| b 1303, , Cassington, Oxfordshire, England | ||||
| d 30 Jan 1343, , Windsor Castle, Berkshire, England | bur , Bisham, Berkshire, England | William De_Montacute | ||
| Simon De Montagu, [Baron Montagu] | b 1210 | |||
| | b 1250 | Beota | |||
| William De Montagu, [Baron Montagu] | d 26 Sep 1316 | b 1212 | ||
| |b 1275 | | | Amauri De Saint_Amand | ||
| |d 18 Oct 1319 | Hawaise De Saint_Amand | b 1211 | ||
| | | b 1252 | Mrs-Amauri De Saint_Amand | ||
| William De Montagu, [earl Of Salisbu | d 1287 | b 1213 | Thurstan De Montfort | > |
| |Katherine De Grandison | Peter De Montfort | |m 1327 | Peter De Montford | b 1220 | Henry Aldithley |
| |Of, Cassington, Oxfordshire, England | |b 1230 | Alice De Aldithley | ||
| Elizabeth De Montfort, [Baroness] | d 1287 | b 1225 | ||
| b 1271 | | | John De Warr | ||
| d 1345 | Matilda De La Warr | b 1216 | ||
| b 1242 | ||||