Edmund of Langley, 1st Duke of York Children    Edward of Norwich, 2nd Duke of York    Richard of Conisburgh, Earl of Cambridge    Constance, Countess of Gloucester Edward of Norwich, 2nd Duke of York Richard of Conisburgh, Earl of Cambridge Children    Isabel, Countess of Essex    Richard Plantagenet, 3rd Duke of York Richard Plantagenet, 3rd Duke of York Children    Anne, Duchess of Exeter    Edward IV of England    Edmund, Earl of Rutland    Elizabeth, Duchess of Suffolk    Margaret, Duchess of Burgundy    George, Duke of Clarence    Richard III of England Edward IV of England Children    Elizabeth, Queen Consort of England    Mary of York    Cecily Kymbe    Edward V of England    Margaret of York    Richard of Shrewsbury, Duke of York    Anne, Countess of Surrey    George, Duke of Bedford    Catherine, Countess of Devon    Bridget of York George, Duke of Clarence Children    Margaret, Countess of Salisbury    Edward, Earl of Warwick Richard III of England Children    Edward of Middleham, Prince of Wales

Isabel Plantagenet (1409-2 October 1484) was the only daughter of Richard of Conisburgh, 3rd Earl of Cambridge and Anne de Mortimer. She was an older sister of Richard Plantagenet, 3rd Duke of York and, like him, simultaneously a great-grandchild (through their father) and a great-great-great grandchild (through their mother) of Edward III.

On 18 February 1413 she was either betrothed or married to Sir Thomas Grey. He was a namesake son of Sir Thomas Grey and Lady Alice Neville, daughter of Ralph Neville, 1st Earl of Westmorland and Margaret Stafford.

The engagement would presumably have been negated with the execution of her father for treason in 1415. Richard had been stripped of all his titles and estates by Henry V of England and his daughter was effectively disinherited.

She is known to have married Henry Bourchier, 1st Earl of Essex at some point prior to 1426. They were parents to at least eleven children.

• William Bourchier, Viscount Bourchier (d. 1480). Married Anne Woodville, daughter of Richard Woodville, 1st Earl Rivers and Jacquetta of Luxembourg. They were parents of Henry Bourchier, 2nd Earl of Essex and Hon. Cecily Bourchier.
• Henry Bourchier (d. 1462). Married Elizabeth Scales, 8th Baroness Scales.
• Humphrey Bourchier, 1st Baron Cromwell (d. April 14, 1471). Killed in the Battle of Barnet.
• John Bourchier (d. 1495). Married first Elizabeth Ferrers and secondly Elizabeth Chichelle.
• Edward Bourchier (d. December 30, 1460). Killed in the Battle of Wakefield.
• Thomas Bourchier (b. prior to 1448 d. 1492). Married Isabella Barre.
• Florence Bourchier (d. 1525).
• Fulk Bourchier. Considered to have died young.
• Hugh Bourchier. Considered to have died young.
• Isabella Bourchier. Considered to have died young.
• Laura Bourchier. (b.1440) Married John Earl of Devon

Her husband died on 4 April 1483. She remained a widow and died more than a year later. She was buried in Maldon, Essex.

External links

• A pedigree of the Bourchier family.
• Her profile in Peerage.com

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