_Archambaud GRAILLY ______
                                                 | (1330 - 1412)            
                           _John I FOIX _________|
                          | (1382 - 1436) m 1422 |
                          |                      |_Isabella of FOIX ________+
                          |                        (1361 - 1428)            
 _Gaston IV FOIX _________|
| (1422 - 1472)           |
|                         |                       __________________________
|                         |                      |                          
|                         |_Jeanne of ALBRET ____|
|                            m 1422              |
|                                                |__________________________
|                                                                           
|
|--Gaston FOIX 
|  (1445 - 1470)
|                                                 _Ferdinand I TRASTÁMARA _+
|                                                | (1380 - 1416)            
|                          _John II TRASTÁMARA _|
|                         | (1398 - 1478)        |
|                         |                      |_Eleanor of IVREA ________+
|                         |                        (1374 - 1435)            
|_Eleanor of TRASTÁMARA _|
  (1425 - 1478)           |
                          |                       _Charles III ÉVREUX _____+
                          |                      | (1361 - 1425)            
                          |_Blanche of ÉVREUX __|
                            (1387 - 1441)        |
                                                 |_Eleanor of TRASTÁMARA __+
                                                   (1363 - 1415)