_Roger-Bernard III of FOIX _+
                                                  | (1243 - 1301) m 1252       
                             _Gaston I of FOIX ___|
                            | (1287 - 1315)       |
                            |                     |_Margaret of BEARN _________
                            |                       (1245 - 1319) m 1252       
 _Roger-Bernard IV of FOIX _|
| (1310 - 1350)             |
|                           |                      _Philip of ARTOIS __________+
|                           |                     | (1269 - 1298) m 1281       
|                           |_Joan of ARTOIS _____|
|                             (1289 - 1349)       |
|                                                 |_Blanche of DREUX __________+
|                                                   (1271 - 1327) m 1281       
|
|--Roger-Bernard V of FOIX 
|  (1330 - 1381)
|                                                  ____________________________
|                                                 |                            
|                            _____________________|
|                           |                     |
|                           |                     |____________________________
|                           |                                                  
|_Constance of LUNA ________|
  (.... - 1353)             |
                            |                      ____________________________
                            |                     |                            
                            |_____________________|
                                                  |
                                                  |____________________________