_Geoffrey V PLANTAGENET ___+
                                                             | (1113 - 1151)             
                                      _Henry II PLANTAGENET _|
                                     | (1132 - 1189) m 1152  |
                                     |                       |_Matilda of NORMANDY ______+
                                     |                         (1101 - 1167)             
 _Geoffrey II PLANTAGENET ___________|
| (1158 - 1186)                      |
|                                    |                        _William X POITIERS _______+
|                                    |                       | (1099 - 1137)             
|                                    |_Eleanor of POITIERS __|
|                                      (1122 - 1204) m 1152  |
|                                                            |_Aénor of CHÂTELLERAULT _+
|                                                              (1103 - 1129)             
|
|--Arthur of Brittany PLANTAGENET 
|  (1187 - 1203)
|                                                             ___________________________
|                                                            |                           
|                                     _______________________|
|                                    |                       |
|                                    |                       |___________________________
|                                    |                                                   
|_Constance of Brittany PENTHIÈVRE _|
  (1161 - 1201)                      |
                                     |                        ___________________________
                                     |                       |                           
                                     |_______________________|
                                                             |
                                                             |___________________________