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) . William I of England (1027-1087), Henry II of England (1133-1189), Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Henry II of England (1133-1189)/s, Hugh Capet (c940-996)/s, William I of England (1027-1087)/s, Rollo of Normandy (860-932)/s.
|Offspring of Henry Percy, 1st Earl of Northumberland and Margaret Neville (1329-1372)|
|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-)|