Nielsen Hayden genealogy
Family: John de Montagu / Margaret Monthermer (F10305)
William de Montagu (1302-1344) 
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Katherine de Grandison ( -1349)
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Philippe de Montagu ( -1382)  |
| Thomas de Monthermer (1301-1340)
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| Margaret de Brewes (1303-1349)
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| John de Montagu (1329-1390)
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| Margaret Monthermer (1329-1395)
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| John Montagu (1351-1400) |
| Eleanor Montagu (1364-1393) |