This lady, although the only sister of Richard, Duke of York, is arguably the least-known of all the members of the House of York who managed to grow up. Therefore a few notes about here are perhaps not out of place.

Isabel was of course the daughter of Richard of Conisbrough and Anne Mortimer and appears to have been born in the early years of their marriage, round about 1408 or 1409. (This assumes they didn’t consummate their marriage until it was legitimised (1408). Since the detail of how they married, and when, is shrouded in mystery, it’s possible Isabel was a little older.) She was ‘married’ to Thomas Grey of Heton in 1412 as part of what appears to have been a deal to transfer the Lordship of Tyndale (then the property of Edward, Duke of York, her uncle) to Grey’s father. Due to the treasonable conspiracy of Richard of Conisbrough, Earl of Cambridge and the elder Grey (the Southampton Plot) this (marriage) arrangement was dissolved and Isabel was instead married (circa 1430) to Henry Bourchier, Earl (or Count) of Eu and later Earl of Essex.

Henry was the son of Sir William Bourchier and Anne of Gloucester, the extremely rich daughter and heiress of Thomas of Woodstock, Duke of Gloucester. (Anne was of course Richard of Conisbrough’s first cousin. As well as being her father’s heiress she had two dowers from the Stafford family, having married successive earls. She would make an interesting subject for a novel if anyone out there fancies writing one for her.)

The children of Henry and Isabel were:

William, who married Anne Woodville (or Wydeville or Widville). She was (need I say?) the sister of Queen Elizabeth Woodville. He died in April 1483. His son, also William, succeeded as Earl of Essex and lived long enough to serve at Anne Boleyn’s coronation.

Henry, who married Elizabeth Scales, an heiress. After he died in August 1458 she married the well-known Anthony Woodville/Wydeville/Widville, later Earl Rivers.

Humphrey, who married Joan Stanhope, and was styled Baron Cromwell in her right. He was killed at the Battle of Barnet (1471) fighting for the Yorkists. Joan remarried, Sir Robert Radcliffe.

John, who married Elizabeth Ferrers of Groby and in her right assumed the title Lord Ferrers of Groby, though never summoned to parliament. He had a ‘prolonged’ law suit with Elizabeth Woodville over the Groby lands. His second wife was Elizabeth Chicheley of Cambridgeshire. He died 1495.

Thomas married Isabelle Barre, widow of Henry Stafford of Southwick the (Yorkist) Earl of Devon. After her death (1489) he married Anne, widow of Sir John Sulyard. He was Constable of Leeds (Kent) and was on a commission to investigate treason in Kent in December 1483. He died in 1491.

Isabel, the only daughter. Died apparently unmarried.

Edward, died 31 December 1460. (Battle of Wakefield)

Fulk, died young.

Essex was a ‘backroom boy’ for the Yorkists, occupying various offices without apparently becoming prominent in government or unpopular with Warwick or other hostile elements. He died peacefully in 1483. Nonetheless it’s worth noting that the wars cost him two of his sons killed in action! His brother, Thomas, was of course Archbishop of Canterbury through the Yorkist period and a little beyond. (Their half-brother on their mother’s side was no less a person than Humphrey Stafford, first Duke of Buckingham.)

Isabel herself died in 1484, during Richard III’s reign. She was therefore in her early seventies, and so unusually long-lived for a member of the York family, even allowing for the tendency of the York males to have their lives cut short by violence. (In fact the only adult males of the House of York to die in their beds were Edmund of Langley and Edward IV. The rest either died in battle or were executed!) Isabel would certainly have had some interesting tales to tell about her days and it’s a pity that no roving reporter was around to interview her.


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3 responses to “Isabel Plantagenet 1408(?)-1484”

  1. Very interesting. I must confess that I had overlooked the fact that Richard of York even had a sister, so thanks for posting the article. You are right, her story would make a fascinating novel.

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  2. […] Isabel Mylbery is quite obscure. The earliest evidence we have is from about 1510. Garter King-at-Arms recorded that she was ‘educata ut fert[ur] pre Regem E[dwardum] iiij’ which means, roughly, that she was brought up by Edward IV. She also bore lions and white roses in her coat of arms. None of this is remotely conclusive (only DNA evidence would give us certainty) but taken together it is suggestive. It might also be added that ‘Isabel’ was a Yorkist name of long-standing, borne by the King’s great-great-grandmother, Isabella of Castile, and by his great-aunt, Isabel, Lady Essex. […]

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  3. […] 1415 and great-great-nephew of Richard, the Archbishop of York who was beheaded in 1405 after the Northern Rising. The title eventually passed into abeyance in 1517 as Thomas and his three brothers left no male […]

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