Family: Lord De Fortibus William De Vivonne / Maud De Ferrers (F1430)
m. 1252
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 | Sibyl Marshal (1201-1245) |
 | Lord De Fortibus William De Vivonne (1225-1259) |
| Maud De Ferrers (1228-1299)
|
| Cicely De Vivonne (1253-1319)  |