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From the Wikipedia page [1]

Lady Katherine Percy (18 May 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:

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