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William de Vivonia (de Fortibus)
- 1259(
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- 1 William de Vivonia (de Fortibus) [1] d. 1259
- Maud de Ferrers
- 2 Joan de Vivonia [1.1]
- Reginald Fitz Piers
- 3 Lucy Fitz Piers [1.1.1]
- Sir William de Ros
- 4 Sir William de Ros [1.1.1.1]
[ =>]
- 4 Sir William de Ros [1.1.1.1]
- 3 Lucy Fitz Piers [1.1.1]
- 2 Joan de Vivonia [1.1]