earl of Hardwicke. See House of Yorke and See House of Robinson.
Barons Grey de Ruthyn in the Peerage of England (1324, from 1639)
Viscounts Longueville in the Peerage of England (1690-1799)
Earls of Sussex in the Peerage of Great Britain (1717-1799)
12th Baron Grey de Ruthyn
- Charles Longueville, 12th Baron Grey de Ruthyn (1612–1643) son of Lady Susan Grey (daughter of 7th Earl of Kent) and Sir Michael Longueville.
13th Baroness Grey de Ruthyn
- Susan Longueville, 13th Baroness Grey de Ruthyn (1634–1676) married Sir Henry Yelverton, 2nd Baronet (1633-1670) See House of Yelverton
14th Baron Grey de Ruthyn
- Charles Yelverton, 14th Baron Grey de Ruthyn (1657–1679)
1st Viscount Longueville and 15th Baron Grey de Ruthyn
- Henry Yelverton, 15th Baron Grey de Ruthyn, 1st Viscount Longueville (1664–1704)
Earls of Sussex
- Talbot Yelverton, 16th Baron Grey de Ruthyn, 1st Earl of Sussex, 2nd Viscount Longueville (1690–1731)
- George Augustus Yelverton, 17th Baron Grey de Ruthyn, 2nd Earl of Sussex (1727–1758)
- Henry Yelverton, 18th Baron Grey de Ruthyn, 3rd Earl of Sussex (1728–1799)
On his death the Earldom of Sussex and the Viscountcy of de Longueville became extinct the the Barony of Grey of Ruthin passed to his grandson:
19th Baron Grey de Ruthyn
- Henry Edward Yelverton, 19th Baron Grey de Ruthyn (1780–1810) son of 3rd Earl of Sussex’s daughter, Lady Barbara Yelverton (d.1781) and her husband, Edward Thoroton Gould.
20th Baroness Grey de Ruthyn
- Barbara Yelverton, 20th Baroness Grey de Ruthyn (1810–1858) married George Augustus Francis Rawdon-Hastings, 2nd Marquess of Hastings.
4th Marquess of Hastings and 21st Baron Grey de Ruthyn
- Henry Weysford Charles Plantagenet Rawdon-Hastings, 21st Baron Grey de Ruthyn, 4th Marquess of Hastings (1842–1868) (abeyant 1868)
On his death the Marquessate of Hastings, the Earldoms of Moira and Rawdon, the Viscountcy of Loudoun and the two Baronies of Rawdon became extinct, his Scottish titles (i,e, the Earldom of Loudoun and the Lordships of Campbell of Loudoun and of Tarrinzean and Mauchline) passed to his eldest sister and heir of line, and his six English Baronies in fee (i.e. Grey of Ruthin, Botreaux, Hungerford, de Moleyns, Hastings de Hastings and Hastings de Hungerford) fell into abeyance between his four sisters and co-heiresses.
22nd Baroness Grey de Ruthyn
- Bertha Lelgarde Clifton née Rawdon-Hastings, 22nd Baroness Grey de Ruthyn (1835–1887) (abeyance terminated 1885) second daughter of 4th Marquess of Hastings.
23rd and 24th Barons Grey de Ruthyn
- Rawdon George Grey Clifton, 23rd Baron Grey de Ruthyn (1858–1912)
- Cecil Talbot Clifton, 24th Baron Grey de Ruthyn (1862–1934) (abeyant 1934)
25th Baron Grey de Ruthyn
- John Lancelot Wykeham Butler-Bowdon, 25th Baron Grey de Ruthyn (1883–1963) (abeyance terminated 1940, abeyant 1963) grandson of Bertha Lelgarde Clifton, 22nd Baroness Grey de Ruthyn.
Barons Lucas of Crudwell in the Peerage of England (1663)
Earls of Kent in the Peerage of England (1465, from 1702-1740)
Duke of Kent in the Peerage of Great Britain (1740, from 1740-1740)
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)
Earl Cowper in the Peerage of Great Britain (1718, from 1859-1905)
1st Baron Lucas of Shenfield
- 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."
1st Duke of Kent KG (Simple Arms)
- 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.
Earl of Harold and 3rd Baron Lucas
- Anthony Grey, Earl of Harold, 3rd Baron Lucas (1695–1723) summoned to Parliament in 1718 in his father's Barony of Lucas of Crudwell.
2nd Marchioness Grey and 4th Baroness Lucas
- Jemima Yorke nee Grey, 2nd Marchioness Grey, 4th Baroness Lucas (1722–1797)
1st Countess de Grey and 5th Baroness Lucas
- Amabel Hume-Campbell nee Yorke, 1st Countess de Grey, 5th Baroness Lucas (1751–1833)
2nd Earl de Grey and 6th Baron Lucas
- Thomas Philip de Grey, 2nd Earl de Grey, 6th Baron Lucas (1781–1859) Created in 1816 Countess de Grey, with remainder to her only sister and the heirs male of her body. See House of Robinson.
7th Baroness Lucas
- Anne Florence Cowper nee de Grey, Countess Cowper, 7th Baroness Lucas (1806–1880) See House of Cowper
7th Earl Cowper and 8th Baron Lucas
- Francis Thomas de Grey Cowper, 7th Earl Cowper, 8th Baron Lucas and 4th Lord Dingwall KG (1834–1905)
9th Baron Lucas
- Auberon Thomas Herbert, 9th Baron Lucas and 5th Lord Dingwall (1876–1916) son of the Hon. Auberon Herbert, younger son of Henry Herbert, 3rd Earl of Carnarvon. His mother was Lady Florence, daughter of George Cowper, 6th Earl Cowper
- Nan Ino Cooper, 10th Baroness Lucas and 6th Lady Dingwall (1880–1958) sister of 9th Baron Lucas
- Anne Rosemary Palmer, 11th Baroness Lucas and 7th Lady Dingwall (1919–1991)
12th Baron Lucas
- Ralph Matthew Palmer, 12th Baron Lucas and 8th Lord Dingwall (b. 1951) son of Major The Hon. Robert Jocelyn Palmer (fifth child and third son of the 3rd Earl of Selborne) and the 11th Baroness Lucas and 7th Lady Dingwall.