| | | | | | | | KIng Henry III PLANTAGENET 1206 - 1272
  | Eleanor Countess of PROVENCE 1223
  | Phillip III of FRANCE
 | Maria of BRABANT
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| | | | 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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John de SEGRAVE 1315 - 1353
  | Margaret PLANTAGENET 1320 - 1400
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Elizabeth de SEGRAVE
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Partners | Child/Children |
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John de MOWBRAY (1340 - 1368) | Margaret de MOWBRAY (1361 - 1404) Joan de MOWBRAY (1363) Eleanor de MOWBRAY (1364) Duke of Mowbray Thomas de MOWBRAY (1366 - 1399) John de MOWBRAY 
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