| Male William de Montagu |
| Birth | 1302 | Cassington, Oxfordshire, England |
| Death | 30 Jan 1343 | Windsor Castle, Berkshire, England![]() Windsor Castle, Berkshire, England |
| Burial | Bisham, Berkshire, England |
|
| Marriage | 1327 | England |
| Father | William de Montagu, Baron Montagu | F6048 Group Sheet | |
| Mother | Elizabeth de Montfort | F6048 Group Sheet | |
| Female Katherine de Grandison |
| Birth | Abt 1304 | Ashford, Kent, England |
| Death | 23 Nov 1349 | Bisham, Berkshire, England |
| Burial | ||
| Father | William de Grandison, Lord Grandison | F5565 Group Sheet | |
| Mother | Sybil Tregoz | F5565 Group Sheet | |
| Male + John de Montagu |
| Birth | ||
| Death | 25 Feb 1389 | England |
| Burial | Salisbury Cathedral, Salisbury, Wiltshire, England![]() Salisbury Cathedral, Salisbury, Wiltshire, England |
|
| Spouse | Margaret de Monthermer | F6044 | |
| Marriage | 2 Jul 1340 | |
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