Isabel of Cambridge, Countess of Essex

Isabel of Cambridge
Countess of Essex
Remains of Beeleigh Abbey, first burial place of Isabel of York
Born	1409
Died	2 October 1484 (aged 74–75)
Burial	Beeleigh Abbey, Little Easton, Essex
Spouse	Sir Thomas Grey Henry Bourchier, 1st Earl of Essex
Issue	William Bourchier, Viscount Bourchier Sir Henry Bourchier Humphrey Bourchier, 1st Baron Cromwell John Bourchier Sir Thomas Bourchier Edward Bourchier Fulk Bourchier Isabel Bourchier
House	York
Father	Richard, 3rd Earl of Cambridge
Mother	Anne Mortimer

Isabel of Cambridge, Countess of Essex (1409 – 2 October 1484) was the only daughter of Richard, 3rd Earl of Cambridge and Anne Mortimer. She was the sister of Richard Plantagenet, 3rd Duke of York, and like him a great-grandchild of Edward III of England.

Isabel of York, the only daughter of Richard of Conisburgh, 3rd Earl of Cambridge, and Lady Anne de Mortimer, was born about 1409. Through her father, she was the granddaughter of King Edward III's fourth surviving son, Edmund of Langley, 1st Duke of York, and his first wife, Isabella of Castile. Her mother was the daughter of Roger Mortimer, 4th Earl of March (grandson of Lionel of Antwerp) and Lady Alianore Holland (granddaughter of Lady Joan of Kent, Princess of Wales).

Isabel's father, Richard, Earl of Cambridge, was beheaded on 5 August 1415 for his part in the Southampton Plot against King Henry V, and although the Earl's title was forfeited, he was not attainted, and Isabel's brother, Richard, then aged four, was his father's heir. Moreover, within a few months of his father's death, Richard's childless uncle, Edward of Norwich, 2nd Duke of York, was slain at the Battle of Agincourt on 25 October 1415, and Isabel's brother was eventually his uncle's heir as well.