Nielsen Hayden genealogy
Family: Henry Percy / Margaret de Neville (F11212)
m. 12 Jul 1358Henry de Percy (1322-1368) 
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Mary of Lancaster (1320-1362)
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| Ralph de Neville (1291-1367)
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| Alice de Audley (1300-1374)
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John de Neville (1330-1388)  |
| Henry Percy (1341-1408)
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| Margaret de Neville ( -1372)
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| Henry "Hotspur" Percy (1364-1403) |