| | | | | | | | | | | | King Edward the 1st "Longshanks" PLANTAGENET 1239 - 1307
  | Margaret of FRANCE ? - 1317
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| | | | Stephen de SEAGRAVE
 | ? | Earl of Norfolk Thomas PLANTAGENET 1300 - 1335
  | Alice HALYS ? - 1330
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Stephen de SEAGRAVE
 | ? | John de SEGRAVE 1315 - 1353
  | Margaret PLANTAGENET 1320 - 1400
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John de MOWBRAY 1340 - 1368
  | Elizabeth de SEGRAVE
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Duke of Mowbray Thomas de MOWBRAY 1366 - 1399
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Partners | Child/Children |
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Elizabeth FITZALAN (? - 1425) | Margaret de MOWBRAY 
| Elizabeth LE STRANGE | |
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