_Roger IV of FOIX ________+
                                                   | (.... - 1264)            
                       _Roger-Bernard III of FOIX _|
                      | (1243 - 1301) m 1252       |
                      |                            |_Brunissenda of CARDONA __
                      |                                                       
 _Gaston I of FOIX ___|
| (1287 - 1315)       |
|                     |                             __________________________
|                     |                            |                          
|                     |_Margaret of BEARN _________|
|                       (1245 - 1319) m 1252       |
|                                                  |__________________________
|                                                                             
|
|--Gaston II FOIX 
|  (1308 - 1343)
|                                                   _Robert II of ARTOIS _____+
|                                                  | (1250 - 1302)            
|                      _Philip of ARTOIS __________|
|                     | (1269 - 1298) m 1281       |
|                     |                            |_Amicie of COURTENAY _____+
|                     |                              (.... - 1275)            
|_Joan of ARTOIS _____|
  (1289 - 1349)       |
                      |                             _John II of DREUX ________+
                      |                            | (1238 - 1305)            
                      |_Blanche of DREUX __________|
                        (1271 - 1327) m 1281       |
                                                   |_Beatrice of PLANTAGENET _+
                                                     (1242 - 1274)