Conan IV "La Petit" Duke of Brittany
- 1171
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| Eleanor of Anjou | |
| B: | 1184 |
| D: | 10 Aug 1241 |
| Matilda Anjou | |
| B: | Abt 1185 |
| D: | Yes, date unknown |
| Arthur (Duke of Brittany) Plantagenet | |
| B: | 29 Mar 1187 |
| Nantes, Brittany | |
| D: | 3 Apr 1203 |
| Killed By His Uncle King John | |
| Daughter of Tancred King of Sicily | |
| M: | Oct 1190 |
| D: | Yes, date unknown |
| Constance Duchess of Brittany | |
| B: | Abt 1161 |
| D: | 5 Sep 1201 |
| Nantes, Brittany | |
| Geoffrey II Duke of Brittany | |
| B: | 23 Sep 1158 |
| M: | Jul 1181 |
| D: | 19 Aug 1186 |
| Paris | |
| Ranulph (4th Earl of Chester) De Blundeville | |
| B: | Aft 1172 |
| M: | 3 Feb 1186-1187 |
| D: | 1232 |
| John The Red (Duc Le Roux) Duke of Brittany | |
| D: | 1286 |
| Blanche of Navarre | |
| B: | 1226 |
| D: | 11 Aug 1283 |
| Yolande (De Bretagne) De Dreux | |
| B: | 1218 |
| D: | 1272 |
| Hugh XI (Count of Mar & Angoul?me) De Lusignan | |
| M: | 1235 |
| D: | 1250 |
| Alice (Duchess of Brittany) De Thouars | |
| B: | 1201 |
| D: | 1221 |
| Pierre I Mauclerc of Brittany Count De Dreux | |
| B: | Abt 1189 |
| M: | 1213 |
| D: | 22 Jun 1250 |
| Katherine De Thouars | |
| B: | 1201 |
| D: | Yes, date unknown |
| Andrew (of Brittany) De Vitre | |
| D: | Yes, date unknown |
| Guy Viscount De Thouars | |
| M: | 1199 |
| Angers, Anjou | |
| D: | 1213 |
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| Conan IV "La Petit" Duke of Brittany | |
| D: | 20 Feb 1170-1171 |
| Margaret (Countess of Hereford) of Huntingdon | |
| D: | 1201 |
| Sawtrey Abbey Hants. | |