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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:

• Mary Grey (1440–1474);
• Anthony Grey (1446–1480), married Eleanor Woodville, daughter of Richard Woodville, 1st Earl Rivers;
• Elizabeth Grey (d. 1472), married Sir Robert Greystoke;
• Anne Grey (b. 1450), married John Grey, 8th Baron Grey de Wilton;
• George Grey, 2nd Earl of Kent (1454–1505), married Anne Woodville;
• John Grey (1455–1484);
• Edmund Grey (b. 1457).

• Profile, Tudorplace.com. Accessed 7 January 2023.

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