Lady Katherine Percy (May 18 1423 – c. 1475) 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: Mary Grey (1440–1474) Anthony Grey (1446–1480) Elizabeth Grey (d. 1472) married Sir Robert Greystoke Anne Grey (b.
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