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8 | | John de BRITTANY II Duke of Brittany | => |
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 | B: | 03 JAN 1239 |
| P: | of Nantes, Brittany, France |
| M: | 22 JAN 1258 |
| 4 | | Arthur de Britanny II Duke of Brittany | P: | St. Denis, Seine-St Denis, France |
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 | B: | 25 JUL 1262 | | D: | 18 NOV 1305 |
| P: | Rennes, Brittany, France | P: | Lyon, Rhone, France |
| M: | MAY 1294 |
| P: | | 9 |  | Beatrice PLANTAGENET Princess of England | => |
| |  |
| D: | 27 AUG 1312 |  | B: | 25 JUN 1242 |
| P: | | P: | Bordeaux, Aquitaine, France |
| D: | 24 MAR 1274 |
| P: | London, Middlesex, England |
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| 2 | | John de Montfort III Duke of Brittany | | 10 | | Robert de Dreux IV Count of Dreux and Braine | => |
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 | B: | ABT 1294 | |  | B: | ABT 1241 |
| P: | Normandy, France | P: | of Dreux, Eure-et-Loire, France |
| M: | | M: | 1259 |
| P: | | 5 |  | Yolande de Dreux | P: | |
|  | |
| D: | 1375 |  | B: | ABT 1263 | | D: | 14 NOV 1284 | |
| P: | | P: | of Dreux, Eure-et-Loire, France | P: | |
| D: | 1322 | |
| P: | | 11 |  | Beatrix de Montfort | => |
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|  | B: | ABT 1249 |
| P: | Montfort-l'Amaury Castle, Ile-de-France, France |
| D: | 09 MAR 1311 |
| P: | |
| 1 | John de Montfort IV KG Duke of Brittany | |
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 | B: | ABT 1339 | | | | | 12 | | | |
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| P: | Nantes, Loire-Atlantique, Franc |  | B: | |
| D: | 01 NOV 1399 | P: | |
| P: | Nantes, Loire-Atlantique, Franc | M: | |
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