Family: 1st Duke Of Lancaster John Plantagenet / Duchess Of Lancaster Katherine De Roet (F1071)
m. 19 May 1359
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 | King of England Edward Plantagenet (1312-1377)
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 | Queen of England Phillipa D'Avesnes Of Hainault (1314-1369)
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 | Duke of Clarence Lionel of Antwerp (1338-1368)  |
| 1st Duke of York Edmund of Langley (1341-1402) |
| 1st Duke of Gloucester Thomas of Woodstock (1355-1397) |
| Paon De Roet (1310-1403)
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| Catherine Davesnes (1320-1375)
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| 1st Duke Of Lancaster John Plantagenet (1340-1399)
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| Duchess Of Lancaster Katherine De Roet (1350-1403)
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 | King of England Henry Plantagenet, IV (1367-1413) |
 | Countess of Westmorland Joan Beaufort (1375-1440) |