KL DeWitt Genealogy Research Project
Our Family's Journey Through Time from Europe and Canada to the USA
 MaleHenry Percy, 1st Earl of Northumberland 4th Baron Percy King of Mann KG Lord Marshal |
| Birth | 10 Nov 1341 | |
| Death | 20 Feb 1408 | |
| Burial | ||
| Marriage | ||
| Father | Henry Percy, 3rd Baron Percy of Alnwick Warden of the Marches High Sheriff of Northumberland | F6539 Group Sheet | |
| Mother | Mary Plantagenet of Lancaster, Baroness Percy | F6539 Group Sheet | |
 FemaleMargaret Neville, Baroness Ros of Helmsley Countess of Northumberland |
| Birth | 12 Feb 1329 | |
| Death | 12 May 1372 | |
| Burial | ||
| Other Spouse | William Ros, 3rd Baron Ros of Helmsley | F7243 | |
| Marriage | ||
| Father | Ralph Neville, 2nd Baron Neville de Raby | F4321 Group Sheet | |
| Mother | Alice Audley, Baroness Greystoke Baroness Neville de Raby | F4321 Group Sheet | |
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