Family: William Montagu, 3rd Baron Montagu / Catherine De Grandison (F936)
m. 1320
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 | William De Montagu, 2nd Baron Montagu  (1275-1319)
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 | Elizabeth De Montfort, Baroness Montagu  (1275-1354)
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| Alice Montagu, Baroness (1311-1346)  |
| William De Grandison, 1st Baron Grandison (1262-1335) |
| Sibyl De Tregoz (1265-1334)
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| Mabel De Grandison (1294-1349) |
| William Montagu, 3rd Baron Montagu (1301-1344)
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| Catherine De Grandison (1304-1349)
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| John Montagu (1328-1389) |
| Sybil Montagu (1332-1354) |
| Philippa De Montacute, Countess Of March (1332-1381) |