Ursula Plantagenet, of York

A daughter of Richard of York and Cecily Neville: "Described as the youngest child, she was born on 22 July, 1455, at Fotheringhay Castle, Northants and died young."
Source: Weir, Allison. Britain's Royal Families: The Complete Genealoty (London: Vintage Books. Kindle Edition, 1989). 139.

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Born and died in "Fotheringhay, Northamptonshire, England"
Buried in "St Mary the Virgin and All Saints Churchyard" in Fotheringhay
"Daughter of Sir Richard Plantagenet and Cecily de Neville, grandson of Sir Richard of York and Anne de Mortimer, Sir Ralph de Neville and Joan de Beaufort." [https://www.findagrave.com/memorial/108239077/ursula-plantagenet]

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Ursula Plantagenet
F[emale]
No.101641
b. 22 July 1455
"Ursula Plantagenet was born on 22 July 1455 at Fotheringhay Castle, Fotheringhay, Northamptonshire, EnglandG.[1] She was the daughter of Richard Plantagenet, 3rd Duke of York and Lady Cecily Neville. She died, young.[1]" [http://www.thepeerage.com/p10165.htm]