Henry Percy, 1st Earl of Northumberland, was born 10 November 1341 in England, United Kingdom to Henry de Percy, 3rd Baron Percy (1320-1368) and Mary of Lancaster (c1320-1362) and died 20 February 1408 Battle of Bramham Moor of killed in action. He married Margaret Neville (1329-1372) .
Children
| Name | Birth | Death | Joined with |
| Ralph Percy (c1359-1397) | |||
| Henry Percy (c1363-1403) | 20 May 1364 Alnwick Castle, Alnwick, Northumberland, England, United Kingdom | 21 July 1403 Shrewsbury, Shropshire, England, United Kingdom | Elizabeth Mortimer (1371-1417) |
| Thomas Percy (c1366-1388) | |||
| Margaret Percy (1368-) | |||
| Alan Percy (1372-) | |||
Footnotes (including sources)
| ‡ General |