Lady Katherine Percy
Lady Katherine Percy( 18 May 1423 –) was the daughter of Henry Percy, 2nd Earl of Northumberland and Lady Eleanor Neville.
Her maternal grandparents were Ralph Neville, 1st Earl of Westmorland and his second wife Joan Beaufort, a legitimized daughter of John of Gaunt.
She married Edmund Grey, 1st Earl of Kent and had seven children:
George Grey, 2nd Earl of Kent
George Grey, 2nd Earl of Kent( 1454 – 25 December 1505) was the son of Edmund Grey, 1st Earl of Kent and Lady Katherine Percy.
He was the Second Earl of Kent from 1490 to 1505.
John Grey (knight)
Sir John Grey (c. 1387 – 27 August 1439), English nobleman and soldier, of Ruthin, Denbighshire, Wales, Badmondisfield (in Wickhambrook), Suffolk, Great Gaddesden, Hertfordshire, etc., second but eldest surviving son and heir apparent of Sir Reginald Grey, 3rd Baron Grey de Ruthyn by his 1st wife, Margaret Roos.
He was also Captain of Gournay.
He traveled with the king to France in 1415 and 1417.
He fought at the Battle of Agincourt and was invested as the 151st Knight of the Garter on 5 May 1436.
He married (first) before Trinity term 1410
(as her second husband)
Constance Holland (c.1387–14
November 1437), the daughter of John Holland, 1st Duke of Exeter
(half brother of King Richard II), by his wife, Elizabeth of Lancaster.
By her mother, Constance was a niece of King Henry IV.
Constance married (first) before 1 June 1402 (by papal dispensation dated 18 Sept. 1391, they being related in the fourth degree of kindred)
Sir Thomas Mowbray, 4th Earl of Norfolk, Earl of Nottingham, Earl Marshal, Lord Mowbray, Segrave, and Gower.
They had no issue.
Sir Thomas Mowbray was executed 8 June 1405 due to his revolt against her uncle, King Henry IV.
Sir John Grey and Constance Holland had three children:
Constance, Countess Marshal, died 12 (or 14)
Nov. 1437, and was buried in a chapel at St. Katherine by the Tower, London by her brother, John Holland, Duke of Exeter.
Following her death, Sir John Grey married (2nd) before 1 July 1438 Margaret Mowbray, daughter of Thomas Mowbray, 1st Duke of Norfolk and widow of Sir Robert Howard.
They had no issue.
Sir John Grey died 27 August 1439.
His widow, Margaret, received a papal indult for a portable altar 3 August 1446.
She died shortly before 18 October 1459.
Henry Grey, 1st Duke of Kent
Henry Grey, 1st Duke of Kent, KG, PC( 16715 June 1740) was a British politician and courtier.
Henry Grey, 8th Earl of Kent
Henry Grey, 8th Earl of Kent( c. 1583 – 21 November 1639) of Wrest Park, Bedfordshire was Earl of Kent from 1623 to his death.
He was born the only son of Charles Grey, 7th Earl of Kent and his wife Susan Cotton and educated at Trinity College, Cambridge.
On 16 November 1601, at St Martin- in- the- Fields, Henry married Elizabeth Talbot( 1582 – 7 December 1651), a daughter of Gilbert Talbot, 7th Earl of Shrewsbury and Mary Cavendish.
There were no known children from this marriage.
He was knighted in 1603.
He was elected Member of Parliament for Tavistock in 1601 and knight of the shire for Bedfordshire in 1614.
He served as Lord Lieutenant of Bedfordshire from 1621 to 1627 and again from 1629 to his death.
From 1621 to 1623, Henry held the title jointly with his father Charles Grey, 7th Earl of Kent.
From 1625 to 1627 and again from 1629 to his death, he held the title jointly with Thomas Wentworth, 1st Earl of Cleveland.
He died childless and his primary title as Earl of Kent was inherited by his closest male- line relative, Anthony Grey, 9th Earl of Kent, the Rector of Burbage, Leicestershire.
Anthony was a second cousin of his father as they were both great- grandsons of George Grey, 2nd Earl of Kent.
His title of Baron Grey de Ruthyn was awarded by the House of Lords to his nephew Charles Longueville, 12th Baron Grey de Ruthyn, son of his sister Susan.
Gilbert Talbot, 3rd Baron Talbot
Gilbert Talbot, 3rd Baron Talbot( c. 1332–1387) was an English nobleman and soldier.
He was the grandfather of John Talbot, 1st Earl of Shrewsbury.
Henry Grey, 4th Earl of Kent
Henry Grey, 4th Earl of Kent( c. 1495 – 24 September 1562) was Earl of Kent from 1524 to his death.
He was a son of George Grey, 2nd Earl of Kent and his second wife Catherine Herbert.
His maternal grandparents were William Herbert, 1st Earl of Pembroke and Anne Devereux.
His father was previously married to Anne Woodville, a daughter of Richard Woodville, 1st Earl Rivers and Jacquetta of Luxembourg.
His only known paternal half- brother was Richard Grey, 3rd Earl of Kent.
Richard succeeded their father as Earl of Kent but wound up heavily in debt, probably through gambling, and was forced to alienate most of his property.
A good part ended up in the crown's hands; historians disagree regarding what this says about the relationship of Henry VII of England with the aristocracy.
When Richard died childless, Henry inherited the title of Earl of Kent and what was left of the associated property.
Henry tried, with little success, to reacquire the property Richard had sold, and had to live as a modest gentleman, never formally taking title as earl.
He married Anne Blennerhassett daughter of John Blennerhassett and Jane Higham.
They had two children:
Margaret Wake, 3rd Baroness Wake of Liddell
Margaret Wake," suo jure" 3rd Baroness Wake of Liddell and Countess of Kent( c. 1297 – 19 September 1349) was the wife of Edmund of Woodstock, 1st Earl of Kent, the youngest surviving son of Edward I of England and Margaret of France.
Anthony Grey, 9th Earl of Kent
Rev. Anthony Grey (1557 – 9 November 1643) was Earl of Kent from 1639 to his death.
He was a son of George Gray by Margery, daughter of Gerard Salvaine of Croxdale.
George was the apparently only son of Anthony Gray of Brancepeth, a son of George Grey, 2nd Earl of Kent, by his second wife Katherine (or Katharine or Catherine), daughter of William Herbert, 1st Earl of Pembroke.
In 1639, Gray succeeded his childless second cousin once removed Henry Grey, 8th Earl of Kent.
Henry was a great-grandson of Henry Grey, 4th Earl of Kent, another son of the 2nd Earl.
A priest in the Church of England, Gray was rector at Aston Flamville and later Burbage.
Edmund Grey, 1st Earl of Kent
Edmund Grey, 1st Earl of Kent (26 October 141622 May 1490), English administrator, nobleman and magnate, was the son of Sir John Grey, KG and Constance Holland.
His main residence was at Wrest near Silsoe, Bedfordshire.

Question: Who is Edmund Grey, 1St Earl Of Kent's paternal grandfather?
Answer: Reginald Grey, 3rd Baron Grey de Ruthyn