Family: Pierre I Mauclerc of Brittany Count De Dreux / Alice (Duchess of Brittany) De Thouars (F41661)
m. 1213
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 | Robert II Count De Dreux (1154-1218)
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 | Yolande De Coucy ( -1222)
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| Robert III Counte De Dreux (1185-1234)  |
| Adeliade De Dreux (1189-1258) |
| Agnes De Dreux (1195-1258) |
| Philippa De Dreux (1192-1240) |
| Yolande De Dreux ( -1238) |
| Guy Viscount De Thouars ( -1213)
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| Constance Duchess of Brittany (1161-1201)
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| Katherine De Thouars (1201- ) |
| Pierre I Mauclerc of Brittany Count De Dreux (1189-1250)
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| Alice (Duchess of Brittany) De Thouars (1201-1221)
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| Yolande (De Bretagne) De Dreux (1218-1272) |