Family: John Saint John, 1st Baron St John of Basing / Isabell De Courtenay (F1471)
m. Abt 1307
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 | John St. John, Lord St. John  (1235-1302)
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 | Alice Fitzpiers (1234-1305)
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| Hugh De Courtenay (1251-1292)
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| Eleanor Le Despencer (1259-1328)
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| John Saint John, 1st Baron St John of Basing (1273-1329)
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| Isabell De Courtenay (1283-1325)
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| Margaret De St. John (1304-1361)  |