Family: Pierre Mauclerc de DREUX, Duke of Brittany / Alice de THOUARS (F8527)
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 | Robert II de DREUX, Comte de Braine et de Dreux (1154-1218) |
 | Yolande de COUCY (1164-1222)
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| Robert III de DREUX, Comte de Dreux (1185-1234) |
| Eleanor de DREUX (1190- )  |
| Philippe de DREUX (1192-1242) |
| Guy, Viscount De Thouars (1155-1213)
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| Constance, Duchess of Brittany (1161-1201)
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| Katherine de THOUARS (1201- ) |
| Pierre Mauclerc de DREUX, Duke of Brittany (1187-1250)
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| Alice de THOUARS (1201-1221)
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| Yolande de DREUX, of Bretagne (1218-1272) |
| John de DREUX, Duke of Brittany (1220-1286) |