Family: John De Montagu, Lord / Margaret De Monthermer, Baroness (F1012)
m. 1343
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 | William De Montagu, 1st Earl of Sali (1302-1343)
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 | KATHERINE DE GRANDISON (1304-1349)
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| Elizabeth Montacute (1325- ) |
| William De Montagu, Kg, 2Nd Earl Of Salisbury (1328-1397)  |
| Anne Montacute (1330- ) |
| PHILIPPA MONTAGU, COUNTESS MARCH (1332-1382) |
| Sibyl Montacute (1334- ) |
| Sibyl De Montagu (1330- ) |
| Thomas 2nd Baron de Monthermer, , Sir (1301-1340)
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| Margaret DE Tibetot (1303-1349)
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| John De Montagu, Lord (1327-1390)
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| Margaret De Monthermer, Baroness (1329-1395)
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| John De Montagu, Marshal England (1350-1399) |
| Thomas De Montagu (1388- ) |